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Thread: Different external IP address for different "show my IP" pages!!!

  1. #1
    Elton
    Guest

    Different external IP address for different "show my IP" pages!!!

    Hi!
    I have a DSL connection with dynamic IP.
    My problem is that it seems that different pages that show my external
    IP, display different results.
    For example:
    showip.net shows X.Y.Z.84
    showmyip.com.ar shows X.Y.Z.86
    mediacollege.com/internet/utilities/show-ip.shtml shows X.Y.Z.3
    whatismyip.com shows X.Y.Z.116
    showmyip.com shows X.Y.Z.3 (this time is the same
    result as one of the pages above)
    the No-IP DUC shows X.Y.Z.84

    Of course the X Y Z don't change.
    So it seems like for different pages or requests my ISP assigns me
    different IPs or something, I don't really understand it.

    Initially I wanted to make my home computer a small web server (nginx
    listening on port 6789) that could be accessible from the
    internet and since my IP is dynamic I tried DYNDNS (with no result)
    and now No-IP (with no result, too).
    I added the correct entries for port forwarding in Advanced -> NAT ->
    Virtual Server in my ZTE ZXDSL 831II modem/router (fireware version
    ZXDSL 831IIV7.5.0a_Z29_AL1) but still couldn't access my web server
    neither from the DynDNS host or the No-IP host, so I slowly am giving
    up to the idea of running a web server in my home pc.

    But I still am curious to learn more about networks and to understand
    why the above problem (the different WAN IPs problem) happens!

    So why does that happen?
    Is it some kind of technique used by ISPs to distribute requests or
    something?!?!?

  2. #2
    Kerry Liles
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    "Elton" <eltoni.91@gmail.com> wrote in message
    news:5f636256-31a3-428c-89e0-ae3dcbe3b86c@g10g2000vbc.googlegroups.com...
    > Hi!
    > I have a DSL connection with dynamic IP.
    > My problem is that it seems that different pages that show my external
    > IP, display different results.
    > For example:
    > showip.net shows X.Y.Z.84
    > showmyip.com.ar shows X.Y.Z.86
    > mediacollege.com/internet/utilities/show-ip.shtml shows X.Y.Z.3
    > whatismyip.com shows X.Y.Z.116
    > showmyip.com shows X.Y.Z.3 (this time is the same
    > result as one of the pages above)
    > the No-IP DUC shows X.Y.Z.84
    >
    > Of course the X Y Z don't change.
    > So it seems like for different pages or requests my ISP assigns me
    > different IPs or something, I don't really understand it.
    >
    > Initially I wanted to make my home computer a small web server (nginx
    > listening on port 6789) that could be accessible from the
    > internet and since my IP is dynamic I tried DYNDNS (with no result)
    > and now No-IP (with no result, too).
    > I added the correct entries for port forwarding in Advanced -> NAT ->
    > Virtual Server in my ZTE ZXDSL 831II modem/router (fireware version
    > ZXDSL 831IIV7.5.0a_Z29_AL1) but still couldn't access my web server
    > neither from the DynDNS host or the No-IP host, so I slowly am giving
    > up to the idea of running a web server in my home pc.
    >
    > But I still am curious to learn more about networks and to understand
    > why the above problem (the different WAN IPs problem) happens!
    >
    > So why does that happen?
    > Is it some kind of technique used by ISPs to distribute requests or
    > something?!?!?



    I presume you ran all those external IP pages more or less around the same
    time of course? Even if your dhcp lease time was small (say 10 minutes??)
    your lease should auto-renew at 50% of the time and unless your ISP is
    running some sort of weird dhcp server, you would expect to renew a dhcp
    lease not get a new IP. If your IP is changing that often, I would be
    surprised if you didn't notice other problems - especially with streaming
    data like video or audio and the like...

    Can you access your router config and see (from it) what your external IP
    address is (and then check it every minute or so for a while? My router is
    set to get my external IP from the ISP (via cable modem) and on the "Wan
    setup" page(s) I can see what my external IP is (and for that matter, the
    length of the dhcp lease too)




  3. #3
    Elton
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    > I presume you ran all those external IP pages more or less around the same
    > time of course? Even if your dhcp lease time was small (say 10 minutes??)
    > your lease should auto-renew at 50% of the time and unless your ISP is
    > running some sort of weird dhcp server, you would expect to renew a dhcp
    > lease not get a new IP. If your IP is changing that often, I would be
    > surprised if you didn't notice other problems - especially with streaming
    > data like video or audio and the like...
    >


    Yes they were run on the same time.
    Never had problems with streaming data (if by that you mean Youtube,
    Video Conferencing, Skype, Live Messenger Video Conference, etc).

