Doesn't IPSec operate at the same level as TCP/UDP? TCP is protocol 6, UDP proto... | Hacker News

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		xav0989 on Nov 13, 2020 \| parent \| context \| favorite \| on: Why TCP over TCP is a bad idea (2001) Doesn't IPSec operate at the same level as TCP/UDP? TCP is protocol 6, UDP protocol 17; while IPsec uses protocol 50 for ESP (encrypted) and 51 for AH (authenticated).

amaccuish on Nov 13, 2020 [–]

IPSEC can operate in both modes, either as a pure IP protocol or in "nat traversal" mode, over IIRC udp 500 and 4500

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