Date: 23 Oct 2001 17:41:18 -0500 From: Kirk Strauser <kirk@strauser.com> To: freebsd-net@freebsd.org Subject: Silly problem has me stumped Message-ID: <871yjunfn5.fsf@pooh.int>
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It's late in the day, my coffee's wearing off, and my brain is fried.
My new ISP uses private addresses for all internal routing. Let's say that
my new public address block is 1.2.3.0/24, and that the routing block
between their network and mine is 10.0.0.0/30, and my default router is
10.0.0.1.My FreeBSD 4.4 (STABLE) machine, named gw1 and housing several
Ethernet cards, will be a router and DNS server. Here is the basic network
diagram:
Internet +---
|| | Their network
10.0.0.1 - their router +---
||
||
10.0.0.2 - gw1 +---
|| |
1.2.3.0/24 - gw1 | My network
|| |
Public servers |
on my LAN +---
Because gw1 needs to be world-accessible, I need both the private
(10.0.0.2/30) and public (1.2.3.0/24) configured on the same NIC. While
that's trivial enough, my problem is that all outgoing packets originating
from gw1 have a source address in the private block, which means that I
can't ping out or traceroute past the borders of my ISP's internal routing
system.
My guess is that the outbound packets get a source address in the private
block because the default route is in that block. Is there a way to get
FreeBSD to use a particular address out of several on an interface as the
source address?
Please forgive me if I sound like a crack junkie. I've been looking at the
screen too long for one day's work.
--
Kirk Strauser
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