You must have 2 nics in your brothers maschine.
eth0 connected to ADSL modem and
eth1 connected to the lan.
I never make it or got an decent answer here on he
list using ipchains as firewall,One person said I
should use bridge, and another said not. Very
confusing.The third person said I should use nat
,masquerade and iptables, so finally i get it up and
running after much work.
1.st Check if your kernel is enabled for nat and
iptables.These modules should be loaded to perform
iptables firewall.

iptable_nat            15092   1 (autoclean)
[ipt_MASQUERADE]
ip_conntrack           15788   2 (autoclean)
[ipt_MASQUERADE ipt_state iptable_nat]
iptable_filter          1696   1 (autoclean)
ip_tables              12384   8 [ipt_MASQUERADE
ipt_LOG ipt_limit ipt_state iptable_nat
iptable_filter]
Try modprobe ip_tables and see if you can install
it.If you can not you have to enable it in your kernel
and compile it. And that is a chapter of itself.So if
not you cannot install the required modules, you can
keep asking this list for an proper answer using
forwarding and ipchains. Bridge doesent help much.
But I srongly recommend iptables as firewall because
its easier to apply rules exactly for you need, and
google is full of examples.


 --- Brenden Walker <[EMAIL PROTECTED]> skrev: >
> -----Original Message-----
> > From: Steve Coffman [mailto:[EMAIL PROTECTED]]
> 
> > Sent: Monday, September 23, 2002 3:19 PM
> > To: [EMAIL PROTECTED]
> > Subject: Dynamic IP Address from Cable - Help?
> > 
> > 
> > Hi,
> > I'm trying to set up a simple firewall (ipchains)
> and router 
> > for my brother-in-law that just got cable access.
> I have a 
> > similar router at home using a DSL static IP
> address. 
> > Question: What steps do I need to take to get the
> current IP 
> > address from the cable modem (DHCP?).
> 
> AFAIK, the cable modem doesn't have any address
> (other than a hardware
> serial number).  The cable modem just converts the
> cable signals into
> Ethernet, the address that 'the world' sees is the
> address of your interface
> that is connected to the cable modem.
> 
> >                  What do I need to change in the
> ipchains if anything.
> 
> See previous threads here on MASQ tutorial.
> 
> >                   I'm also having a problem
> getting the dns servers.
> 
> You'll want to find a free DNS service such as:
> 
> www.dyndns.org
> www.easydns.org
> www.ods.org
> www.zonedit.com
> 
> 
> > 
> > Any help, examples, or where to look would be
> great.
> > 
> > Thanks
> > Steve Coffman
> > 
> > 
> >
>
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> > 
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