Delays in ssh connections between two local Linux computers

[Shlomi Fish]

Hi Ram-on,

On Mon, Sep 12, 2011 at 6:27 PM, Ram-on Agmon <agmonr at gmail.com> wrote:
> You might have a problem with the dns resolution. Add the ip of both the
> machine to both /etc/hosts or disable the dns options in the sshd config.
>

I'm actually sshing using IP addreses. I added "UseDNS no" to the
sshd_config, but it didn't help.

Thanks anyway.

Regards,

-- Shlomi Fish

> Ram on
>
> On Mon, Sep 12, 2011 at 5:34 PM, Shlomi Fish <shlomif at gmail.com> wrote:
>>
>> Hi Kfir,
>>
>> On Mon, Sep 12, 2011 at 5:25 PM, Kfir Lavi <lavi.kfir at gmail.com> wrote:
>> >
>> >
>> > On Mon, Sep 12, 2011 at 4:37 PM, Shlomi Fish <shlomif at gmail.com> wrote:
>> >>
>> >> Hi all,
>> >>
>> >> (I apologise from writing from my gmail.com account, but as you'll see
>> >> below,
>> >> writing from my home E-mail account is not bearable.).
>> >>
>> >> I have a desktop x86-64 Core i3 machine (running Mageia Linux 1) that
>> >> connects
>> >> via wired Ethernet to my NAT/router and there is a remote x86-64 Core
>> >> Duo
>> >> laptop (running Mageia Linux 2), connected via wireless. Often when I
>> >> type
>> >> commands on bash on the remote laptop via ssh, there is a significant
>> >> delay,
>> >> and moreover running claws-mail or gringotts (two fast gtk+ apps) from
>> >> the
>> >> laptop are slow, which hadn't been the case with my older desktop
>> >> machine.
>> >> tcpdump -i wlan0 on the laptop and htop on the laptop show nothing that
>> >> might
>> >> cause it.
>> >>
>> >> The delays in the connectivity were not bad with the previous desktop
>> >> machine
>> >> which was an old Pentium 4 2.4GHz machine, which was much slower and
>> >> underpowered.
>> >>
>> >> So far I tried:
>> >>
>> >> 1. Doing /etc/init.d/iptables stop on the desktop machine.
>> >>
>> >> 2. Relocating the laptop closer to the wifi NAT/router.
>> >>
>> >> Neither of those helped.
>> >>
>> >> Can anyone shed any light on this?
>> >>
>> >> Regards,
>> >>
>> >> -- Shlomi Fish
>> >>
>> >>
>> >> --
>> >> ------------------------------------------
>> >> Shlomi Fish http://www.shlomifish.org/
>> >>
>> >> Electrical Engineering studies. In the Technion. Been there. Done
>> >> that. Forgot a lot. Remember too much.
>> >>
>> >> _______________________________________________
>> >> Linux-il mailing list
>> >> Linux-il at cs.huji.ac.il
>> >> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
>> >
>> > Hi Shlomi,
>> > You need to edit 2 files:
>> > 1. edit /etc/ssh/sshd_config and add the line 'UseDNS no'
>> > 2. edit /etc/nsswitch.conf and make sure the line:
>> >  'hosts:          files dns'
>> > have just the 'files' and 'dns'. delete everything else from this line.
>> >
>> > This will make ssh instant!
>> >
>>
>> Thanks for your advice. I added these suggestions on both hosts and
>> restarted sshd but I'm still getting the delays in typing the bash
>> commands on ssh and gringotts is still slow.
>>
>> Regards,
>>
>> -- Shlomi Fish
>>
>> > Kfir
>> >
>> >
>>
>>
>>
>> --
>> ------------------------------------------
>> Shlomi Fish http://www.shlomifish.org/
>>
>> Electrical Engineering studies. In the Technion. Been there. Done
>> that. Forgot a lot. Remember too much.
>>
>> _______________________________________________
>> Linux-il mailing list
>> Linux-il at cs.huji.ac.il
>> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
>
>



-- 
------------------------------------------
Shlomi Fish http://www.shlomifish.org/

Electrical Engineering studies. In the Technion. Been there. Done
that. Forgot a lot. Remember too much.