Kolusion K:
> Ok, I did what you asked and I got this:
>
> reading from file dump.txt, link-type LINUX_SLL (Linux cooked v1)
> 23:11:23.019120 IP 192.168.2.2.40415 > 47.246.137.47.smtp: Flags [S], seq
> 3300139944, win 65280, options [mss 1360,sackOK,TS val 912070706 ecr
> 0,nop,wscale 7], length 0
> 23:11:24.037250 IP 192.168.2.2.40415 > 47.246.137.47.smtp: Flags [S], seq
> 3300139944, win 65280, options [mss 1360,sackOK,TS val 912071724 ecr
> 0,nop,wscale 7], length 0
> 23:11:26.054636 IP 192.168.2.2.40415 > 47.246.137.47.smtp: Flags [S], seq
> 3300139944, win 65280, options [mss 1360,sackOK,TS val 912073742 ecr
> 0,nop,wscale 7], length 0
> 23:11:30.158588 IP 192.168.2.2.40415 > 47.246.137.47.smtp: Flags [S], seq
> 3300139944, win 65280, options [mss 1360,sackOK,TS val 912077846 ecr
> 0,nop,wscale 7], length 0
> 23:11:38.333669 IP 192.168.2.2.40415 > 47.246.137.47.smtp: Flags [S], seq
> 3300139944, win 65280, options [mss 1360,sackOK,TS val 912086021 ecr
> 0,nop,wscale 7], length 0
Presumably this is Postfix trying to connect.
The TCP/IP stack sends SYN packets
- from source IP address 192.168.2.2 (chosen by Postfix or by TCP/IP stack)
- from source port 40415 (chosen by TCP/IP stack)
- to destination IP address 47.246.137.47 port 25 (both chosen by Postfix)
and times out because the TCP/IP stack receives no SYN+ACK response.
What is the result when you connect to the same host using telnet?
You may be to specify a different '-i' option in the tdpcump command.
> 23:11:53.050567 IP 192.168.2.2.41905 > cz-clare.com.smtp: Flags [S], seq
> 3744182035, win 65280, options [mss 1360,sackOK,TS val 2086976875 ecr
> 0,nop,wscale 7], length 0
> ...etc...
Same problem, with source IP address 192.168.2.2 and port 41905.
> 23:12:23.115056 IP 192.168.2.2.45487 > 47.246.99.195.smtp: Flags [S], seq
> 757318789, win 65280, options [mss 1360,sackOK,TS val 2582719398 ecr
> 0,nop,wscale 7], length 0
> ...etc...
Same problem, with source IP address 192.168.2.2 and 45487.
A recording for a successful telnet connection would be illustrative.
Wietse
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