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     АРХИВ :: Inet-Admins
Inet-Admins mailing list archive (inet-admins@info.east.ru)

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[inet-admins] Odd packet sizes?



Вот блин на грабли наступил:

[Tue Oct 12 09:47:48]
root@hades [71:559 /tmp/com/] # ping -s 1214 196.22.173.5
PING 196.22.173.5 (196.22.173.5): 1214 data bytes
1222 bytes from 196.22.173.5: icmp_seq=0 ttl=255 time=10.646 ms
1222 bytes from 196.22.173.5: icmp_seq=1 ttl=255 time=10.029 ms
--- 196.22.173.5 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 10.029/10.337/10.646 ms
[Tue Oct 12 09:47:52]
root@hades [72:560 /tmp/com/] # ping -s 1213 196.22.173.5
PING 196.22.173.5 (196.22.173.5): 1213 data bytes
--- 196.22.173.5 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss
[Tue Oct 12 09:47:55]
root@hades [73:561 /tmp/com/] # ping -s 1213 196.22.173.1
PING 196.22.173.1 (196.22.173.1): 1213 data bytes
1221 bytes from 196.22.173.1: icmp_seq=0 ttl=255 time=7.572 ms
1221 bytes from 196.22.173.1: icmp_seq=1 ttl=255 time=7.520 ms
--- 196.22.173.1 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 7.520/7.546/7.572 ms

И такая фигня - вплоть то 1474. Пакетами нечётного размера не пингуется. Что
за нафиг?

На 196.22.173.5 - IOS (tm) 1600 Software (C1600-SY-L), Version 12.0(4),
RELEASE SOFTWARE (fc1)

На 196.22.173.1 - Livingston Portmaster.

Вот ещё интересная фигня - при размере 1473 не пингуется ни киска, ни
ливингстон. 1471 - всё опять как прежде - лив пингуется, киса - нет.

Это к чему?
-- 
   (KD1350) CCNA                                     Dmitri E. Kalintsev
   CDPlayer@irc            Senior network engineer at NetActive Internet
   dek @ hades.uz                phone: +27 (0)11 719-0333 fax: 444-8900
   http://hades.uz                 UIN:7150410  cell  +27 (0)82-336-1033
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