Date: 13 Aug 2001 14:36:30 +0200 From: drt@un.bewaff.net (Doobee R. Tzeck) To: freebsd-questions@freebsd.org Subject: FreeBSD Host which can't communicate with itself. Message-ID: <87zo94t9v5.fsf@c0re.rc23.cx>
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I have 4.2 host which can't sucessfully connect to itself via TCP. ICMP and UDP works. So I can send and recive data to all local interfaces (lo0 and xl0) if it is UDP or ICMP. But it I try to establish an TCP connection, it times out. Connectivity to other hosts works great. Any hints into what I should look to nail the Problem? drt Demonstration of the Probelm: drt@c0re:~> ping -c 1 localhost PING localhost (127.0.0.1): 56 data bytes 64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=0.194 ms --- localhost ping statistics --- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.194/0.194/0.194/0.000 ms [other console] drt@c0re:~> nc -l -u -p 1234 drt@c0re:~> sudo /usr/local/sbin/lsof -i -n | grep 1234 Password: nc 52643 drt 3u IPv4 0xc9e5dd80 0t0 UDP *:1234 drt@c0re:~> nc -u localhost 1234 hallo ^C punt! [other console] hallo drt@c0re:~> nc -l -p 12345 localhost [waits forever, or at least several dozend minutes] [other console] drt@c0re:~/rt-2-0-4> sudo /usr/local/sbin/lsof -i -n |grep 1234 nc 55873 drt 3u IPv4 0xca2dbb60 0t0 TCP *:12345 (LISTEN) nc 55888 root 3u IPv4 0xca2e20c0 0t0 TCP 127.0.0.1:3158->127.0.0.1:1234 (SYN_SENT) ktrace of the connecting nc shows: 55888 nc CALL connect(0x3,0x807c080,0x10) 55888 nc RET connect -1 errno 60 Operation timed out drt@c0re:~> sudo /sbin/ipfw show Password: 65535 54044251 5641476290 allow ip from any to any ## Dynamic rules: 00000 0 0 (T 0, # 0) ty 0 ip, 0.0.0.0 0 <-> 0.0.0.0 0 FreeBSD c0re.rc23.cx 4.2-STABLE FreeBSD 4.2-STABLE #0: Fri Feb 23 00:35:37 CET 2001 root@c0re.rc23.cx:/usr/src/sys/compile/C0RE i386 drt@c0re:~> sudo /sbin/sysctl -a |grep net.inet.tcp net.inet.tcp.rfc1323: 0 net.inet.tcp.rfc1644: 0 net.inet.tcp.mssdflt: 512 net.inet.tcp.keepidle: 7200000 net.inet.tcp.keepintvl: 75000 net.inet.tcp.sendspace: 16384 net.inet.tcp.recvspace: 16384 net.inet.tcp.keepinit: 75000 net.inet.tcp.delacktime: 100 net.inet.tcp.v6mssdflt: 1024 net.inet.tcp.log_in_vain: 1 net.inet.tcp.blackhole: 0 net.inet.tcp.delayed_ack: 1 net.inet.tcp.tcp_lq_overflow: 1 net.inet.tcp.restrict_rst: 1 net.inet.tcp.path_mtu_discovery: 0 net.inet.tcp.slowstart_flightsize: 1 net.inet.tcp.local_slowstart_flightsize: 65535 net.inet.tcp.tcbhashsize: 512 net.inet.tcp.pcbcount: 27 net.inet.tcp.msl: 30000 net.inet.tcp.always_keepalive: 1 -- Aber wenn man es genau nimmt, ist UNIX auch nur ein verherrlichtes Telespiel. Niemand arbeitet auf UNIX-Systemen an ernsthaften Dingen - man schickt kleine Witzchen ueber das USENET rund um die Welt oder schreibt ein neues Adventure- Spiel oder Forschungsberichte. http://koeln.ccc.de/~drt/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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