I'm not aware of any formal spec, but Michael
N6MEF's suggestion pretty
much
covers it. The only difference I've come across between implementations is
that some require a specific source port as well as the defined
destination
port.
FYI John, in case you aren't aware:
JNOS used to require that the source port for incoming packets be specified
when setting up the AXUDP interface in JNOS. Of course, that's very unusual
for IP protocols and also easily broken by firewalls. In JNOS 2.0j.5 (June
2014), Maiko added the option to specify "-1" for the incoming source port,
meaning "don't care". This is what I use with all AXUDP connections,
including to BPQ systems.
http://www.langelaar.net/projects/jnos2/documents/changes.txt
There seem to be two commonly used ports (93 and
10093).though others are
also used. Using low numbered ports can be a problem with some operating
systems (requiring root/admin rights) so I prefer 10093
Agreed.
Michael
N6MEF