Delays in ssh connections between two local Linux computers

[Shlomi Fish]

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.