no reverse DNS causing connectivity problems

Derek Ragona derek at
Tue Jun 10 02:24:01 UTC 2008

At 08:57 PM 6/9/2008, Jake Evans wrote:
>[Please cc in replies, not currently subscribed. Thank you.]
>I have a quick question that I can't seem to find an answer to via Google 
>so far.
>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.
>So basically their connection kinda hangs while the system waits to 
>timeout on looking up their IP's reverse.
> From what I can tell, I should be able to just set "options timeout:n" 
> and "options attempts:n" in resolv.conf.. BUT it seems FBSD's install 
> doesn't allow you to do this.
>Does anyone know a workaround to this? I thought maybe of changing it 
>directly in resolv.h but then I'd have to rebuild world I think..? Is 
>there perhaps a sysctl solution?
>Thank you so much for your time.

set UseDNS to no in /etc/sshd_config


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