Tunnel setup: what happens when my IPv4 address changes?

Pierre Abbat phma at bezitopo.org
Mon Jun 10 20:54:36 PDT 2013

I came home and found the power off. It came back on a short while later, and I 
spent about two hours fixing the mess. I intended to reboot zyxomma (my new 
firewall) to see if I got its configuration right. After much fiddling, I got it 
to come up right when rebooted. Here are the relevant lines of rc.conf:

ifconfig_em1="inet netmask"
ifconfig_em1_alias0="inet6 2001:470:8:42::2 prefixlen 64"
ifconfig_gif0="inet6 2001:470:7:42::2 2001:470:7:42::1 prefixlen 128"

The problem is that the first address in the gifconfig statement has to be 
whatever address em0 gets from DHCP. The commented-out address is the one the 
old router got. How do I write this line so that it works even if I get a 
different address? (Telling Tunnelbroker the new address is a different problem; 
there are instructions on tunnelbroker.net.) The command that netif runs is 
"ifconfig gif0 tunnel".

The Black Garden on the Mountain is not on the Black Mountain.

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