no reverse DNS causing connectivity problems
jeffrey at goldmark.org
Tue Jun 10 04:08:46 UTC 2008
[mailed and posted]
On Jun 9, 2008, at 8:57 PM, Jake Evans wrote:
> I've had a few people complain that when they telnet/ssh/ftp/web to
> our server, it's slow... I've traced the problem to them having no
> reverse on their IPs.
You should configure your servers to not do the reverse lookup. Not
resolving is certainly the default for Apache. For sshd, set UseDNS
to "no" in /etc/ssh/sshd_config. As for telnet and ftp, I don't know
where that might be configured.
Of course I don't know your needs and situation, but some people might
consider it a reasonable policy to disallow ssh and telnet (and
certainly mail) from hosts that don't have proper PTR records.
Jeffrey Goldberg http://www.goldmark.org/jeff/
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