ICMP Redirect mystery

Discussion in 'Network Routers' started by Rainer Stolze, Jan 11, 2010.

  1. Hi,

    I just received a very unfriendly mail from the network supervisor of my
    dorm accusing me of interfering with normal network operation.
    Apparently he tried to ping some other pc on the network but instead got
    a Redirect message from my private router that seems to bother him.

    Accompanying the complaint he sent the following log:
    PING wlan204.x.y.net (192.168.1.202) 56(84) bytes of data.
    - From pip38.x.y.net (192.168.2.38): icmp_seq=1 Redirect
    Host(New nexthop: pip2.x.y.net (192.168.2.2))

    192.168.2.38 is the ip of my small private SOHO single NAT router I use
    to get all my devices online.
    192.168.2.2 is the ip of the gateway my router uses to connect to the
    internet.

    Unfortunately I have absolutely no idea why my router even got the ping
    at first place. Further on I have no idea why it then replied to it at all.
    The network appears to be quite modern so I assume there are switches
    instead of hubs so packets should only be directed to their actual
    destination. Next I assume that one of the first rules for a router's
    packet filter is to discard all packets, that are not addressed directly
    to it.

    At the moment I seriously doubt that my router alone is responsible for
    the problem.

    Any idea what there might be wrong and how to probably fix it?
    For what its worth as a first measure I told my router not to reply to
    any incoming pings at all.

    Best regards
    Rainer
     
    Rainer Stolze, Jan 11, 2010
    #1
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  2. Not sure but it sounds like your router has RIP or RIP2 enabled. Turn it
    off if you find it is on in your router.
     
    GlowingBlueMist, Jan 12, 2010
    #2
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