If you are planning on doing Network Address
Translation (NAT) or IP Masquerade (the Linux term for it), then under FreeBSD 3.*,
you can easily use ipnat. This is a great little tool provided by Darren
Reed as part of his amazing packet filter ipfilter (the home page is http://coombs.anu.edu.au/~avalon/).
The following message indicates that your your kernel is not configured for ipfilter
and you will need to perform the steps outlined in the following sections of this article:
# ipnat -f /etc/ipnat.conf
/dev/ipnat: open: Device not configured
What is ipnat used for?
In simple, terms, NAT is the translation of internal addresses to external addresses.
This is commonly done on a gateway machine such as a dial-up box at home where you
have more than one computer. This allows all of your boxes to share a single
connection to your ISP. You may be familiar with WinGate
which does a similar function.
One of the best how-to guides for ipfilter (ipnat)
is at:
The following instructions apply only if you are only ipnat and *not* adding IP
Filter. The IP Filter installation process will do the following steps
for you.
