The waiting time is about 50s on my CentOS box now. "yum remove openssh* "and "yum install openssh*" can't make it right. "mv ~/.ssh{,.bak}" not works either. Here comes my tcpdump log, I am not an expert on SSH, Can anyone here get me out of this?
Thanks Ryan
[root@centos5u2 ~]# tcpdump -s 1520 -nn port 22 tcpdump: WARNING: peth0: no IPv4 address assigned tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on peth0, link-type EN10MB (Ethernet), capture size 1520 bytes 18:53:04.999533 IP 192.168.7.24.52315 > 192.168.7.252.22: S 1156562748:1156562748(0) win 5840 <mss 1460,sackOK,timestamp 5097684 0,nop,wscale 7> 18:53:04.999610 IP 192.168.7.252.22 > 192.168.7.24.52315: S 875773864:875773864(0) ack 1156562749 win 5792 <mss 1460,sackOK,timestamp 20270023 5097684,nop,wscale 7> 18:53:04.999654 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 1 win 46 <nop,nop,timestamp 5097684 20270023> 18:53:05.007974 IP 192.168.7.252.22 > 192.168.7.24.52315: P 1:21(20) ack 1 win 46 <nop,nop,timestamp 20270032 5097684> 18:53:05.008090 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 21 win 46 <nop,nop,timestamp 5097687 20270032> 18:53:05.008344 IP 192.168.7.24.52315 > 192.168.7.252.22: P 1:21(20) ack 21 win 46 <nop,nop,timestamp 5097688 20270032> 18:53:05.008471 IP 192.168.7.252.22 > 192.168.7.24.52315: . ack 21 win 46 <nop,nop,timestamp 20270032 5097688> 18:53:05.008715 IP 192.168.7.24.52315 > 192.168.7.252.22: P 21:733(712) ack 21 win 46 <nop,nop,timestamp 5097688 20270032> 18:53:05.009062 IP 192.168.7.252.22 > 192.168.7.24.52315: . ack 733 win 57 <nop,nop,timestamp 20270033 5097688> 18:53:05.009908 IP 192.168.7.252.22 > 192.168.7.24.52315: P 21:725(704) ack 733 win 57 <nop,nop,timestamp 20270033 5097688> 18:53:05.010074 IP 192.168.7.24.52315 > 192.168.7.252.22: P 733:757(24) ack 725 win 57 <nop,nop,timestamp 5097688 20270033> 18:53:05.012850 IP 192.168.7.252.22 > 192.168.7.24.52315: P 725:877(152) ack 757 win 57 <nop,nop,timestamp 20270036 5097688> 18:53:05.014563 IP 192.168.7.24.52315 > 192.168.7.252.22: P 757:901(144) ack 877 win 68 <nop,nop,timestamp 5097689 20270036> 18:53:05.037296 IP 192.168.7.252.22 > 192.168.7.24.52315: P 877:1597(720) ack 901 win 68 <nop,nop,timestamp 20270061 5097689> 18:53:05.039423 IP 192.168.7.24.52315 > 192.168.7.252.22: P 901:917(16) ack 1597 win 79 <nop,nop,timestamp 5097695 20270061> 18:53:05.079686 IP 192.168.7.252.22 > 192.168.7.24.52315: . ack 917 win 68 <nop,nop,timestamp 20270103 5097695> 18:53:05.079723 IP 192.168.7.24.52315 > 192.168.7.252.22: P 917:965(48) ack 1597 win 79 <nop,nop,timestamp 5097705 20270103> 18:53:05.079857 IP 192.168.7.252.22 > 192.168.7.24.52315: . ack 965 win 68 <nop,nop,timestamp 20270104 5097705> 18:53:05.079933 IP 192.168.7.252.22 > 192.168.7.24.52315: P 1597:1645(48) ack 965 win 68 <nop,nop,timestamp 20270104 5097705> 18:53:05.080312 IP 192.168.7.24.52315 > 192.168.7.252.22: P 965:1029(64) ack 1645 win 79 <nop,nop,timestamp 5097706 20270104> 18:53:05.082778 IP 192.168.7.252.22 > 192.168.7.24.52315: P 1645:1725(80) ack 1029 win 68 <nop,nop,timestamp 20270106 5097706> 18:53:05.120169 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 1725 win 79 <nop,nop,timestamp 5097716 20270106>