    > Can you access your router config and see (from it) what your external IP
    > address is (and then check it every minute or so for a while? My router is
    > set to get my external IP from the ISP (via cable modem) and on the "Wan
    > setup" page(s) I can see what my external IP is (and for that matter, the
    > length of the dhcp lease too)


    I opened my ZTE ZXDSL modem/router's web interface and at Status ->
    Internet Connection this table shows up:

    PVC Name VPI/VCI Category Protocol NAT WAN IP Address Status /

    pppoe_8_35 8/35 UBR PPPoE On 10.101.241.239 Up


    So I think 10.101.241.239 is my router's WAN IP.
    Are the 10.x.x.x address ranges reserved for local network/router
    stuff and etc. like the 192.168.x.x is ????
    If yes, could it be a double NAT problem?

  4. #4
    Kerry Liles
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    "Elton" <eltoni.91@gmail.com> wrote in message
    news:8dee7c45-4b81-4e44-b777-21f7694f6fe3@j2g2000vbo.googlegroups.com...
    >> I presume you ran all those external IP pages more or less around the
    >> same
    >> time of course? Even if your dhcp lease time was small (say 10 minutes??)
    >> your lease should auto-renew at 50% of the time and unless your ISP is
    >> running some sort of weird dhcp server, you would expect to renew a dhcp
    >> lease not get a new IP. If your IP is changing that often, I would be
    >> surprised if you didn't notice other problems - especially with streaming
    >> data like video or audio and the like...
    >>

    >
    > Yes they were run on the same time.
    > Never had problems with streaming data (if by that you mean Youtube,
    > Video Conferencing, Skype, Live Messenger Video Conference, etc).
    >
    >> Can you access your router config and see (from it) what your external IP
    >> address is (and then check it every minute or so for a while? My router
    >> is
    >> set to get my external IP from the ISP (via cable modem) and on the "Wan
    >> setup" page(s) I can see what my external IP is (and for that matter, the
    >> length of the dhcp lease too)

    >
    > I opened my ZTE ZXDSL modem/router's web interface and at Status ->
    > Internet Connection this table shows up:
    >
    > PVC Name VPI/VCI Category Protocol NAT WAN IP Address Status /
    >
    > pppoe_8_35 8/35 UBR PPPoE On 10.101.241.239 Up
    >
    >
    > So I think 10.101.241.239 is my router's WAN IP.
    > Are the 10.x.x.x address ranges reserved for local network/router
    > stuff and etc. like the 192.168.x.x is ????
    > If yes, could it be a double NAT problem?



    Yes, looks like your ISP is assigning you a 10.x.x.x address
    and that range is indeed an RFC1918 range (not routable over the Internet)
    So your *real* external IP address is not so obvious at all... I presume
    there is a lot going on here that may not be easy to sort out! I am not sure
    what "double NAT" means in its entirety, but sure looks like this fits the
    bill.



  5. #5
    Elton
    Guest

    Re: Different external IP address for different "show my IP" pages!!!


    > Yes, looks like your ISP is assigning you a 10.x.x.x address
    > and that range is indeed an RFC1918 range (not routable over the Internet)
    > So your *real* external IP address is not so obvious at all... I presume
    > there is a lot going on here that may not be easy to sort out! I am not sure
    > what "double NAT" means in its entirety, but sure looks like this fits the
    > bill.


    Well thanks for reminding me to see the WAN IP in the router
    config. :)
    About the double NAT, here you could get more info:
    http://inmethod.com/forum/posts/list/908.page

  6. #6
    Kerry Liles
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    "Elton" <eltoni.91@gmail.com> wrote in message
    news:7d9bffcf-b5c0-43e3-9a2e-be25ea909b35@j30g2000vbr.googlegroups.com...
    >
    >> Yes, looks like your ISP is assigning you a 10.x.x.x address
    >> and that range is indeed an RFC1918 range (not routable over the
    >> Internet)
    >> So your *real* external IP address is not so obvious at all... I presume
    >> there is a lot going on here that may not be easy to sort out! I am not
    >> sure
    >> what "double NAT" means in its entirety, but sure looks like this fits
    >> the
    >> bill.

