Slow telnet issue (Off-topic)

[plug@arcticmail.com]

> What happens if you telnet into it with the numeric IP address (i.e.
> 10.10.11.2, etc)?

Don't mean jack.  The remote tcpd wrapper, telnetd, sshd,
ftpd, food may (will likely these days) attempt to perform
DNS lookups (reverse and/or forward) on YOUR (the client's)
IP address/FQDN.

For example, in tcpd's PARANOID mode, if the forward and
reverse DNS entries don't agree with each other (which
seems to be about 95% of the time for the Internet at
large), tcpd will drop the connection.


D

* On Fri, Sep 15, 2000 at 10:52:03AM -0700, Jason wrote:
> sinck@ugive.com wrote:
> > 
> > \_ For some reason when people try to telnet into our Solaris box from
> > \_ outside our firewall it takes an incredibly long time to get the
> > \_ login prompt.  I have seen this issue before but I can't remember how
> > \_ the hell I fixed it.  At first I thought it was a reverse DNS lookup
> > \_ failure and so I setup DNS correctly on the client machine and it has
> > \_ no problem doing an nslookup, nor does it take a long time to do a
> > \_ traceroute or ping to the server with IP or name.
> > 
> > Like you noticed, it smells like a reverse DNS issue.  Reality check
> > all the reverse DNSs of the boxes between the Solaris box and
> > 'outside' and see if they come through ok on the Solaris box.  It
> > could be that your firewall isn't reverse DNS and the Solaris box
> > can't get it....?
> > 
> > Also, if you just adjusted the DNS, it might be in DNS propagation
> > hell.
> 
> What happens if you telnet into it with the numeric IP address (i.e.
> 10.10.11.2, etc)?
> 
> -- 
> jkenner@mindspring.com    __
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