[ale] slow ftp/telnet response

[Stephen Lastinger]

Jeff,     

     More specifically, tcp wrappers on the box is trying to do reverse
dns lookup and unable to relsolve the address.  One way to stop this is
to add the ip's , ip block, etc. to the /etc/hosts.allow file on the
server being telnetted to.  Anything in here is "trusted" and no reverse
lookup is done.  For example, if you had some clients and a server
behind a masq. firewall and were using the 192.168.x.x set of ip's 
there will not be a need to reverse look them up so you could add:

in.telnetd: 192.168.

if you wanted to not do reverse lookups at all for telnet (very much not
recomended!) you could use:

in.telnetd: ALL


-Stephen


Jeff Hubbs wrote:
> 
> Les -
> 
> I believe this is because the target box cannot resolve the IP address of
> the telnetting/ftping box to a name.  I don't quite understand why it should
> care, but care it does.  Implement DNS, WINS via Samba, or even appropriate
> /etc/hosts files and the problem should go away.
> 
> - Jeff
> 
> > -----Original Message-----
> > From: Les Neste [mailto:lesneste at atlnewmedia.com]
> > Sent: Thursday, October 12, 2000 1:24 PM
> > To: ale at ale.org
> > Subject: [ale] slow ftp/telnet response
> >
> >
> > I'm sure this has been discussed at some point but I would
> > appreciate any
> > help regardless.  The issue is, when I connect to my Linux
> > box with either
> > FTP or telnet, it takes about 60 seconds to respond.  Works fine after
> > that, and is very responsive -- that initial response just
> > takes a while.
> > Since I'm upgrading to RH6.2 I'd like to fix this now ... any
> > suggestions?
> >
> > TIA.

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-- 
Stephen Lastinger	 - s.lastinger at computernetdesign.com
      CEO
Computer Network Design 
& Installation, Inc. 	- http://www.computernetdesign.com
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