Date: Mon, 12 Oct 1998 09:25:16 +0200 (CEST) From: Reinier Bezuidenhout <Reinier.Bezuidenhout@KryptoKom.DE> To: hackers@FreeBSD.ORG Subject: ttcp and 2.2.7 Message-ID: <199810120725.JAA01598@borg.kryptokom.de>
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Hi ... I have two systems on which I tried to run ttcp. Both are 2.2.7 systems. I have a version of ttcp compiled on a 2.1.7 system and one compiled on the above 2.2.7-STABLE system. The following strangeness appears when using the 2.2.7 compiled ttcp and -u (UDP) option. It seems that the transmitting side just keeps on sending udp packets of size 4 ... (the packets that tell the receiving side the transmitting is starting) ... the receiving side then just exits because it received both the start and end sequences of packets (these small udp) packets. When using the version of ttcp compiled on the 2.1.7 system .. it works fine without any problems. Were there some major changes in the way the udp is handled ??? that causes ttcp to behave strangely ?? I've tried this on different hardware platforms with different ethernet cards (fxp / de / xl) same thing happens. tcpdump just shows hundreds op udp packets size 4 being transmitted the whole time ... The following is the output from ttcp This one never stops until killed ... ~/ttcp> ./ttcp -t -u -s 10.0.1.101 ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001 udp -> 10.0.1.101 ttcp-t: socket ^C ~/ttcp> The receiving side exits almos immediately ... ~/ttcp> ./ttcp -r -s -u ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 udp ttcp-r: socket ttcp-r: 0 bytes in 0.00 real seconds = 0.00 KB/sec +++ ttcp-r: 2 I/O calls, msec/call = 0.02, calls/sec = 54054.05 ttcp-r: 0.0user 0.0sys 0:00real 0% 0i+0d 0maxrss 0+0pf 0+0csw ~/ttcp> Any ideas ... Thanx Reinier To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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