Static Jail ID's (JID's) for use with IPFW?

[Karl Pielorz]

Hi,

I have a number of jailed systems running - and I've been setting up ipfw 
rules for them.

This is on FBSD 9.1.

'ipfw' lets you match on traffic to/from a Jail ID (JID) - however every 
time jails get started / stopped their JID changes [thus breaking the 
firewall rules].

I can't see anywhere to 'statically' configure a JID to a Jail (i.e. in 
/etc/rc.conf).

Is this possible? / How?

Thanks,

-Karl