    >
    > Well thanks for reminding me to see the WAN IP in the router
    > config. :)
    > About the double NAT, here you could get more info:
    > http://inmethod.com/forum/posts/list/908.page



    Thanks for the link ... I was aware of double Nat (in a home network setting
    with, for example, two routers in series) but in your case the ISP is using
    an RFC1918 address (and luckily your router was not using the same range...)
    so it becomes a little more difficult to deal with since you dont control
    what each device is doing.

    I don't know if you can get a "real" IP address from your ISP (some ISPs
    here in Canada offer a fixed external address for a small fee or a small
    block of IP addresses for a larger fee...) On the other hand, some ISPs
    have a "no server" policy that prohibits running websites etc (for fear of
    torrent traffic or other 'evils' - I guess) and that is where I often see
    them handing out RFC1918 addresses.... it might be worth calling their tech
    support (your mileage will undoubtably vary)



  7. #7
    Elton
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    > Thanks for the link ... I was aware of double Nat (in a home network setting
    > with, for example, two routers in series) but in your case the ISP is using
    > an RFC1918 address (and luckily your router was not using the same range....)
    > so it becomes a little more difficult to deal with since you dont control
    > what each device is doing.


    So there's no chance to access my home pc externally, from the
    internet?
    What does that mean that my ISP is using an RFC1918 address?
    Does it mean that it maps clients modem/router WAN IPs to the 10.x.x.x
    range?
    What are those X.Y.Z._ IPs?
    Is the ISP mapping the clients modem/router WAN IPs to public real IPs
    in some sort of m:n or 1:1 raport?
    How could it be mapping them?

    > I don't know if you can get a "real" IP address from your ISP (some ISPs
    > here in Canada offer a fixed external address for a small fee or a small
    > block of IP addresses for a larger fee...) *On the other hand, some ISPs
    > have a "no server" policy that prohibits running websites etc (for fear of
    > torrent traffic or other 'evils' - I guess) and that is where I often see
    > them handing out RFC1918 addresses.... it might be worth calling their tech
    > support (your mileage will undoubtably vary)


    I don't know if I can get a real IP address from my ISP, but even if I
    could, I wouldn't because that's not very important for the web
    server.
    I could always experiment locally. I know this isn't the real thing
    but should do it for now.
    I've contacted several times the tech support but they were not
    competent enough to give me an answer. They even couldn't understand
    what I was asking them.

  8. #8
    GlowingBlueMist
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    On 9/21/2010 11:46 AM, Elton wrote:
    > Hi!
    > I have a DSL connection with dynamic IP.
    > My problem is that it seems that different pages that show my external
    > IP, display different results.
    > For example:
    > showip.net shows X.Y.Z.84
    > showmyip.com.ar shows X.Y.Z.86
    > mediacollege.com/internet/utilities/show-ip.shtml shows X.Y.Z.3
    > whatismyip.com shows X.Y.Z.116
    > showmyip.com shows X.Y.Z.3 (this time is the same
    > result as one of the pages above)
    > the No-IP DUC shows X.Y.Z.84
    >
    > Of course the X Y Z don't change.
    > So it seems like for different pages or requests my ISP assigns me
    > different IPs or something, I don't really understand it.
    >
    > Initially I wanted to make my home computer a small web server (nginx
    > listening on port 6789) that could be accessible from the
    > internet and since my IP is dynamic I tried DYNDNS (with no result)
    > and now No-IP (with no result, too).
    > I added the correct entries for port forwarding in Advanced -> NAT ->
    > Virtual Server in my ZTE ZXDSL 831II modem/router (fireware version
    > ZXDSL 831IIV7.5.0a_Z29_AL1) but still couldn't access my web server
    > neither from the DynDNS host or the No-IP host, so I slowly am giving
    > up to the idea of running a web server in my home pc.
    >
    > But I still am curious to learn more about networks and to understand
    > why the above problem (the different WAN IPs problem) happens!
    >
    > So why does that happen?
    > Is it some kind of technique used by ISPs to distribute requests or
    > something?!?!?


    Were you trying to run the Dynamic DNS program/service directly from
    your PC as I suspect or were you using/activating the built in Dynamic
    DNS feature built into your router?

