Switched to cable today and have run TCP Optimizer but as you see it does not change MTU or MSS, just RWIN is all that it will change. Using Motorola SB5100 model from cable ISP. Any idea on how to change MTU to 1500 and to change MSS?? TCP Optimizer will not change it.
TCP options string = 020405640103030301010402
MTU = 1420
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.
MSS = 1380
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.
Default Receive Window (RWIN) = 514736
RWIN Scaling (RFC1323) = 3 bits (scale factor of 6)
Unscaled Receive Window = 64342
1. Your Tweakable Settings:
Receive Window (RWIN): 258060
Window Scaling: 2
Path MTU Discovery: OFF
RFC1323 Window Scaling: ON
RFC1323 Time Stamping: OFF
Selective Acks: ON
MSS requested: 1380
TTL: unknown
TTL remaining: 51
2. Test 146000 byte download
Actual data bytes sent: 146000
Actual data packets: 106
Max packet sent (MTU): 1420
Max packet recd (MTU): 576
Retransmitted data packets: 0
sacks you sent: 0
pushed data pkts: 2
data transmit time: 0.591 secs
our max idletime: 74.5 ms
transfer rate: 131079 bytes/sec
transfer rate: 1048 kbits/sec
This is not a speed test!
transfer efficiency: 100%
From Bellsouth DSL to Cable
-
Tailgunner9
- Member
- Posts: 51
- Joined: Sun Jun 01, 2003 9:33 pm
- Location: TN.
to test and change ur mtu this is the best way to do it witout a prog.
"also advise set ur mtu as high possible until it says ur packets need fragmenting"
the best mss is of course 1460
for best mtu use this
Finding the largest MTU, by EXPERIMENT
reset MTU to 1500, reboot, then come back to this!
The best value for MTU is that value just before your packets get fragmented. How do you find out that? By using Ping at an MSDOS command prompt.
Go to Start/ Programs/ MSDOS-PROMPT, and type....
ping -f -l 1472 http://www.dslreports.com
(That is a dash-ell not a dash-one. Also note the spaces in-between the sections) Press Enter. Then reduce 1472 by 10 until you no longer get the "packet needs to be fragmented" error message. Then increase by 1 until you are 1 less from getting "packet need to be fragmented" message again.
Add 28 more to this (since you specified ping packet size, not including IP/ICMP header of 28 bytes) And this is your MaxMTU.
Note:If you can ping through with the number at 1472, you are done! Stop right there. Add 28 and your MaxMTU is 1500.
to find ur ideal rwin...
The formula for finding your "ideal" RWIN, is to take your latency (average ping time in ms x 1.5), multiply that by your advertised (download) speed, and divide that by 8.
example of my settings
100ms
x
1.5
-------150
150
x
6223 but well just say 6000 to prevent overload
-------900000
900000
/
8
----112500 <--------ahhahahhahahha
"also advise set ur mtu as high possible until it says ur packets need fragmenting"
the best mss is of course 1460
for best mtu use this
Finding the largest MTU, by EXPERIMENT
reset MTU to 1500, reboot, then come back to this!
The best value for MTU is that value just before your packets get fragmented. How do you find out that? By using Ping at an MSDOS command prompt.
Go to Start/ Programs/ MSDOS-PROMPT, and type....
ping -f -l 1472 http://www.dslreports.com
(That is a dash-ell not a dash-one. Also note the spaces in-between the sections) Press Enter. Then reduce 1472 by 10 until you no longer get the "packet needs to be fragmented" error message. Then increase by 1 until you are 1 less from getting "packet need to be fragmented" message again.
Add 28 more to this (since you specified ping packet size, not including IP/ICMP header of 28 bytes) And this is your MaxMTU.
Note:If you can ping through with the number at 1472, you are done! Stop right there. Add 28 and your MaxMTU is 1500.
to find ur ideal rwin...
