initial subset of the following list of items:
* A 32-bit integer with a set of capability flags, representing the
abilities of the sender.
+ * In MSG3/MSG4: a 16-bit integer being the sender's MTU, or zero.
+ (In other messages: nothing.) See below.
* More data which is yet to be defined and which must be ignored
by receivers.
The optional additional data after the receiver's name is not
should be treated as late ones.
+MTU handling
+
+In older versions of secnet, secnet was not capable of fragmentation
+or sending ICMP Frag Needed. Administrators were expected to configure
+consistent MTUs across the network.
+
+It is still the case in the current version that the MTUs need to be
+configured reasonably coherently across the network: the allocated
+buffer sizes must be sufficient to cope with packets from all other
+peers.
+
+However, provided the buffers are sufficient, all packets will be
+processed properly: a secnet receiving a packet larger than the
+applicable MTU for its delivery will either fragment it, or reject it
+with ICMP Frag Needed.
+
+The MTU additional data field allows secnet to advertise an MTU to the
+peer. This allows the sending end to handle overlarge packets, before
+they are transmitted across the underlying public network. This can
+therefore be used to work around underlying network braindamage
+affecting large packets.
+
+If the MTU additional data field is zero or not present, then the peer
+should use locally-configured MTU information (normally, its local
+netlink MTU) instead.
+
+If it is nonzero, the peer may send packets up to the advertised size
+(and if that size is bigger than the peer's administratively
+configured size, the advertiser promises that its buffers can handle
+such a large packet).
+
+A secnet instance should not assume that just because it has
+advertised an mtu which is lower than usual for the vpn, the peer will
+honour it, unless the administrator knows that the peers are
+sufficiently modern to understand the mtu advertisement option. So
+secnet will still accept packets which exceed the link MTU (whether
+negotiated or assumed).
+
+
Messages:
1) A->B: *,iA,msg1,A+,B+,nA