[lug] cable modem network topology

[Jeff]

I have a very similar situation at home.  I have anywhere from 2-4
machines on my home lan using only 1 outside ip.  Use ip masq'ing.  Much
easier and cheaper.

Jeff

LittleViggy at alum.manhattan.edu wrote:
> 
> Why the need for Internet addys for each machine behind the firewall?  Couldn't
> you setup IP masq'ing, and just use one Internet IP?
> 
> My setup (albeit DSL) is like this, on Windows (yuck!).  I have one machine
> that has the DSL card and an Ethernet card.  It's running NAT32p (a Windows
> program for doing IP masqing).  From the two machines behind the router
> machine, I can do anything I want (including VPN).  The only thing I cannot do
> is have people contact machines behind my router, which is not a problem for me.
> 
> If you could get away with that, it's prolly less of a headache to setup.  And,
> it saves you $10 /mo...  Best of all, the ISP really need not know that you've
> done this!
> 
> :-)
> 
> Viggy
> 
> D. Stimits wrote:
> > Within the last two weeks, my telephone line quality went permanently
> > downhill. Not only is it between 25% and 33% slower, latency seems to
> > have doubled. The phone company is not interested until it drops below
> > 14.4kbps. Within roughly the last week, cable modems became available
> > for a good price (especially compared to DSL).
> >
> > What I want to do is use an old P166 as the firewall/router/gateway, but
> > it is complicated by the need for 3 IP addresses, all of which are
> > dhcp/non-static. Each dynamic address beyond the first costs $5 each,
> > but that is fine for 3 computers that might run at the same time. The
> > gateway/router/firewall does not need a routable IP as far as I am
> > concerned. What I wanted was something like this:
> >
> > cable modem
> >     | (eth0)
> >   P166 firewall/gate/router
> >     | (eth1)
> >   8 port switch
> >     |
> >     |- Machine 1
> >     |- Machine 2
> >     |- Machine 3
> >
> > But how to actually do this is a mystery, it seems as though the P166
> > would need eth0 to respond to multiple dhcp IP's, and then transparently
> > forward them to whichever machine booted up, while still allowing rules
> > to stop things like port 137-139 from passing through. I have never set
> > up a DHCP system, which seems easy if only one machine touches the cable
> > modem, but becomes problematic if the P166 must simply pass through DHCP
> >  packets, then do the right firewalling for each machine. Can this be done?
> >
> > D. Stimits, stimits @
> idcomm.com
> 
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Mike regarding Goose