Results 1 to 5 of 5

Thread: ASUS Router Merlin showing two differnt WAN ip address

  1. #1
    Regular Member
    Join Date
    Dec 2005
    Posts
    115

    ASUS Router Merlin showing two differnt WAN ip address

    Dear folk

    I have got ASUS ROUTER RTAC5300 with Merlin firmware latest version

    Before I connected to VPN and thorough the website

    Code:
    https://whatismyipaddress.com
    it was showing public ip address different from the "General" --> "Network Map"

    And now when I connected to VPN it is still showing two different public ip addresses please see attached snapshots

    Why is it happening like that ?

    Thx

  2. #2
    Administrator Philip's Avatar
    Join Date
    May 1999
    Location
    Jacksonville, Florida
    Posts
    11,082
    Blog Entries
    6
    Hello Zillah, good to see you around

    The 103.212.x.x. IP is your actual external public IP address that is seen onto the internet.
    The 100.97.x.x IP address is a private address, generally reserved for NAT between internet service providers and subscribers. Any IP between 100.64.0.0 ~ 100.127.255.255 (100.64.0.0/10 prefix) is reserved for carrier-grade NAT.

    In other words, your ISP is using NAT to give out more private IPs to their subscribers, and then translates between those private IPs and public IPs seen onto the internet.


    You could see your IP on our site here: https://www.speedguide.net/ip/

    And the private/reserved IPs are listed here: https://www.speedguide.net/ip/100.99.1.1


    I hope this helps.
    Linux is user friendly, it's just picky about its friends...
    Disclaimer: Please use caution when opening messages, my grasp on reality may have shaken loose during transmission (going on rusty memory circuits).
    ๑۩۞۩๑

  3. #3
    Regular Member
    Join Date
    Dec 2005
    Posts
    115

    carrier-grade NAT

    Hi Philip

    Thanks for your help and I have to admit learning a lot from your knowledge

    The 103.212.x.x. IP is your actual external public IP address that is seen onto the internet.
    Yes no doubt

    The 100.97.x.x IP address is a private address, generally reserved for NAT between internet service providers and subscribers. Any IP between 100.64.0.0 ~ 100.127.255.255 (100.64.0.0/10 prefix) is reserved for carrier-grade NAT.
    This is something new to me and it makes sense ,,,,,,but now I have got a question

    Has this been a practice by ISPs since while ?? As what I had seen in past public ip addresses not the ip 100.x.x.x range ,,,,please see for instance attached snapshot that captured April 28 2019

    https://imgur.com/a/BmVROhx

    Then the same router it is public ip address changed to 58.17x.7x.12x on May 5 2020 (I didn't take a snapshot I just recorded the value into an Excel sheet)

    Other routers unfortunately I didn't record their public ip addresses

  4. #4
    Administrator Philip's Avatar
    Join Date
    May 1999
    Location
    Jacksonville, Florida
    Posts
    11,082
    Blog Entries
    6
    This is usually practiced by smaller ISPs, when they have more customers than the available to them IP pool (version4).

    Used to be more common years ago, haven't seen US ISPs do it for a while, as IPv6 becomes more prevalent.
    Linux is user friendly, it's just picky about its friends...
    Disclaimer: Please use caution when opening messages, my grasp on reality may have shaken loose during transmission (going on rusty memory circuits).
    ๑۩۞۩๑

  5. #5
    Regular Member
    Join Date
    Dec 2005
    Posts
    115

    This is usually practiced by smaller ISPs

    This is usually practiced by smaller ISPs
    Differently this is my case now it makes seance
    Thx Philip

Similar Threads

  1. ASUS Merlin not showing static ip addresses
    By zillah in forum Wireless Networks & Routers
    Replies: 3
    Last Post: 01-02-21, 08:49 AM
  2. Replies: 1
    Last Post: 05-18-04, 07:37 PM
  3. Check differnt site's rank's
    By deleted_acct in forum General Discussion Board
    Replies: 8
    Last Post: 09-13-03, 03:47 PM
  4. Not Showing IP Address
    By Dennis in forum Network Security
    Replies: 5
    Last Post: 02-20-00, 10:54 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •