How to get my Dad's Win2k system to access internet through my FreeBSD 6.2 system

[Da Rock]

On Wed, 2008-10-15 at 04:10 -0700, Jeremy Chadwick wrote:
> On Wed, Oct 15, 2008 at 08:40:48PM +1000, Da Rock wrote:
> > 
> > On Tue, 2008-10-14 at 06:46 -0400, Michael Powell wrote:
> > > Jeremy Chadwick wrote:
> > > 
> > > > On Tue, Oct 14, 2008 at 04:55:11AM -0400, Michael Powell wrote:
> > > [snip] 
> > > >> Next, you will want to configure your FreeBSD machine as a NAT gateway.
> > > >> In your /etc/rc.conf you will want something like gateway_enable="YES"
> > > >> and some form of firewall initialization[1]. The gateway_enable is what
> > > >> allows the forwarding of packets between your rl0 and your rl1, but the
> > > >> activation of NAT functionality is usually a function contained within a
> > > >> firewall. So conceptually, the firewall will be "in between" rl0 and rl1.
> > > >> 
> > > >> There are three different firewalls you can choose from. Configuring the
> > > >> firewall is usually where the inexperienced get stuck. This subject
> > > >> material is beyond the scope of this missive, and you would do well to
> > > >> start reading in the Handbook. But essentially, when you configure NAT in
> > > >> the firewall your rl0 (connected to the ISP) will be assigned a "Public"
> > > >> IP address and the NAT function will translate between "Public" and
> > > >> "Private".
> > > 
> > > With respect to "NAT", the caveat here is the assumption that your DSL/Cable
> > > modem is *not* already performing NAT. The situation you do not want to get
> > > into is having *two* NATs. The content herein is assuming that the external
> > > (rl0) interface is getting assigned a "Public" IP from the ISP. 
> > >  
> > 
> > If this is the case wouldn't the OP set router_enable=YES instead of
> > gateway?
> 
> No.  router_enable causes routed(8) to run, which allows for
> announcements and withdraws of network routes via RIPv1/v2.  This is
> something completely different than forwarding packets.
> 
> What the OP wants is to route packets from his private LAN (e.g.
> 192.168.0.0/16) on to the Internet using NAT.  That means he has to have
> a NAT gateway of some kind that forwards and translates packets.  That
> means he needs gateway_enable="yes", which allows IPv4 forwarding
> to happen "through" the FreeBSD box.  In layman's terms, it allows
> the FreeBSD box to be used a "Gateway" for other computers which
> are connected to it directly.
> 

Ok, then. So it would be gateway_enable, but no nat_enable? (To avoid
double nat'ing)