Cable Modem and DSL - help!

[Tony Hammitt]

I'm not sure you need a second card.  Linux is good at IP aliasing,
it comes compiled with the stock distro kernels and is pretty easy
to set up.

Just run 'ifconfig eth0:1 <internal IP address>' and you can use
your local /etc/hosts file for internal name resolution.  You'll
still broadcast local traffic to the cable modem, but it should
ignore it.  Just to be on the safe side, I use 10.1.1.* as my
local IP addresses since the backbone routers ignore such addresses.

I can't really tell since my cable modem is hooked to a switch.

Regards,

Tony

FYI, According to RFC 1597 (http://www.isi.edu/in-notes/rfc1597.txt):

The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private networks:

10.0.0.0        -   10.255.255.255
172.16.0.0      -   172.31.255.255
192.168.0.0     -   192.168.255.255

Chris Midkiff wrote:
> 
> You're right, you need a second nic to connect to an internal network.
> Roadrunner cable modems (at least the ones I have used) act as bridges.
> They will only pass valid public tcp/ip information.
> 
> The person who asked the original question did not say whether he has
> more than one machine (and I didn't want to scare him).  If there is a
> local network, masquerading to a separate nic is the way to go.  You
> _can_ simply plug the cable modem into the uplink port on your hub, but
> then you have the problems (mentioned below) with broadcasting local
> traffic as well as local name resolution problems.  Since roadrunner
> uses dynamic addressing, you can't even use a host file for internal
> name resolution.  (Also makes it a pain to host a page, which was
> probably their intent.)
> 
> Chris Midkiff
> > -----Original Message-----
> > From: Pat Miller [SMTP:pert at tas-kc.com]
> > Sent: Monday, January 31, 2000 2:11 PM
> > To:   kclug at kclug.org
> > Subject:      Re: kclug - Cable Modem and DSL - help!
> >
> > One thing to be aware of is weather the modem is a route or bridge.
> >
> > Router--Just plug in your network (masquerade to get internet
> > services)
> > Bridge--You will need a second NIC (or switch/router) to keep your lan
> > traffic off the internet segment (think of a 10 meg segment bridging
> > over a 128K uplink on DSL) or 10 neighbors bridging a total of 100
> > megs
> > onto the cable segment
> >
> > New cable modems block all non-public traffic (after early providers
> > networks died)
> >
> > To make the DSL profitable the DSL modems are just bridges
> >
> > Chris Midkiff wrote:
> > >
> > > I'd be happy to help with the cable modem, I have roadrunner running
> > > through linux as a masquerade server for the network.  Really, all
> > you
> > > need is a functional ethernet card set to retrieve info via pump or
> > > dhcpcd.  Please send more info, (Distro you are using, Nic, network
> > > setup, etc)  The roadrunner login program is not nessisary to browse
> > or
> > > retrieve email. It's only used to administrate the account (change
> > > password, etc).
> > >
> > > Chris Midkiff
> > >
> > > > -----Original Message-----
> > > > From: Randy Rathbun [SMTP:randy at middlewest.com]
> > > > Sent: Monday, January 31, 2000 9:19 AM
> > > > To:   kclug at kclug.org
> > > > Subject:      kclug - Cable Modem and DSL - help!
> > > >
> > > > A while back someone mentioned they had hooked up a cable modem to
> > a
> > > > linux box.
> > > > A friend of mine is having trouble getting his box to play with
> > his,
> > > > so I
> > > > figured I would ask here if someone has a link to any info I might
> > be
> > > > able to
> > > > pass on to him.
> > > >
> > > > Also, if anyone has any info on hooking up to DSL, please pass
> > that
> > > > along also.
> > > > I am getting DSL installed 2/16 at my house and want things to be
> > > > smooth.
> > > >
> > > > Thanks in advance!
> > > >
> > > > Randy
> > > >
> > > >
> > > >
> > > >
> > >
> > File: Card for Pat Miller >>
>