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WRT54G3G - wrong DDNS support

Discussion in 'Cisco/Linksys Wireless Routers' started by piotr.dobrogost, Jan 7, 2008.

  1. piotr.dobrogost

    piotr.dobrogost LI Guru Member

    Hi

    My setup:
    Internet <-> CISCO VPN router (Head Office) <-> CISCO VPN router (Our branch) <-> WRT54G3G (WAN port) and
    Internet <-> WRT54G3G (Express Card, UMTS)

    I'm using WRT54G3G to connect both wireless via UMTS and via wan port with local CISCO vpn router connected with the head office. The head office supports connecting to the internet through our vpn connection (proxy). Now when the UMTS is off (no card for example) DDNS service on the router updates DynDNS site with wan ip (private ip obtained from CISCO vpn router) and not the public ip on the far end of vpn tunnel. DynDNS auto detected ip (given on the DynDNS site) is the right one. It looks like wrong DDNS support in WRT54G3G.

    Could someone verify this, please?
     
  2. mstombs

    mstombs Network Guru Member

    I think this is standard behaviour for router DDNS - they report the IP on the local WAN interface, they don't use the external seen WAN IP by querying a remote website - and I don't think dyndns would like it either!

    There are of course plenty of PC programs that do do this remote lookup - they can expect to be behind a nat router so have to do this.
     
  3. piotr.dobrogost

    piotr.dobrogost LI Guru Member

    Not quite. I've recently seen an information of a fix of this behaviour mentioned in some router's firmware release. I don't remember which one that was.

    And the router must not expect to be behind a nat? :) In the world of routers one's wan is more often then seldom other's lan :)
    Taking into consideration a number of DDNS clients behind nat I'd be very surprised if DynDNS hadn't exposed THEIR OWN, STANDARD auto detection of ip address to ALL clients of their dynamic ip service. I mean that should (is?) probably a part of their protocol.
     
  4. mstombs

    mstombs Network Guru Member

    http://www.dyndns.com/developers/checkip.html

    But also dyndns is not the only supported ddns
     

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