External IP interface fails after a random period of time

Discussion in 'Networking Issues' started by Enze6997, Aug 21, 2006.

  1. Enze6997

    Enze6997 LI Guru Member

    I have a linksys router on what is supposed to be open static IP on the internet. Behind it is a connection to a corporate network

    Ouside is a 64.x.x.x address with 64.x.x.1 as the gateway and inside I have a link to a 10.x.x.x network with the routers ip as 10.x.x.2.

    DHCP server is not being used since the network already has one internally.

    From my understanding there is not a firewall between the router and the internet.

    When I first get everything up and running I can ping the router from the outside no problem for a period of time. After a while (could be 5 minutes could be an hour) pings stop returning and I cannot connect what so ever from the outside. Internally connections work great and the logs show no errors on the router. Its just like it has been cut off.

    I have tried this setup with an RV042 and a BEFSX41. Same results in both cases.

    During my trouble shooting I have disabled all Firwalling and even completely opened up the router for access. Nothing seems to get me a consisten result. The only thing that give me access from the outside again is restarting the router. I have tried several IP's on the subnet for the 64.x.x.x with the same results.

    Could this be some SNMP management monitoring the external range? I am baffled!
  2. Guyfromhe

    Guyfromhe Network Guru Member

    This is a toughie, if you have a wrt54g that supports linux, I would install linux and run tcpdump on it when the problem occurs that way you can see if the traffic is even showing up at the rotuer... When strange problems occur, tcpdump is your friend!
  3. ifican

    ifican Network Guru Member

    This can be so many different things, personally I would get a sniffer, ethereal, wireshark whichever you choose or like and what the traffic from the outside as you try to ping it. This will get you moving in a general direction at what needs to be looked at instead of just guessing, which i know first hand can get very frustrating.
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