Steve Watt wrote:
One of my users is having trouble receiving mail from Skype. So, after some sniffing, I discovered this:# tcpdump -vv -s 1500 -i dc0 -X net 213.244.128.0/18 tcpdump: lestening on dc0, link-type EN10MB (Ethernet), capture size 1500 bytes 13:18:13.607493 IP (tos 0x20, ttl 58, id 12896, offset 0, flags [DF], proto: TCP (6), length: 74) share.skype.net.50406 > wattres.watt.com.smtp: P, cksum 0x9297 (correct), 4072464914:4072464936(22) ack 1248591103 win 46 <nop,nop,timestamp 2511885672 520058954> 0x0000: 4520 004a 3260 4000 3a06 c609 d5f4 aa50 [EMAIL PROTECTED]:......P 0x0010: 425d 8582 c4e6 0019 f2bc e212 4a6b fcff B]..........Jk.. 0x0020: 8018 002e 9297 0000 0101 080a 95b8 5568 ..............Uh 0x0030: 1eff 784a 4548 4c4f 2073 6861 7265 2e73 ..xJEHLO.share.s 0x0040: 6b79 7065 2e6e 6574 0d0a kype.net.. 0x0000: 4520 004a 3261 4000 3a06 c608 d5f4 aa50 [EMAIL PROTECTED]:......P 0x0010: 425d 8582 c4e6 0019 f2bc e212 4a6b fcff B]..........Jk.. 0x0020: 8018 002e 1d67 0000 0101 080a 95b8 ca98 .....g.......... 0x0030: 1eff 784a 4548 4c4f 2073 6861 7265 2e73 ..xJEHLO.share.s 0x0040: 6b79 7065 2e6e 6574 0d0a kype.net.. And no responses from my system. Interesting. I presume it has something to do with the idiotically small window the remote server is advertising. So I set net.inet.tcp.minmss down to 46, and that resulted in a RST being spit back to skype's server when its retransmit happened. [...]
turn off window scaling (I forget the sysctl) and see if that helps It's broken in some versions of freeBSD at least. _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