    Try using the router option and see if that clears things up for you as
    it should allow you to actually point it to a specific address on your
    LAN, but you should assign that PC a fixed IP outside the range of your
    router's DNS server, but in the same subnet.

  9. #9
    Kerry Liles
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    "Elton" <eltoni.91@gmail.com> wrote in message
    news:c0f46b93-8082-4571-9407-dcccb5982360@f26g2000vbm.googlegroups.com...
    > Thanks for the link ... I was aware of double Nat (in a home network
    > setting
    > with, for example, two routers in series) but in your case the ISP is
    > using
    > an RFC1918 address (and luckily your router was not using the same
    > range...)
    > so it becomes a little more difficult to deal with since you dont control
    > what each device is doing.


    So there's no chance to access my home pc externally, from the
    internet?
    What does that mean that my ISP is using an RFC1918 address?
    Does it mean that it maps clients modem/router WAN IPs to the 10.x.x.x
    range?
    What are those X.Y.Z._ IPs?
    Is the ISP mapping the clients modem/router WAN IPs to public real IPs
    in some sort of m:n or 1:1 raport?
    How could it be mapping them?

    > I don't know if you can get a "real" IP address from your ISP (some ISPs
    > here in Canada offer a fixed external address for a small fee or a small
    > block of IP addresses for a larger fee...) On the other hand, some ISPs
    > have a "no server" policy that prohibits running websites etc (for fear of
    > torrent traffic or other 'evils' - I guess) and that is where I often see
    > them handing out RFC1918 addresses.... it might be worth calling their
    > tech
    > support (your mileage will undoubtably vary)


    I don't know if I can get a real IP address from my ISP, but even if I
    could, I wouldn't because that's not very important for the web
    server.
    I could always experiment locally. I know this isn't the real thing
    but should do it for now.
    I've contacted several times the tech support but they were not
    competent enough to give me an answer. They even couldn't understand
    what I was asking them.



    Well, it looks like your ISP has at least some of the clients like you on
    the ISPs 10.x.x.x network and it must route internet traffic coming to/from
    you through that 10.x.x.x address. The RFC 1918 addresses:
    10.0.0.0 - 10.255.255.255 (10/8 prefix)
    172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
    192.168.0.0 - 192.168.255.255 (192.168/16 prefix)are not routable on
    the internet, that is why home routers (for example) use those ranges for
    the lan side and map the external (to the router) traffic to the correct
    inside address...I am not sure what the original X.Y.Z.x addresses you see
    represent - I am guessingthat they represent the IP address that is
    "presently" assigned to your DSL connection(and it looks like some gear
    inside the ISP is able to dynamically allocate thatand keep track of it all.
    I am afraid that is all I can guess and if it is the case,it is beyond my
    knowledge...hope this helps



  10. #10
    Char Jackson
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    On Tue, 21 Sep 2010 15:58:12 -0500, GlowingBlueMist
    <glowingbluemist@truely.invalid> wrote:

    >On 9/21/2010 11:46 AM, Elton wrote:
    >> Hi!
    >> I have a DSL connection with dynamic IP.
    >> My problem is that it seems that different pages that show my external
    >> IP, display different results.
    >> For example:
    >> showip.net shows X.Y.Z.84
    >> showmyip.com.ar shows X.Y.Z.86
    >> mediacollege.com/internet/utilities/show-ip.shtml shows X.Y.Z.3
    >> whatismyip.com shows X.Y.Z.116
    >> showmyip.com shows X.Y.Z.3 (this time is the same
    >> result as one of the pages above)
    >> the No-IP DUC shows X.Y.Z.84
    >>
    >> Of course the X Y Z don't change.
    >> So it seems like for different pages or requests my ISP assigns me
    >> different IPs or something, I don't really understand it.
    >>
    >> Initially I wanted to make my home computer a small web server (nginx
    >> listening on port 6789) that could be accessible from the
    >> internet and since my IP is dynamic I tried DYNDNS (with no result)
    >> and now No-IP (with no result, too).
    >> I added the correct entries for port forwarding in Advanced -> NAT ->
    >> Virtual Server in my ZTE ZXDSL 831II modem/router (fireware version
    >> ZXDSL 831IIV7.5.0a_Z29_AL1) but still couldn't access my web server
    >> neither from the DynDNS host or the No-IP host, so I slowly am giving
    >> up to the idea of running a web server in my home pc.
    >>
    >> But I still am curious to learn more about networks and to understand
    >> why the above problem (the different WAN IPs problem) happens!
    >>
    >> So why does that happen?
    >> Is it some kind of technique used by ISPs to distribute requests or
    >> something?!?!?

