Re: Losing routing when dhcp client renews with new IP

["Perrier,Kent - PLANO" <Kent_(_dot_)_Perrier_(_at_)_Oneco_(_dot_)_net>]

Dennis Schoen wrote:

> On Tue, Mar 27, 2001 at 08:20:15PM -0600, Perrier,Kent - PLANO wrote:
>
> > I have searched the archive at sigmasoft and I know I am probably
> > searching for the wrong key word, so I am asking here.  My OpenBSD
> > box is serving as a firewall/nat router.  My cable provider internet
> > service is provided by videon.  Everything works great until the
> > dhcp server renews my IP address lease with a different IP address.
> > At this point my ipnat rules don't work and I have to reboot in order
> > to get nat routing working again.
> >
> > Is there a programatic way to fix this?
>
> How about showing us your NAT Rules?

Sure.  Here thay are:
[/home/kperrier]$ cat /etc/ipnat.rules 
# $OpenBSD: ipnat.rules,v 1.2 1999/05/08 16:33:10 jason Exp $
#
# See /usr/share/ipf/nat.1 for examples.
# edit the ipnat= line in /etc/rc.conf to enable Network Address Translation

#map ppp0 10.0.0.0/8 -> ppp0/32 portmap tcp/udp 10000:20000

# Scenario: Two network interfaces; one connected to internal 192.168.0.XXX
# network, other connected externally to the Internet. Suppose the internal
# interface is named we2 and the external interface is named ep0. The
# following mapping will provide the internal network with Internet
# connectivity for tcp/udp traffic (note the we2 name is not used; instead
# its network address is used):
map ep0 192.168.0.0/24 -> ep0/32 portmap tcp/udp 10000:20000

[/home/kperrier]$ 

Nothing tremendously earthshattering here.  What does not get updated
is the default route, i.e. what 'route show' or 'netstat -rn' prints
out.  I don't think my nat rules are the problem, is the routing table.

Would using routed fix the problem by dynamically updating my
routing table when my IP changes?

Kent
--
You can never entirely stop being what you once were. That's
why it's important to be the right person today, and not put
it off till tomorrow.
                       -- Larry Wall, 3rd State of the Onion