Hello,
In the last days I can ssh from 219.136.252.59 to 211.66.80.167 without any problem.
But this afternoon I couldn't login it any more.
I run this tcpdump command on 219.136.252.59:
tcpdump host 211.66.80.167 -s0 -v
and open another shell to login to 211.66.80.167:
ssh 211.66.80.167
(the result is: ssh command was staying there,no any output.)
These are tcpdump's output:
20:43:33.237538 IP (tos 0x0, ttl 64, id 50635, offset 0, flags [DF], proto TCP (6), length 60) 219.136.252.59.49163 > 211.66.80.167.ssh: S, cksum 0xba14 (correct), 3038612078:3038612078(0) win 5840 <mss 1460,sackOK,timestamp 739921829 0,nop,wscale 7>
20:43:33.257690 IP (tos 0x0, ttl 52, id 0, offset 0, flags [DF], proto TCP (6), length 60) 211.66.80.167.ssh > 219.136.252.59.49163: S, cksum 0x2059 (correct), 1588559619:1588559619(0) ack 3038612079 win 5792 <mss 1460,sackOK,timestamp 3849197 739921829,nop,wscale 7>
20:43:33.257700 IP (tos 0x0, ttl 64, id 50636, offset 0, flags [DF], proto TCP (6), length 52) 219.136.252.59.49163 > 211.66.80.167.ssh: ., cksum 0x6592 (correct), ack 1 win 46 <nop,nop,timestamp 739921834 3849197>
20:43:33.282677 IP (tos 0x0, ttl 52, id 50422, offset 0, flags [DF], proto TCP (6), length 72) 211.66.80.167.ssh > 219.136.252.59.49163: P, cksum 0xb1c9 (correct), 1:21(20) ack 1 win 46 <nop,nop,timestamp 3849204 739921834>
20:43:33.282689 IP (tos 0x0, ttl 64, id 50637, offset 0, flags [DF], proto TCP (6), length 52) 219.136.252.59.49163 > 211.66.80.167.ssh: ., cksum 0x6571 (correct), ack 21 win 46 <nop,nop,timestamp 739921840 3849204>
20:43:33.282756 IP (tos 0x0, ttl 64, id 50638, offset 0, flags [DF], proto TCP (6), length 72) 219.136.252.59.49163 > 211.66.80.167.ssh: P, cksum 0xfbe8 (incorrect (-> 0xb1af), 1:21(20) ack 21 win 46 <nop,nop,timestamp 739921840 3849204>
20:43:33.303665 IP (tos 0x0, ttl 52, id 50423, offset 0, flags [DF], proto TCP (6), length 52) 211.66.80.167.ssh > 219.136.252.59.49163: ., cksum 0x6558 (correct), ack 21 win 46 <nop,nop,timestamp 3849209 739921840>
20:43:33.303671 IP (tos 0x0, ttl 64, id 50639, offset 0, flags [DF], proto TCP (6), length 844) 219.136.252.59.49163 > 211.66.80.167.ssh: P, cksum 0xfeec (incorrect (-> 0x1c1b), 21:813(792) ack 21 win 46 <nop,nop,timestamp 739921845 3849209>
20:43:33.362633 IP (tos 0x0, ttl 52, id 50425, offset 0, flags [DF], proto TCP (6), length 52) 211.66.80.167.ssh > 219.136.252.59.49163: ., cksum 0x5f10 (correct), ack 813 win 58 <nop,nop,timestamp 3849224 739921845>
As you see, there are two incorrect checksum.
So, what wrong with 211.66.80.167? How can I resolve it?
Thanks a lot in advance.
Regards.
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