I'm a novice and I have maybe stupid two questions.
How can I dump and display (real time) incoming and outgoing traffic on the interface (or all interfaces) ?.For example: typical view from tcpdump.
~# tcpdump -n host 193.165.XXX.XXX and port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
11:31:03.161906 IP 193.165.xxx.xxx.52653 > 193.165.xxx.xxx.80: Flags
, seq 3021987991, win 8192, options [mss 1314,nop,wscale 2,nop,nop,sackOK], length 0
11:31:03.161972 IP 193.165.xxx.xxx.80 > 193.165.xxx.xxx.52653: Flags [S.], seq 21024193, ack 3021987992, win 5840, options [mss 1460,nop,nop,sackOK,nop,wscale 5], length 0
11:31:03.919630 IP 193.165.xxx.xxx.52653 > 193.165.xxx.xxx.80: Flags [.], ack 1, win 16425, length 0
11:31:03.930313 IP 193.165.xxx.xxx.52653 > 193.165.xxx.xxx.80: Flags [P.], seq 1:368, ack 1, win 16425, length 367
11:31:03.930367 IP 193.165.xxx.xxx.80 > 193.165.209.xxx.52653: Flags [.], ack 368, win 216, length 0
11:31:07.207545 IP 193.165.xxx.xxx.80 > 193.165.209.xxx.52653: Flags [P.], seq 1:486, ack 368, win 216, length 485
11:31:07.488402 IP 193.165.xxx.xxx.52653 > 193.165.xxx.xxx.80: Flags [P.], seq 368:716, ack 486, win 16303, length 348
11:31:07.488445 IP 193.165.xxx.xxx.80 > 193.165.xxx.xxx.52653: Flags [.], ack 716, win 250, length 0
Could you write me please step by step how can I forward traffic from external (WAN - any) traffic to LAN (internal mailserver)
WAN - any (port 25) ---->| eht1/3 (184.108.40.206) ------- eth1/4(192.168.1.1)| --- mailserver(192.168.1.10)
Thanks for your help.
You can dump traffic with a few sets of commands. You'll have to setup a debug dataplane packet-capture, and then view-pcap follow yes filter-pcap name.pcap. You could also scp or tftp that pcap to your desktop and view it in Wireshark.
You would want to setup a NAT rule to get mail from the Internal to your Internal network. (Don't forget you're security rule too!)
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