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questions about a typical linux firewall-type system

B

Barnaby W. Füi

Elite Member
ok i got this p233 with 2 isa nics in it, a 1.2 GB hard drive, and although i'm sure i could figure out the network card chipset and set up debian on it and be all hard core about it, i decided to be a lazy bastard and just toss red hat on it, especially considering the auto-hardware detection (something debian needs IMO). so it detects them as NE2000 compatible nics, and sets them up as eth0 and eth1 (duh)

i set eth0 to be the WAN nic. i give it my IP i use from my ISP, and all of the other settings i use from my ISP normally. and eth1 i give the ip of 192.168.0.1, and the netmask, default gateway and dns server i leave at defaults (not sure if i should change those or not)

well, either way, i tried getting an internet connection, i tried both nics (considering i didnt know which one was which at this point, they are identical), but lynx couldnt get a connection and irc couldnt either. they couldnt even resolve the hostname so i know its not even getting to the name server.

anyays, redhat seemed to detect them with no probs, it didnt report any problems at all, yet i get no connection. i won't be able to work on said computer much until i get a new PSU, but what are some ideas i can try when i do get the PSU?

oh yeah some other stuff i just remembered:

in the installation, i chose the firewall rule of "high security", and didnt customize it at all, would that block ALL access, including http?

if its just a matter of editing hosts.allow and hosts.deny then i can handle that <http://forums.anandtech.com/i/expressions/face-icon-small-smile.gif>

thanks
 
ne2k compatible nics are usually anything but. Maybe try another nic and see if that works. Also, check the irqs and the settings ont he nics. ISA was always a pain.
 
I will be assuming you have a static IP from your provider . . .

First check whether the NIC's are up with ifconfig. Or, checkout what dmesg says.
If they are not up, then there is something wrong with the modules and you should try to research about possible known problems with your NIC's. I would recommend google.
If they are up, add your ISP DNS servers infomation to your resolv.conf file under /etc.
Hook up your network, and then check if you can ping to the outside. Or, you can check your routing with the route command to see wheather you can see you provider's gateway IP (NOTE: eth0 is the frist NIC found during slot scan, and so on).

WRT your firewall settings, I am not familiar how RedHat sets up a firewall, or how they manage it. So I would not be able to help you there . . . BUT, you can do a dump of the firewall configuration and hopefully you will be able to see what kind of security it has given you. Try: iptables -L | more, and check out what its output tells you.

Hopefully this info will help you. . .

GL

P.S. Perhaps you may need to enable isapnp to be able to configure you cards correctly. You may want to do a man on it.
.........And make sure you are root, or su to root when using the above commands.


/edit: Added P.S.
 
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