RV082 routing problem

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by kopija, Dec 7, 2007.

  1. kopija

    kopija LI Guru Member

    Hello everybody,

    I have written about this problem before but haven't received any meaningful answer on subject.

    Here is the problem:

    The router is in load balancing mode.

    When the router loses his public IP address from cable modem (because the cable modem connection to the CMTS has been lost) the cable modem assigns the router private IP address Router Removes ixp1 (cable modem connection) in log, but the Load balacing keeps working. When I do traceroute I have many lost packets.
    After I manually release IP from WAN1 (ixp1) interface routing gets back to normal and we can use the remaining connection WAN2 (ixp2) normally.

    Does anyone have any idea how to fix this so that the load balancing disconnects the faulty WAN interface and route properly without having to do it manually?

    Best Regards,
  2. d__l

    d__l Network Guru Member

    Have you enabled Network Service Detection? Once the router realizes it can't ping some IP of your chosing beyond your cable modem, then it should stop trying to send packets out that WAN.

    This function works great on my DSL connections.
  3. kopija

    kopija LI Guru Member

    Of course the Network Detection is enabled.

    It properly removes ixp1 when the ping fails when interface has public IP, but if I restart the cable modem and it doesn't get public IP from the CMTS, the cable modem itself sends private ip of 192.168.100.xxx to the RV082, and then the things go bad.

    The router keeps using ixp1, like nothing has been wrong, because it has an assigned private IP address.

    Help is still needed on this issue.

  4. pablito

    pablito Network Guru Member

    Have you tried setting the ping'd IP to something beyond the local gateway? I have the same problem so I locate an IP at the ISP to ping. So if I get a 100.* IP it shouldn't be able to pass the detection test. It might reach the default gateway but can't get further. I can't confirm since mine fails so infrequently but so far I haven't been left without real access.
  5. d__l

    d__l Network Guru Member

    I'll repeat what I said. Once the router realizes it can't ping some IP of your choosing beyond your cable modem, then it should stop trying to send packets out that WAN.

    You didn't enable Network Detection properly, if your router isn't doing that!
  6. kopija

    kopija LI Guru Member

    OK. The Network Detection is enabled properly. Router is in Load Balance (auto mode). I'm pinging ISP host by IP beyond that modem on ixp1. The log says that ih has suspended that connection (ixp1).

    When the router has public IP on that connection (before releasing/renewing) and the network is down everything acts as expected - all traffic goes to the second connection (ixp2) but... if I reset the modem, and the modem assigns private IP of 192.168.100.nnn to the ixp1 then things go bad with packet loss and bad routing because it seem like the router is sending packets through both connections.
    Even if it cannot ping the ISP host, designated as the one for network fail detection, router uses that connection (ixp1) for Load balancing.

    Do I have to use advanced routing to tell the router that it should ping specified host only through that connection (ixp1)?

    Can someone try to reproduce the problem?
  7. cfinic

    cfinic LI Guru Member

    Well I know that some ISPs will cut off a connection if you're load balancing. Where you send out a request through ISP1 and it comes back through ISP2 (or vice versa) I'd say have a quick chat with your ISP and see if they're doing anything from there end, like blocking your modem's mac address after such an incident.
  8. kopija

    kopija LI Guru Member

    Thanks for the hint but my ISP isn't cutting of my link deliberately. The loss of connection is due to the tehnical problems (loss of power, weak signal... etc).

    Anybody else?
    Tchekbo likes this.
  9. Tchekbo

    Tchekbo Networkin' Nut Member

    I have the same problem with my rv042. I have two isp and if I disconnect the line, an LAN ip is automatically generated and the router rv042 don't detect a wan connexion lost. Even if the Network Service Detection is enabled with a ping to host externaly. Sorry my english is bad...
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