Ian Ward wrote:
> Intermittently (twice in 4 days) they stop working. The call is still up to
> Telstra (the techs at telstra could see it), if I ping the clients address I
> get the following:
>
> >From FastEthernet0.civ4.Canberra.telstra.net (203.50.10.6): Source Quench
There are presumably other symptoms that you haven't mentioned (or
observed), these would point to the actual problem. What you are seeing
is that the router one hop before the destination host is detecting and
reporting congestion for datagrams destined for that host, perhaps
because it has a long queue of datagrams waiting to be sent. The source
quench is a request to the sender to back off a little bit, in order to
reduce the probability of actual datagram loss, but it has not detected
that the destination host is unreachable (yet).
Causes include:
- The destination host has crashed, without dropping its link and the
Telstra router hasn't declared it dead yet.
- Someone is pulling (or pushing) a huge amount of traffic down the
link. Think lots of concurrent fat downloads, or even DOS. (Does the
site have enemies?)
- Raz
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