How to capture and analyze IPSEC traffic or why do I see un-encrypted packets going through an IPSEC tunnel
Issue
- While running Openswan VPN is it possible to troubleshoot VPN traffic that flows into the
ipsectunnel? - Apparently using
tcpdumpit's not possible to see the traffic going into the tunnel. - Is it somehow possible to trace traffic that goes into the tunnel or is rejected/dropped by the tunnel?
Environment
- Red Hat Enterprise Linux
ipsectunnel based on Openswan
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