Vista-Problem with modem access thru router

Discussion in 'Networking Issues' started by der_Kief, Oct 3, 2007.

  1. der_Kief

    der_Kief Super Moderator Staff Member Member

    Hi @ All,

    a few days ago i switched from XP to Vista x86. Since this time i cannot readout (sm50b) the data of my DSL modem anymore :mad:
    With XP there were no problems at all. Because nothing changed with the router/modem config i guess the problem is Vista.

    The router (WRT54GL with Tomato) config:
    (init) ip addr add dev vlan1 brd +
    (firewall) iptables -I POSTROUTING -t nat -o vlan1 -d -j MASQUERADE

    Modem IP:
    Router IP : (vlan1) ; (br0)
    Vista-PC IP:

    Ping from router to modem -> no problem
    Ping from Vista-PC to router ( -> no problem
    Ping from Vista-PC to modem ( -> no reply

    Does anyone have similar problems? Maybe there is a workaround.

  2. mstombs

    mstombs Network Guru Member

    I suspect this is due to the fact that 169.254.x.y addresses are supposed to be reserved for windows automatic IP allocation in the event of dhcp failure. Vista is probably only looking on the local LAN for the address, not routing its request via the router. Enabling proxy_arp on Tomato may help, but never tried this on router but I do use on similar linux version in my modem...

    echo 1 >/proc/sys/net/ipv4/conf/br0/proxy_arp
    echo 1 >/proc/sys/net/ipv4/conf/vlan1/proxy_arp
  3. frenchy2k1

    frenchy2k1 LI Guru Member

    you can probably tell explicitly the router to forward requests to that IP to the WAN port of the router.

    I had to do that on my setup, but it is a bit different:
    modem (IP= + dyn IP)
    router ( + dyn IP passed from modem)
    comps (192.168.X.X).
    To be able to access the 1982.168.0.X sublan on the other side of the router (WAN port), I had to configure this route in the interface.
  4. der_Kief

    der_Kief Super Moderator Staff Member Member

    Hey man THATS IT. Thanks a lot :biggrin:

    Can i put these 2 lines in the Init script section incase the router reboots ? Is this whole procedure a security risk from the wan side ?
    Is there a way to make changes in Vista than in the router ?

    Again, thanks a lot

  5. der_Kief

    der_Kief Super Moderator Staff Member Member


    the problem still exist but only when i had a VPN session with Vista. After a reboot it works again without a problem until i had the next VPN session. Hmmm, whats the problem here.

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