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Date: Mon, 15 Jan 2007 17:25:37 +0300 From: Michael Tokarev <mjt@....msk.ru> To: unlisted-recipients:; (no To-header on input) CC: Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org Subject: Re: rare bad TCP checksum with 2.6.19? Michael Tokarev wrote: [] > And another thing I noticed. Right now I'm experimenting with another > machine, running 2.6.17(.13) - it also shows similar behavior with bad > csums, but MUCH rarer than this 2.6.19. Like this: > > 16:29:32.490976 IP (tos 0x60, ttl 48, id 14110, offset 0, flags [DF], length: 80) > 69.42.67.34.2612 > 81.13.94.6.1234: . [bad tcp cksum f4b4 (->c1cc)!] ack 93407 win 9821 > <nop,nop,timestamp 1046528199 5497679,nop,nop,sack sack 3 {104991:109335}{110783:112231}{104991:109335} > This seems to be a tcpdump bug. At least the same packet(s), on another machine (in-between the two), with updated tcpdump, shows as having correct checksum. After updating tcpdump on this machine, I'm not seeing this 'sack bad cksum' stuff anymore. /mjt - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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