extra interfaces in singlehost-setup.sh

[Steve Elkins <sgelkins@nortelnetworks.com>]

Hi,

On 3.0 GENERIC, I'm looking at

   /usr/share/ipsec/isakmpd/singlehost-setup.sh 

and scratching my head about the ifconfig lines.  It doesn't seem hard
to change the script from ipf to pfctl, but

   ifconfig lo2 192.168.11.1 netmask 0xffffff00

and friends (lo3, lo4, lo5) give me

   ifconfig: SIOCGIFFLAGS: Device not configured

in and out of the script, so I haven't really reached the pfctl part.
ifconfig -a starts

   lo0: flags=8009<UP,LOOPBACK,MULTICAST> mtu 33224
           inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4
           inet6 ::1 prefixlen 128
           inet 127.0.0.1 netmask 0xff000000 
   lo1: flags=8008<LOOPBACK,MULTICAST> mtu 33224
   xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   etc.

and that lo1 is intriguing, but I can't find it anywhere.  It isn't in
/etc/netstart (lo0 is), nor the GENERIC config file.  In config

   UKC> find lo

doesn't find anything, so I don't see how to add a device the way the
config man page does ne1.

It should be obvious by now that I don't know what I'm doing.  A few
questions

1. Am I correct that I need to add these devices (lo2 - lo5) somehow
   to make progress with the isakmpd example?

2. If so, how do I do it?

3. If not, what should I do instead?

4. Where did lo1 originate?

Thanks,
Steve