    >
    >Were you trying to run the Dynamic DNS program/service directly from
    >your PC as I suspect or were you using/activating the built in Dynamic
    >DNS feature built into your router?
    >
    >Try using the router option and see if that clears things up for you as
    >it should allow you to actually point it to a specific address on your
    >LAN, but you should assign that PC a fixed IP outside the range of your
    >router's DNS server, but in the same subnet.


    Suspected typo...that last line should read "outside the range of your
    router's DHCP server..."


  11. #11
    Elton
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    > Try using the router option and see if that clears things up for you as
    > it should allow you to actually point it to a specific address on your
    > LAN, but you should assign that PC a fixed IP outside the range of your
    > router's DNS server, but in the same subnet.


    I was running the Dynamic DNS program/service.
    My router has a builtin option for Dynamic DNS in Advanced -> NAT ->
    Dynamic DNS but it doesn't work.
    This page appears:
    ------------------------------------------------------------------------------
    Dynamic DNS

    This page allows you to provide Internet users with a name (instead of
    an IP address) to access your virtual servers. This ADSL router
    supports dynamic DNS service provided by the provider ' http://www.dyndns.org',
    or 'http://www.tzo.com'. Please register this service at these
    providers first.

    Hostname Username Service Interface Remove

    | Add | | Remove | (buttons)
    ------------------------------------------------------------------------------
    But when I click Add a blank page appears so the option does not work.
    I have also reserved the IP for my web server pc in the Advanced ->
    LAN -> DHCP Server.

  12. #12
    Char Jackson
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    On Tue, 21 Sep 2010 16:13:31 -0700 (PDT), Elton <eltoni.91@gmail.com>
    wrote:

    >> Try using the router option and see if that clears things up for you as
    >> it should allow you to actually point it to a specific address on your
    >> LAN, but you should assign that PC a fixed IP outside the range of your
    >> router's DNS server, but in the same subnet.

    >
    >I was running the Dynamic DNS program/service.
    >My router has a builtin option for Dynamic DNS in Advanced -> NAT ->
    >Dynamic DNS but it doesn't work.
    >This page appears:
    >------------------------------------------------------------------------------
    >Dynamic DNS
    >
    >This page allows you to provide Internet users with a name (instead of
    >an IP address) to access your virtual servers. This ADSL router
    >supports dynamic DNS service provided by the provider ' http://www.dyndns.org',
    >or 'http://www.tzo.com'. Please register this service at these
    >providers first.
    >
    >Hostname Username Service Interface Remove
    >
    > | Add | | Remove | (buttons)
    >------------------------------------------------------------------------------
    >But when I click Add a blank page appears so the option does not work.
    >I have also reserved the IP for my web server pc in the Advanced ->
    >LAN -> DHCP Server.


    As someone else pointed out, you're not likely going to be able to get
    this to work because of the double NAT situation.


  13. #13
    GlowingBlueMist
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    On 9/21/2010 5:14 PM, Char Jackson wrote:
    > On Tue, 21 Sep 2010 15:58:12 -0500, GlowingBlueMist
    > <glowingbluemist@truely.invalid> wrote:
    >
    >> On 9/21/2010 11:46 AM, Elton wrote:
    >>> Hi!
    >>> I have a DSL connection with dynamic IP.
    >>> My problem is that it seems that different pages that show my external
    >>> IP, display different results.
    >>> For example:
    >>> showip.net shows X.Y.Z.84
    >>> showmyip.com.ar shows X.Y.Z.86
    >>> mediacollege.com/internet/utilities/show-ip.shtml shows X.Y.Z.3
    >>> whatismyip.com shows X.Y.Z.116
    >>> showmyip.com shows X.Y.Z.3 (this time is the same
    >>> result as one of the pages above)
    >>> the No-IP DUC shows X.Y.Z.84
    >>>
    >>> Of course the X Y Z don't change.
    >>> So it seems like for different pages or requests my ISP assigns me
    >>> different IPs or something, I don't really understand it.
    >>>
    >>> Initially I wanted to make my home computer a small web server (nginx
    >>> listening on port 6789) that could be accessible from the
    >>> internet and since my IP is dynamic I tried DYNDNS (with no result)
    >>> and now No-IP (with no result, too).
    >>> I added the correct entries for port forwarding in Advanced -> NAT ->
    >>> Virtual Server in my ZTE ZXDSL 831II modem/router (fireware version
    >>> ZXDSL 831IIV7.5.0a_Z29_AL1) but still couldn't access my web server
    >>> neither from the DynDNS host or the No-IP host, so I slowly am giving
    >>> up to the idea of running a web server in my home pc.
    >>>
    >>> But I still am curious to learn more about networks and to understand
    >>> why the above problem (the different WAN IPs problem) happens!
    >>>
    >>> So why does that happen?
    >>> Is it some kind of technique used by ISPs to distribute requests or
    >>> something?!?!?

