Comcast Cable Modem install?
Matt Luettgen
matt at tccassociates.net
Tue Dec 17 23:33:20 CST 2002
I've shared comcast HSI personally and for some clients of mine...I
suggest installing 2 nic's in one box, and having that box serve the
internet to the rest. I use ipkungfu to do this (an iptables script)
http://www.linuxkungfu.org/ipkungfu-0.2.1.tgz
Or you can use a broadband router
On Tue, 17 Dec 2002 17:11:08 -0600 (CST)
Dustin Decker <dustind at moon-lite.com> wrote:
> On Tue, 17 Dec 2002, Gene Dascher wrote:
>
> > What do you mean "only connect the cable modem to the firewall or
> > you will have to work around that"? What else would you connect the
> > firewall to? The only MAC address authentication that they do is on
> > the Cable modem itself, at least so far that I am aware. I am using
> > an old 486 as my firewall with an old ISA NIC. The PCI NIC that
> > they gave me is on another machine.
>
> This is an issue with both Comcast _and_ RoadRunner. Nearly all cable
> providers configure their head-end (for you dsl folks, think "dslam")
> to recognize a specific number of MAC addresses connected to the cable
>
> modem. If you cable directly from a pc to the cable modem, then they
> see one MAC. If you cable the modem to a hub or switch, and then plug
> in multiple computers, then they see multiple MAC addresses.
>
> This in and of itself is no biggy really - until you're ready to
> request an address from the DHCP server. They generally configure to
> allow only one MAC address at a time to grab an IP. Although you can
> turn off or disconnect the pc that last leased one, the MAC address is
> still cached on the cable modem. The easiest way to clear it is to
> powercycle the modem.
>
> I have found that RoadRunner is quite easy to deal with on this - I
> just gave 'em a call and asked that they open mine up to allow
> multiple MAC addresses... for my home PC, the wife, and that laptop I
> wander back and forth between work and home with. (Whatever story you
> need to tell them to get however many IPs up and running.)
>
> Hope this helps - Dustin
>
> --
> *-----------------------------------*
> | Dustin Decker |
> | dustind at moon-lite.com
> *-----------------------------------------*|
> http://www.dustindecker.com | Even in evil, we discern rays of light
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