DDNS - External IP Address Checker

Discussion in 'Tomato Firmware' started by john8791, Jul 20, 2010.

  1. john8791

    john8791 Networkin' Nut Member

    I am running Tomato 1.28 on a WRT54GL. I have a DYNDNS account and have set up SSH access in Tomato so I can establish a tunnel from remote locations with PuTTY. With the "recommended" IP address setting of "Use WAN Address", it grabs the address assigned by my DSL modem
    This obviously didn't work so I set it to "Use External IP Address Checker (every 10 minutes)". This works, but I don't understand the mechanism it is using. Also, if it is checking it every 10 minutes, why is there an option below it to "Auto refresh every X days"? It is set to 28 right now. I have read the online Wiki but am very confused about this. Thanks!
  2. mstombs

    mstombs Network Guru Member

    If your router is getting a local IP address you must be running in double nat mode with the ppp endpoint in the modem? If dsl is pppoe you should consider putting the modem into full-bridge mode and let the router get the true WAN IP.

    The external IP address checker relies on the fact that any remote web site accessed knows what IP address to reply to, for example




    The 28 day timer is different, that's for free dyndns accounts which expire after 31 days if not refreshed - many folk with cable modems find their dynamic IP does not change very often - I don't find this a problem with adsl!
  3. john8791

    john8791 Networkin' Nut Member

    Unfortunately it appears Qwest does not allow transparent bridging with the DSL service I have. Thanks for clearing up the 10min / 28 day thing!
  4. john8791

    john8791 Networkin' Nut Member

    I found out that Qwest does not "support" using the modem as a transparent bridge, but it will work. I even got the PPPoE password from them. I am anxious to try it but am worried that I won't be able to access the modem's web interface after I do it. Any thoughts?
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