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-
-Here documents known IPsec corner cases which need to be keep in mind when
-deploy various IPsec configuration in real world production environment.
-
-1. IPcomp: Small IP packet won't get compressed at sender, and failed on
- policy check on receiver.
-
-Quote from RFC3173:
-2.2. Non-Expansion Policy
-
- If the total size of a compressed payload and the IPComp header, as
- defined in section 3, is not smaller than the size of the original
- payload, the IP datagram MUST be sent in the original non-compressed
- form. To clarify: If an IP datagram is sent non-compressed, no
-
- IPComp header is added to the datagram. This policy ensures saving
- the decompression processing cycles and avoiding incurring IP
- datagram fragmentation when the expanded datagram is larger than the
- MTU.
-
- Small IP datagrams are likely to expand as a result of compression.
- Therefore, a numeric threshold should be applied before compression,
- where IP datagrams of size smaller than the threshold are sent in the
- original form without attempting compression. The numeric threshold
- is implementation dependent.
-
-Current IPComp implementation is indeed by the book, while as in practice
-when sending non-compressed packet to the peer (whether or not packet len
-is smaller than the threshold or the compressed len is larger than original
-packet len), the packet is dropped when checking the policy as this packet
-matches the selector but not coming from any XFRM layer, i.e., with no
-security path. Such naked packet will not eventually make it to upper layer.
-The result is much more wired to the user when ping peer with different
-payload length.
-
-One workaround is try to set "level use" for each policy if user observed
-above scenario. The consequence of doing so is small packet(uncompressed)
-will skip policy checking on receiver side.