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Date:      Wed, 4 Dec 2002 14:46:44 -0500
From:      "Allan Jude" <937863@primus.ca>
To:        <freebsd-stable@freebsd.org>
Subject:   RE: DNS query from public IP though localhost specified
Message-ID:  <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA4RatOouMvEOzXXL4aXw9/cKAAAAQAAAAO9tPW30zwEK83aYi7+DsmQEAAAAA@primus.ca>
In-Reply-To: <20021204104103.F56412@oolong.il.thewrittenword.com>

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Connecting to any of your ips from your own box, will route through
localhost (netstat -rn)


-----Original Message-----
From: owner-freebsd-stable@FreeBSD.ORG
[mailto:owner-freebsd-stable@FreeBSD.ORG] On Behalf Of Albert Chin
Sent: Wednesday, December 04, 2002 11:41 AM
To: freebsd-stable@freebsd.org
Subject: DNS query from public IP though localhost specified


I have a multihomed FreeBSD 4.6-STABLE box with two public IPs on xl0
and one private IP on xl1. The hostname corresponds to the private IP
on xl1. This box acts as a nameserver running BIND 9.2.1 and
/etc/resolv.conf is configured as:
  search [internal domain] [external domain]
  nameserver 127.0.0.1

If I try to ssh to this host from another box and have "tcpdump -i
lo0" running, I get tcpdump output indicating:
  18:16:48.342762 [public hostname].1572 > [public hostname].domain:
19465+ PTR? [rev internal ip].in-addr.arpa. (43)
  18:16:48.343292 [public hostname].domain > [public hostname].1572:
19465 Refused 0/0/0 (43)
  18:16:48.346175 localhost.[internal domain].1573 > localhost.[internal
domain].domain:  12661+ PTR? [rev internal ip].in-addr.arpa. (43)
  18:16:48.346555 localhost.[internal domain].domain >
localhost.[internal domain].1573:  12661* 1/1/1 PTR[|domain]

It seems that only ssh causes this behaviour. ftpd causes only
localhost lookups.

So, why am I seeing queries from the public IP on xl0 while listening
on lo0

-- 
albert chin (china@thewrittenword.com)

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