On Wed, May 16, 2001 at 10:53:59AM +0300, Miki Shapiro wrote:
> Question regarding SuSE and possibly other/all distros:
> some server applications back-resolve the IP of the clients that
> connect to them. Is this done by the server application or by an OS
> facility?
To add to Eli's reply, all servers which use tcpwrappers (either
standalone or servers being run by inetd via /usr/sbin/tcpd) attempt to
backresolve the IP, in order to match it against the /etc/hosts.allow
and /etc/hosts.deny files.
> It happened to me with ssh2d server.
SSHd (atleast the one shipped with OpenSSH) seems to support both
tcpwrappers (if compiled with LIBWRAP) and resolving on it's own
(ReverseMappingCheck option). I'm not sure whether tcpwrappers support
can be disabled without recompilation.
> I have a friend who set up samba and ISDN dial-on-demand, also on SuSE. He
> complained that every connection to samba triggered an internet
> connection. Can this be related?
It has something to do with subnet broadcasts SAMBA uses.
See: http://milliways.stat.unipd.it/doc/isdn4k-utils-3.1/i4lfaq-16.html#ss16.9
(2nd result on Google for "SAMBA triggers dialup")
--
Best regards,
Ilya Konstantinov
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