ssh - mrtvy brouk - VYRESENO

[oldfrog.linux na volny.cz]

Milan Kerslager wrote:

>>>pripojuji se sshckem pres wifi siti ke zdalenemu stroji
>>>a obcas se stane, ze se ssh snazi propojit, nepise
>>>chybu, jen ceka, dela mrtveho brouka a teprve po
>>>      
>>>
>>Zda se, ze problem byl v samotnem wifi spoji,
>>sshcko neustalo nekvalitu spoje (ktera se ze
>>vseho nejmin projevila na pingu). Toz jsem
>>poucen...
>>    
>>
>Simulovat ping na TCP pro prenos dat muzete zvetsenim datagramu (pozor
>na fragmentaci):
>
>ping -s 1472 stroj.cil.cz
>
>Dalsi moznosti je vyuzit parametr -f (flood).
>
>Na dlouhych datagramech se lepe projevi nestabilita kvality linky
>(kratke projdou, dlouhe nikoliv). Pozor - pokud jsou cil okna a nejaka
>winroute, musite zmensit ping o dalsich asi 100B (asi jeji tvurci
>neumeji pocitat).
>

Ano, dekuji, zkousel jsem, stejne to ale nebylo nejak signifikantni
(podle me - viz nize), nicmene jsem jiz dospel na samotnou
dren problemu, kdyz jsem odstranil pricinu problemu (ruseni),
sshcko bezelo jak z praku. Mozna vadi spise nevyrovnany
ping, nejaka ta ztrata paketu (pod 10%):

1480 bytes from 192.168.0.49: icmp_seq=183 ttl=64 time=56.5 ms
1480 bytes from 192.168.0.49: icmp_seq=184 ttl=64 time=356 ms
1480 bytes from 192.168.0.49: icmp_seq=185 ttl=64 time=48.0 ms
1480 bytes from 192.168.0.49: icmp_seq=186 ttl=64 time=87.7 ms
1480 bytes from 192.168.0.49: icmp_seq=187 ttl=64 time=40.6 ms
1480 bytes from 192.168.0.49: icmp_seq=188 ttl=64 time=67.4 ms
1480 bytes from 192.168.0.49: icmp_seq=189 ttl=64 time=29.8 ms
1480 bytes from 192.168.0.49: icmp_seq=190 ttl=64 time=43.0 ms
1480 bytes from 192.168.0.49: icmp_seq=191 ttl=64 time=269 ms
1480 bytes from 192.168.0.49: icmp_seq=192 ttl=64 time=44.5 ms
1480 bytes from 192.168.0.49: icmp_seq=193 ttl=64 time=65.8 ms
1480 bytes from 192.168.0.49: icmp_seq=194 ttl=64 time=43.6 ms

--- 192.168.0.49 ping statistics ---
194 packets transmitted, 194 received, 0% packet loss, time 194706ms
rtt min/avg/max/mdev = 28.811/509.983/2129.367/496.287 ms, pipe 3

Pri tomto pingu si sshcko ani neskrtne... Nevim presne proc.


-- 
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Ondrej Nemecek
    alias 'OldFrog'

tel:     241766035
ICQ:     250163477
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