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Re: ICMP requests

To: Hayden Myers <hayden@xxxxxxxxxxx>
Subject: Re: ICMP requests
Cc: <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
From: Julian Anastasov <ja@xxxxxx>
Date: Wed, 8 Aug 2001 23:05:26 +0000 (GMT)
        Hello,

On Wed, 8 Aug 2001, Hayden Myers wrote:

> tcpdump showed a large number of destination port unreachable messages.
>
> 15:48:04.693986 eth0 > 64.77.118.84 > 209.178.165.214: icmp: 64.77.118.84
> tcp port www unreachable [tos 0xc0]

        Can you trace the traffic between the real server and the
director to check whether these ICMPs are generated from the real
server. It is possible your real server to generate ICMP errors instead
of TCP RST replies when you deliver the traffic locally by using
ipchains -j REDIRECT in the real servers (not common case with NAT
setups).

> This doesn't seem to make sense as we have a virtual service with a real
> server on port 80.  I thought these messages would be sent out if there
> were no real servers on the virtual service.  Why would these messages be
> sent out?
>
>
>
> Hayden Myers
> Skyline Network Technologies
> hayden@xxxxxxxxxxx
> (888)917-1600x120


Regards

--
Julian Anastasov <ja@xxxxxx>



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