Jails not being assigned IP address?

[Matt Bostock]

Hello,

I have three jails on one machine that won't resolve DNS because it looks as
though the jails themselves aren't being assigned IP addresses. When I run
ifconfig, none of the adapters have IPs assigned.

The host is working fine. Can anyone explain why the jails aren't being assigned
IPs? Would they fail to be assigned if an adapter on the host already has their
IPs as aliases?

Any advice is much appreciated,
Matt