    >>
    >> Were you trying to run the Dynamic DNS program/service directly from
    >> your PC as I suspect or were you using/activating the built in Dynamic
    >> DNS feature built into your router?
    >>
    >> Try using the router option and see if that clears things up for you as
    >> it should allow you to actually point it to a specific address on your
    >> LAN, but you should assign that PC a fixed IP outside the range of your
    >> router's DNS server, but in the same subnet.

    >
    > Suspected typo...that last line should read "outside the range of your
    > router's DHCP server..."
    >

    Yep, as suspected it was a typo.

  14. #14
    GlowingBlueMist
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    On 9/21/2010 7:44 PM, Char Jackson wrote:
    > On Tue, 21 Sep 2010 16:13:31 -0700 (PDT), Elton<eltoni.91@gmail.com>
    > wrote:
    >
    >>> Try using the router option and see if that clears things up for you as
    >>> it should allow you to actually point it to a specific address on your
    >>> LAN, but you should assign that PC a fixed IP outside the range of your
    >>> router's DNS server, but in the same subnet.

    >>
    >> I was running the Dynamic DNS program/service.
    >> My router has a builtin option for Dynamic DNS in Advanced -> NAT ->
    >> Dynamic DNS but it doesn't work.
    >> This page appears:
    >> ------------------------------------------------------------------------------
    >> Dynamic DNS
    >>
    >> This page allows you to provide Internet users with a name (instead of
    >> an IP address) to access your virtual servers. This ADSL router
    >> supports dynamic DNS service provided by the provider ' http://www.dyndns.org',
    >> or 'http://www.tzo.com'. Please register this service at these
    >> providers first.
    >>
    >> Hostname Username Service Interface Remove
    >>
    >> | Add | | Remove | (buttons)
    >> ------------------------------------------------------------------------------
    >> But when I click Add a blank page appears so the option does not work.
    >> I have also reserved the IP for my web server pc in the Advanced ->
    >> LAN -> DHCP Server.

    >
    > As someone else pointed out, you're not likely going to be able to get
    > this to work because of the double NAT situation.
    >


    Sorry about the prior typo.

    Anyway two things come to mind. One is to verify your browser is not
    running an anti-script module, as in Firefox with NoScript. If you are
    you need to allow the web site (your modem/router) or at least the IP
    address of your router to use them or possible blank screens may happen.
    For example my D-Link 2640 modem/router works on some pages but not
    others with Java Scripts blocked as they used scripts to display some of
    the info.


    The other thing might be to use the option to reset the router back to
    default and start over. This time with just the minimum changes needed
    in order to get it online, like account settings and such.

    Then verify the DHCP range assigned to your lan is not the entire
    subnet. Limit it to about 50 address. Since most ISP's or rather
    routers assign the lowest address to the router I usually limit my
    values to 50 and leave 51 to 254 for fixed IP's, if any, but you can
    start at say 51 and go higher and leave the lower numbers for fixed IP's
    if you like.

    After the above has been done and the router rebooted, try the Dynamic
    DNS page of the router again.

    By the way, which ISP are you using for your internet connection? We
    might be able to get more specific depending on the provider in question.

