Why is ssh so slow?

I run SuSE Linux 8.1 on two notebooks I have given the the
addresses

192.168.0.1 sony.silberkuhle.de and
192.168.0.2 vobis.silberkuhle.de

with the mask 255.255.255.0

Everything works fine, except for ssh which needs 2-3 minutes before
I get a response.

Why?

Thanks in advance,

Wolfgang

Wolfgang Mueller uttered the immortal words:

> I run SuSE Linux 8.1 on two notebooks I have given the the
> addresses
>
> 192.168.0.1 sony.silberkuhle.de and
> 192.168.0.2 vobis.silberkuhle.de
>
> with the mask 255.255.255.0
>
> Everything works fine, except for ssh which needs 2-3 minutes before
> I get a response.
>
> Why?

SSH can't perform a reverse DNS lookup and times out. Either run a local DNS
server or edit /etc/hosts.

--
Andy.

On Fri, 05 Mar 2004 20:56:28 +0000, Andy Fraser wrote:
>
> On Fri, 05 Mar 2004 21:45:36 +0100, Wolfgang Mueller
> uttered the immortal words [thanks]:
>
> > I run SuSE Linux 8.1 on two notebooks I have given
> > the addresses
> >
> > 192.168.0.1 sony.silberkuhle.de and
> > 192.168.0.2 vobis.silberkuhle.de
> >
> > with the mask 255.255.255.0
> >
> > Everything works fine, except for ssh which needs
> > 2-3 minutes before I get a response.
> >
> > Why?
>
> SSH can't perform a reverse DNS lookup and times out.
> Either run a local DNS server or edit /etc/hosts.

So far, I have been too lazy for setting up a DNS server;
but, anyway, the the two lines quoted above, i.e.

192.168.0.1 sony.silberkuhle.de
192.168.0.2 vobis.silberkuhle.de

have always been part of the /etc/hosts files of my two
computers. Nevertheless, ssh is so slow. There must be
something else wrong in my computers.

Wolfgang

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Wolfgang Mueller <(E-Mail Removed)> wrote:
> On Fri, 05 Mar 2004 20:56:28 +0000, Andy Fraser wrote:
> >
> > On Fri, 05 Mar 2004 21:45:36 +0100, Wolfgang Mueller
> > uttered the immortal words [thanks]:
> >

[..]

> > >
> > > Everything works fine, except for ssh which needs
> > > 2-3 minutes before I get a response.

[..]

> 192.168.0.1 sony.silberkuhle.de
> 192.168.0.2 vobis.silberkuhle.de

> have always been part of the /etc/hosts files of my two
> computers. Nevertheless, ssh is so slow. There must be
> something else wrong in my computers.

Yep, but then we don't know what ssh uses on your box,
nsswitch.conf, hosts.conf. Simply 'strace' the login and see what
it does and where it hangs.

Hint
man strace
man 5 resolver

As last resort you can switch off reverse lookup from
sshd_config (man sshd_config).

Good luck

- --
Michael Heiming - RHCE (GPG-Key ID: 0xEDD27B94)

Remove +SIGNS and www. if you expect an answer, sorry for
inconvenience, but I get tons of spam.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)

iD8DBQFASf/oAkPEju3Se5QRAsALAKC/ndUoAEpWfVEFmxRoSXfAjmFf5QCgirPG
x5HZ6UKsspdjlj4GataRRfk=
=jDR3
-----END PGP SIGNATURE-----