18:54:15.679137 IP 192.168.7.24.52315 > 192.168.7.252.22: P 1029:1173(144) ack 1725 win 79 <nop,nop,timestamp 5115354 20270106> 18:54:15.681497 IP 192.168.7.252.22 > 192.168.7.24.52315: P 1725:1757(32) ack 1173 win 79 <nop,nop,timestamp 20340699 5115354> 18:54:15.681533 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 1757 win 79 <nop,nop,timestamp 5115355 20340699> 18:54:15.681887 IP 192.168.7.24.52315 > 192.168.7.252.22: P 1173:1237(64) ack 1757 win 79 <nop,nop,timestamp 5115355 20340699> 18:54:15.685510 IP 192.168.7.252.22 > 192.168.7.24.52315: P 1757:1805(48) ack 1237 win 79 <nop,nop,timestamp 20340703 5115355> 18:54:15.685763 IP 192.168.7.24.52315 > 192.168.7.252.22: P 1237:1685(448) ack 1805 win 79 <nop,nop,timestamp 5115356 20340703> 18:54:15.701415 IP 192.168.7.252.22 > 192.168.7.24.52315: P 1805:1853(48) ack 1685 win 90 <nop,nop,timestamp 20340719 5115356> 18:54:15.701472 IP 192.168.7.252.22 > 192.168.7.24.52315: P 1853:1949(96) ack 1685 win 90 <nop,nop,timestamp 20340719 5115356> 18:54:15.701588 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 1949 win 79 <nop,nop,timestamp 5115360 20340719> 18:54:15.840022 IP 192.168.7.252.22 > 192.168.7.24.52315: P 1949:2013(64) ack 1685 win 90 <nop,nop,timestamp 20340858 5115360> 18:54:15.840076 IP 192.168.7.252.22 > 192.168.7.24.52315: P 2013:2061(48) ack 1685 win 90 <nop,nop,timestamp 20340858 5115360> 18:54:15.840188 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 2061 win 79 <nop,nop,timestamp 5115394 20340858> 18:54:15.844887 IP 192.168.7.252.22 > 192.168.7.24.52315: P 2061:2125(64) ack 1685 win 90 <nop,nop,timestamp 20340862 5115394> 18:54:15.884608 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 2125 win 79 <nop,nop,timestamp 5115406 20340862> 18:55:15.170913 IP 192.168.7.24.52315 > 192.168.7.252.22: P 1685:1733(48) ack 2125 win 79 <nop,nop,timestamp 5130226 20340862> 18:55:15.171562 IP 192.168.7.252.22 > 192.168.7.24.52315: P 2125:2173(48) ack 1733 win 90 <nop,nop,timestamp 20400184 5130226> 18:55:15.171574 IP 192.168.7.252.22 > 192.168.7.24.52315: P 2173:2237(64) ack 1733 win 90 <nop,nop,timestamp 20400184 5130226> 18:55:15.171579 IP 192.168.7.252.22 > 192.168.7.24.52315: P 2237:2301(64) ack 1733 win 90 <nop,nop,timestamp 20400184 5130226> 18:55:15.171633 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 2173 win 79 <nop,nop,timestamp 5130226 20400184> 18:55:15.171639 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 2237 win 79 <nop,nop,timestamp 5130226 20400184> 18:55:15.171644 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 2301 win 79 <nop,nop,timestamp 5130226 20400184> 18:55:17.155112 IP 192.168.7.24.52315 > 192.168.7.252.22: P 1733:1781(48) ack 2301 win 79 <nop,nop,timestamp 5130722 20400184> 18:55:17.155432 IP 192.168.7.252.22 > 192.168.7.24.52315: P 2301:2349(48) ack 1781 win 90 <nop,nop,timestamp 20402168 5130722> 18:55:17.155471 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 2349 win 79 <nop,nop,timestamp 5130722 20402168> 18:55:17.155814 IP 192.168.7.252.22 > 192.168.7.24.52315: P 2349:2413(64) ack 1781 win 90 <nop,nop,timestamp 20402168 5130722> 18:55:17.155851 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 2413 win 79 <nop,nop,timestamp 5130722 20402168> 18:55:17.155860 IP 192.168.7.252.22 > 192.168.7.24.52315: P 2413:2477(64) ack 1781 win 90 <nop,nop,timestamp 20402168 5130722> 18:55:17.155891 IP 192.168.7.24.52315 > 192.168.7.252.22: . ack 2477 win 79 <nop,nop,timestamp 5130722 20402168>
50 packets captured 100 packets received by filter 0 packets dropped by kernel [root@centos5u2 ~]# [root@centos5u2 ~]#