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With some safe reasons, I need to sniff pptp cleint request packets, then to get dst ip and src ip, for example -> , I want to know the correct rule in tcpdump

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up vote 0 down vote accepted

tcpdump -i ethN port 1723 -vvv

Assuming that you literally just want to see the connection information and not run a packet cap.

Replacing ethN with the appropriate interface.

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