Telstra/Paradise Proxy ARPs

Discussion in 'NZ Computing' started by tutaepaki, Aug 12, 2004.

  1. tutaepaki

    tutaepaki Guest

    Has anyone notice a large increase in the number of ARPs they are seeing on
    telstra cable over the last 6-8 weeks?

    I noticed the traffic on my ethernet was way up, and after finally gettng
    around to looking at what was causing it, it is ARPs, mostly from the
    Paradise router, for lots of different
    IPs. ie, the router is doing proxy ARP for all the networks it is attached
    too. It's not costing me anything because Paradise don't take that off the
    cap, but it's curious.

    I expect to see ARPs, but I didn't really expect to see the Paradise router
    ARPing on behalf of all the connected networks, and the only reason I can
    think of for that, is that the router has got proxy arp enabled.
    tutaepaki, Aug 12, 2004
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  2. It's not proxy arping, they are valid ARP requests for all the logical
    networks that bertha is a gateway for on that particular interface. There
    is an application that is usually running that responds to repeated ARP
    requests, thus fooling bertha into populating its ARP cache for IP
    addresses that aren't being used. This means bertha does not generate an
    ARP request for each packet it receives for an unused IP address. However,
    this application is currently switched off due to some technical problems.
    This should be fixed soon.
    Nigel Roberts, Aug 13, 2004
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  3. This is fixed now.

    Nigel Roberts, Aug 13, 2004
  4. Thanks for taking the time to explain it here. Its a rare occurance
    these days :)

    Bruce Fitzsimons, Aug 13, 2004
  5. tutaepaki

    tutaepaki Guest

    Thanks indeed for explaining this.
    tutaepaki, Aug 16, 2004
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