From owner-freebsd-jail@FreeBSD.ORG  Fri Jun 29 08:25:56 2007
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Date: Fri, 29 Jun 2007 10:25:54 +0200
From: Roger Gujord <roger@gujord.com>
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Subject: Re: Different Netmasks for jails
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UPDATE:
-------

I managed to do what I wanted by adding the following to /etc/rc.d/jail:

# init_variables _j
eval _netmask=\"\$jail_${_j}_netmask\"

# Debugging aid
debug "$_j netmask: $_netmask"
...
if [ -z "${_netmask}" ]; then
    err 3 "$name: No netmask has been defined for ${_j}"
fi

# jail_start()
ifconfig ${_interface} alias ${_ip} netmask ${_netmask}

and the following for each jail in /etc/rc.conf:
jail_jailname_netmask="xxx.xxx.xxx.xxx"

I'm not sure if this is the proper way to do it, but it seems to work for me.

--Roger