* Additions to the test-example suite.
* SECURITY: Fixes to MTU and fragmentation handling.
* SECURITY: Correctly set "unused" ICMP header field.
+ * Do not send ICMP errors in response to unknown incoming ICMP.
+ * SECURITY: Fix IP length check not to crash on very short packets.
+ * Make the inter-site MTU configurable, and negotiate it with the peer.
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