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Bug #518

closed

Name resolution from a jail

Added by qhwt+dfly almost 18 years ago. Updated almost 18 years ago.

Status:
Closed
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
Due date:
% Done:

0%

Estimated time:

Description

Hello.
ISTR posting a similar report a half year ago, but I'm not sure
if it's related or not... This occurs on -DEVELOPMENT, not on
1.6.1-RELEASE (but I haven't tried 1.6.2 yet).
I just did a `make DESTDIR=/path/to/jail installworld' in advance
to make sure that the jail is up-to-date with the jail host.

Depending the program, the source address of UDP packets from the
DNS query shows up corrupted in netstat -anfinet output:

$ cat /etc/resolv.conf
domain .
nameserver 192.168.2.175

$ w
6:13PM up 2:52, 1 user, load averages: 0.19, 0.25, 0.13
USER TTY FROM LOGIN@ IDLE WHAT
(press control+Z here, as it's stuck on reverse name resolution)
$ netstat -anfinet |fgrep .53
udp4 0 0 64.125.66.215.1119 192.168.2.175.53
~~~~~~~~~~~
this address doesn't belong to our network.

$ host 192.168.2.251
251.2.168.192.in-addr.arpa has no PTR record

Same thing happens to sshd, so I need to set `UseDNS no' in sshd_config
or I can't slogin to the jail(but even with this option, sshd tries
a reverse name lookup and fails). So it seems that `host' command is
using a different resolver library from `w' or `sshd' (if it's a library
problem).

The same problem doesn't happen on the jail host.

The jail node is assigned an IP address 192.168.2.251/32 which is an
alias address of the jail host, which has 192.168.2.250/24.

Regards.

Files

jail-fixaddr.diff (11.7 KB) jail-fixaddr.diff corecode, 01/17/2007 03:43 PM
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