The formula for finding your "ideal" RWIN, is to take your latency (average ping time in ms x 1.5), multiply that by your advertised (download) speed, and divide that by 8.
example of my settings
100ms
x
1.5
-------150
150
x
6223 but well just say 6000 to prevent overload
-------900000
900000
/
8
----112500 <--------ahhahahhahahha
take another analyzer test after you applied thease settings also remove any old dsl connections in the control panel network my network places and also any ppoe software such as ethernet for windows or winpoet
Try thease in the sg optmizer below me to download and install
check - custom settings
network adapter selection -
check modify all adapters
maxmtu 1500
TTL - 64
TCP Receive Window 64240
MTU Discovery - yes
Black Hole Detect - no
Selective Acks - yes
Max Dup ACKs - 2
TCP 1323 windows scailing is checked
Other Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
Lan Browsing Speedup - optimized
Then select "Apply Changes" and reboot to take effect.
1. Under your LAN connection - properties - general tab, uninstall all the protocols there that you do not need.
2. Open IE and select tools - internet options - connections -
LAN settings, make sure NOTHING there is checked.
3. ALWAYS connect your modem via ethernet (NIC) and make sure you have the latest drivers for your NIC from the manufacturer. Set your NIC duplex mode to 10mb half duplex for Cable, for DSL it is ISP dependent unless you are using a router, if so then set it to 100mb full duplex for both Cable & DSL (the instructions are in my Help & Tips link). If you are using a router make sure you have the latest firmware.
4. Clear your temporary internet files.
5. Power cycle your modem, unplug it for atleast 15 seconds.
6. Download and update then do a scan with SpyBot http://beam.to/spybotsd & Ad Aware http://www.lavasoftusa.com/support/download to remove any spyware then install and update SpywareBlaster to stay spyware FREE. YOU MUST USE BOTH AD AWARE & SPYBOT TO ENSURE YOU ARE SPYWARE FREE SINCE ONE FINDS WHAT THE OTHER MISSES.
7. Make sure you do the faster web page tweak in Read1st link.
8. If you have Zone Alarm as a firewall uninstall it then visit Zonelabs.com for further instructions on removing it's left over junk.
9. Install Outpost Firewall http://www.agnitum.com\ or Sygate Firewall http://www.sygate.com/ , both have FREE and Pro versions and are heads above ZA.
10. Scan for viruses with your antivirus app, if you do not have one get one IMMEDIATELY, AVG 6.0 http://www.grisoft.com/us/us_dwnl_free.php is an excellent FREE AV app.
11. Make sure you have ALL of the latest Windows Updates
Try thease in the sg optmizer below me to download and install
check - custom settings
network adapter selection -
check modify all adapters
maxmtu 1500
TTL - 64
TCP Receive Window 64240
MTU Discovery - yes
Black Hole Detect - no
Selective Acks - yes
Max Dup ACKs - 2
TCP 1323 windows scailing is checked
Other Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
Lan Browsing Speedup - optimized
Then select "Apply Changes" and reboot to take effect.
1. Under your LAN connection - properties - general tab, uninstall all the protocols there that you do not need.
2. Open IE and select tools - internet options - connections -
LAN settings, make sure NOTHING there is checked.
3. ALWAYS connect your modem via ethernet (NIC) and make sure you have the latest drivers for your NIC from the manufacturer. Set your NIC duplex mode to 10mb half duplex for Cable, for DSL it is ISP dependent unless you are using a router, if so then set it to 100mb full duplex for both Cable & DSL (the instructions are in my Help & Tips link). If you are using a router make sure you have the latest firmware.
4. Clear your temporary internet files.
5. Power cycle your modem, unplug it for atleast 15 seconds.
6. Download and update then do a scan with SpyBot http://beam.to/spybotsd & Ad Aware http://www.lavasoftusa.com/support/download to remove any spyware then install and update SpywareBlaster to stay spyware FREE. YOU MUST USE BOTH AD AWARE & SPYBOT TO ENSURE YOU ARE SPYWARE FREE SINCE ONE FINDS WHAT THE OTHER MISSES.
7. Make sure you do the faster web page tweak in Read1st link.
8. If you have Zone Alarm as a firewall uninstall it then visit Zonelabs.com for further instructions on removing it's left over junk.
9. Install Outpost Firewall http://www.agnitum.com\ or Sygate Firewall http://www.sygate.com/ , both have FREE and Pro versions and are heads above ZA.
