Setting up my new DSL modem with my linksys router

Discussion in 'Networking Issues' started by Kyin01, Jul 14, 2007.

  1. Kyin01

    Kyin01 LI Guru Member

    Hey everyone!

    So up until recently I was using a roadrunner cable modem. Today I got my DSL modem in the mail and I'm trying to set it up with my linksys router but it wouldn't work

    Normally with my cable modem I have it connected to the router and my router than connects to my PC. I always set my router to 'clone mac address' and than I have internet no problems!

    With my DSL modem, I got it working (right now) when it connects DIRECTLY to my PC. However when I try to connect it to my router and tell my router to clone mac address again, I don't have internet anymore. All the LED lights show up and everything but I can't load any pages.

    My linksys router is a WRT54GS Ver2.
    My new DSL modem is a 2WIRE 2701-HGB
    My OS is XP pro XP2.

    Any ideas?
  2. Noelbou

    Noelbou LI Guru Member

    Cable and ADSL modems are quite different ...
    ADSL use PPPoE to connect to your ISP
    Some modem have built-in PPPoe client and some not.
    If not, you need to setup your router to use PPPoe and configure your user name / pwd. If your modem has it's own PPPoE client you must configure it and set the router to DHCP.

    Hope this helps ...

  3. Kyin01

    Kyin01 LI Guru Member

    I think my modem has a built in PPPoE because everytime I use the internet I never have to enter a username and password.

    But as of right now my router is already DCHP and it still won't connect
  4. mstombs

    mstombs Network Guru Member

    When you connect your XP machine directly what IP address/ Gateway does it get?

    If a local IP address 192.168.x.y or 10.x.y.z then the modem is actually a NAT router, should work but you end up with double NAT which causes other problems.

    If the XP machine gets the external ISP IP then the modem is running in a Half-Bridge mode, which can cause the router problems as the netmask may be and the gateway not in the same Network as the IP address (XP doesn't mind this, the old version of Linux and dhcp on Linksys routers needs help to understand it)

    If you can you should set the modem in a full-bridge mode and the router as PPPOE connection, entering the username/password into router not modem.
  5. joepierson

    joepierson Guest

    When I connect my XP machine to my ISP, I get a public addy with a /32 netmask and a GW. External internet works perfect. It is not bridging, it is totally routed using /32 masks. When I connect my Linksys though, it gets all the DHCP info correct (as did the XP), I just cannot ping anything beyond the Linksys. Do you have any further instructions on how to "help" the Linksys to understand /32 addressing? Is there another brand of router (i.e. Belkin or Netgear) that can handle /32 addressing via DHCP natively?

  6. mstombs

    mstombs Network Guru Member

    You do not say what version of the Linksys router you have. If its an WRT54GL or older G/GS and you can load Hyperwrt or Tomato 3rd party firmware then the firewall script posted in this thread should be able to fix the problem of Gateway not being in the same local network defined by the IP address and Netmask.

    This is not a fundamental problem with Linux - it is just the dhcp action script that fails to set the route commands commands correctly when a new IP address received.

    If a newer WRT54G/GS that runs vxWorks I do not know if suffers the same problem with linksys or dd-wrt micro firmware, I have seen posts that suggested older versions of dd-wrt had the same issue.
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