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Date:      Mon, 30 Mar 1998 13:57:32 -0800
From:      David Greenman <dg@root.com>
To:        Carey Nairn <cpn@dpac.tas.gov.au>
Cc:        questions@FreeBSD.ORG
Subject:   Re: network performance problems with dual-homed host 
Message-ID:  <199803302157.NAA08867@implode.root.com>
In-Reply-To: Your message of "Tue, 31 Mar 1998 00:27:09 %2B1000." <Pine.BSF.3.96.980331000212.1071C-100000@jumpgate.cpn.org.au> 

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>When email clients connect to the POP server via the router the address is
>translated and all works well, but when connecting via fxp1 (with
>appropriate IP addresses etc. configured on the client machine) the
>connection seems to take a huge amount of time, before eventually making a
>connection.  Once connected, normal transactions occur as expected.
>
>Similarly, telnetting to the external network address works almost
>instantaneously, but telnetting to the internal address incurs the same
>sort of delays.  This doesn't seem to be dns related since the same delays
>occur whether using FQDNs or IP addresses.

   When you connect with telnet, for example, telnetd does a reverse lookup
for the name from the IP address - so it doesn't matter what you specify
on the client machine, the DNS problem is on the server; it's having trouble
either getting to the nameserver, or the nameserver is having trouble getting
to the authority for your in-addr.arpa zone.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project

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