10. Scan for viruses with your antivirus app, if you do not have one get one IMMEDIATELY, AVG 6.0 http://www.grisoft.com/us/us_dwnl_free.php is an excellent FREE AV app.
11. Make sure you have ALL of the latest Windows Updates
Comptia a+ n+
-
Tailgunner9
- Member
- Posts: 51
- Joined: Sun Jun 01, 2003 9:33 pm
- Location: TN.
SG Optomizer & Mr. Coffee
Like I said at the start Mr. Coffee, TCP_SG Optomizer what ever you want to call it, will not change the MTU and MSS from what I reported. Tried it several, several times. Any other ideas on how to get it changed to 1500 MTU and 1460 MSS????? Thanks
-
mnosteele52
- Posts: 11913
- Joined: Tue Jul 24, 2001 12:00 pm
- Location: Chesapeake, VA
-
Tailgunner9
- Member
- Posts: 51
- Joined: Sun Jun 01, 2003 9:33 pm
- Location: TN.
Mtu
Did the reg search you said but found nothing of a 1420. Have also do a format and install of XP, so should not been anything left from Bellsouth ISP. Even after this MTU and MSS will not change. Wonder if cable company has done something to Motorola modem.
-
Tailgunner9
- Member
- Posts: 51
- Joined: Sun Jun 01, 2003 9:33 pm
- Location: TN.
Mtu
MCCOFFEE, I have Network Connections in Control Panel, but it will not let me delete it. I am not on Network or LAN or router, just cable modem. Ready to give up and leave it at 1420 MTU and MSS 1380!!!
-
mnosteele52
- Posts: 11913
- Joined: Tue Jul 24, 2001 12:00 pm
- Location: Chesapeake, VA
Look here in your registry and see if you have the value 1420:
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\
Interfaces\[Adapter ID]]
What do you have listed under your Network connections in your control panel?
What brand of ethernet card are you using?
Are you using a router?
Are you using Internet Connection Sharing?
What protocols are listed under your LAN connection?
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\
Interfaces\[Adapter ID]]
What do you have listed under your Network connections in your control panel?
What brand of ethernet card are you using?
Are you using a router?
Are you using Internet Connection Sharing?
What protocols are listed under your LAN connection?
-
Tailgunner9
- Member
- Posts: 51
- Joined: Sun Jun 01, 2003 9:33 pm
- Location: TN.
Mtu
Nothing in registry where you said to look with 1420 MTU. Use no router, NIC is built into Gigabyte motherboard (Realtek), Local Area Connection in Network connections and will not delete or even give option to delete, no sharing enabled, Nothing checked under LAN. Must be that ISP or modem they gave me has the MTU and MSS set for this ISP. Give up.
TCP options string = 020405640103030101010402
MTU = 1420
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.
MSS = 1380
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.
Default Receive Window (RWIN) = 129720
RWIN Scaling (RFC1323) = 1 bits (scale factor of 2)
Unscaled Receive Window = 64860
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
507840 (MSS x 46 * scale factor of 8)
253920 (MSS x 46 * scale factor of 4)
126960 (MSS x 46 * scale factor of 2)
63480 (MSS x 46)
bandwidth * delay product (Note this is not a speed test):
Your RcvWindow limits you to: 5188.8 kbps (648.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 2075.52 kbps (259.44 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 52 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)
TCP options string = 020405640103030101010402
MTU = 1420
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.
MSS = 1380
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.
Default Receive Window (RWIN) = 129720
RWIN Scaling (RFC1323) = 1 bits (scale factor of 2)
Unscaled Receive Window = 64860
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
507840 (MSS x 46 * scale factor of 8)
253920 (MSS x 46 * scale factor of 4)
126960 (MSS x 46 * scale factor of 2)
63480 (MSS x 46)
bandwidth * delay product (Note this is not a speed test):
Your RcvWindow limits you to: 5188.8 kbps (648.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 2075.52 kbps (259.44 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 52 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)
-
Tailgunner9
- Member
- Posts: 51
- Joined: Sun Jun 01, 2003 9:33 pm
- Location: TN.
Mtu
Thanks for trying to help but will not create a new connection in Network Connections.