Guys,
I've got Comcast@Home cable modem working fine using a Linux box (RH 6.1
on a 486/100) as a firewall and I have a Win98 and a Linux/Win98 box
behind the firewall (with a hub). We're officially using DHCP, but I was
told that the IP addresses will never change, so, I'm using a static IP
address. Also, I've been using PM Firewall (http://www.pointman.org).
Works perfect.
Here's the problem. A friend just subscribed for Comcast@Home and
wanted to duplicate the setup I have at my house. I put together a
Pentium 90, installed the Red Hat 6.1, set it up for masquerading,
installed the firewall software, etc. Tested it at my house, worked
great. I took it over to his house and did the following:
1. Assigned a 192.x.x.x IP address to the Win 2000 box, changed default
gateway (to the Linux box), and plugged it into the hub.
2. Changed the IP, DNS, hostname and other settings on the firewall so
that they matched the Win 2000 box.
3. Plugged the firewall into the hub and the cable into the firewall.
4. Rebooted everything.
The firewall can't ping anyone on the @Home system - not even the
gateway. The firewall can ping the Win 2000 box on the 192.x.x.x net.
Did you ever have a box on the LAN with the wrong network address - this
is how it behaved. tcpdump wouldn't even show any traffic, ifconfigs
looked correct, the routing table was correct. His IP address is static.
When we double checked the network settings on the firewall and his
network info provided by Comcast (IP, DNS, gateway, etc.) it all
matched. When we unplugged the Win 2000 box from the hub and put him
back to his original setup (Win 2000 box and cable modem only, original
network settings), he was back to where he was before we started.
So, I brought the firewall back to my house, changed the network
settings to my IP, DNS, and gateways, and of course it worked fine.
What could be different between his Comcast@Home subnet and mine?
I've had a firewall box with my cable modem for over a year and a half
and have used Linux every day at work for ~5 years. So, I'm pretty
familiar with Linux, networking, etc. I'd like to think that I know
what I'm doing.
This one has me stumped. I noticed a few threads a few weeks ago on a
newsgroup and someone seemed to have a similar problem with @Home.
Any suggestions?
Thanks for the help.
Mark
--
Mark Riehl
The MITRE Corporation
[EMAIL PROTECTED]
(732) 389-6752
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