  15. #15
    Bob K
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    On 9/21/2010 12:46 PM, Elton wrote:
    > Hi!
    > I have a DSL connection with dynamic IP.
    > My problem is that it seems that different pages that show my external
    > IP, display different results.
    > For example:
    > showip.net shows X.Y.Z.84
    > showmyip.com.ar shows X.Y.Z.86
    > mediacollege.com/internet/utilities/show-ip.shtml shows X.Y.Z.3
    > whatismyip.com shows X.Y.Z.116
    > showmyip.com shows X.Y.Z.3 (this time is the same
    > result as one of the pages above)
    > the No-IP DUC shows X.Y.Z.84
    >
    > Of course the X Y Z don't change.
    > So it seems like for different pages or requests my ISP assigns me
    > different IPs or something, I don't really understand it.
    >
    > Initially I wanted to make my home computer a small web server (nginx
    > listening on port 6789) that could be accessible from the
    > internet and since my IP is dynamic I tried DYNDNS (with no result)
    > and now No-IP (with no result, too).
    > I added the correct entries for port forwarding in Advanced -> NAT ->
    > Virtual Server in my ZTE ZXDSL 831II modem/router (fireware version
    > ZXDSL 831IIV7.5.0a_Z29_AL1) but still couldn't access my web server
    > neither from the DynDNS host or the No-IP host, so I slowly am giving
    > up to the idea of running a web server in my home pc.
    >
    > But I still am curious to learn more about networks and to understand
    > why the above problem (the different WAN IPs problem) happens!
    >
    > So why does that happen?
    > Is it some kind of technique used by ISPs to distribute requests or
    > something?!?!?


    I assume you don't have any type of anonymizer service you are using to
    browse the web.

    ....Bob

  16. #16
    Elton
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    > I assume you don't have any type of anonymizer service you are using to
    > browse the web.
    >
    > ...Bob


    No, I don't.

  17. #17
    Elton
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    > Anyway two things come to mind. *One is to verify your browser is not
    > running an anti-script module, as in Firefox with NoScript. *If you are
    > you need to allow the web site (your modem/router) or at least the IP
    > address of your router to use them or possible blank screens may happen.
    > * For example my D-Link 2640 modem/router works on some pages but not
    > others with Java Scripts blocked as they used scripts to display some of
    > the info.


    I'm using Google Chrome 6.

    > Then verify the DHCP range assigned to your lan is not the entire
    > subnet. *Limit it to about 50 address. *Since most ISP's or rather
    > routers assign the lowest address to the router I usually limit my
    > values to 50 and leave 51 to 254 for fixed IP's, if any, but you can
    > start at say 51 and go higher and leave the lower numbers for fixed IP's
    > if you like.


    This is what I was asking for in my previous replies.
    Why should I limit my DHCP's server range when I have only 2 PCs in my
    home network that always get assigned their predefined IPs in the DHCP
    server's reserved IP list, and when I don't need the other IPs because
    my network has always only 2 desktop PCs?
    Is there any technical reason?

    > After the above has been done and the router rebooted, try the Dynamic
    > DNS page of the router again.


    Tried that. No effect.

    > By the way, which ISP are you using for your internet connection? *We
    > might be able to get more specific depending on the provider in question.


    I use Albtelecom. (I live in Albania)

  18. #18
    Elton
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    About the initial question for the different external IPs: could we
    safely assume that my ISP has a double NAT configuration or is it
    something else that causes this behaviour?

  19. #19
    Char Jackson
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    On Wed, 22 Sep 2010 18:03:36 -0700 (PDT), Elton <eltoni.91@gmail.com>
    wrote:

    >Why should I limit my DHCP's server range when I have only 2 PCs in my
    >home network that always get assigned their predefined IPs in the DHCP
    >server's reserved IP list, and when I don't need the other IPs because
    >my network has always only 2 desktop PCs?
    >Is there any technical reason?


    I forget now, but didn't this whole sub-thread get started because you
    wanted to assign an IP address that wouldn't change to your web
    server? One bit of advice was to assign an address outside of your
    DHCP server range, but you couldn't because your entire subnet was
    dedicated to DHCP. I think that's how all of this got started, and as
    you've seen, there are several ways to approach the problem of
    assigning IP's, each about as good as another as long they meet your
    needs.


  20. #20
    Char Jackson
    Guest

    Re: Different external IP address for different "show my IP" pages!!!

    On Wed, 22 Sep 2010 18:22:20 -0700 (PDT), Elton <eltoni.91@gmail.com>
    wrote:

    >About the initial question for the different external IPs: could we
    >safely assume that my ISP has a double NAT configuration or is it
    >something else that causes this behaviour?


    I thought you verified that the other day. From your router's
    perspective, its WAN IP is in the 10.x.x.x space, and that address
    gets NAT'd to a routable IP by your ISP. That's double NAT.


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