LINUX as a router

[Norman_21]

Hi guys,

I have a laptop without a floppy drive, I'm trying to configure my linux as a router with cable modem internet connection but most of the documents that I went through, states that I have to creat a floppy drive. anyone can advise please for step by step configuration without having to boot from a floppy drive.
appreciate your support.

[Craig Rants · Accepted solution]

Are you trying to run Linux on your laptop? Do you have two NIC's on the Linux machine? I think that you should look at the ipchains documentation for NAT'ing devices.

GL,
C

[Norman_21]

Hi Craig,

Yes, that's exactly the case. I do have two NICs in my loptop. Could you provide me with some good links for configuring the IPCHAINS as NAT.

[Yogeeraj_1]

hi,

try this link:
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x14d20bce6f33d6118fff0090279cd0f9,00.html

or do a search here itself on IPCHAINS. You have tons of information.

Also, an example Linux ipchains NAT:
==============================
Linux 2.2 redirecting eth0 TCP port 80 to Squid on port 3128
Kernel options:
CONFIG_IP_FIREWALL=y

CONFIG_IP_ALWAYS_DEFRAG=y
ipchains ruleset
# Accept local traffic

ipchains -A input -j ACCEPT -i eth0 -d 10.11.12.13/32
# Redirect port 80 to Squid on port 3128
ipchains -A input -j REDIRECT 3128 -i eth0 -p tcp -d 0.0.0.0/0 80

==============================

Hope this helps!
Best Regards
Yogeeraj

[Admin32_1]

Have you thought about upgrading to IPTables ?
I use to use IPChains and the rules get VERY messy if you want to use the advanced filtering features.

IPTables is a HUGE improvement in packet handling and also will allow you to do simple NAT (NAT Overload Mode) in one single command, something impossible with IPchains.

It takes abit of time to get use to them but I assue you, you will not regret it once you get the hang of them.

If you have used IPchains and understand them, then IPTables will be easy for you.

Cheers,

Chris P.
www.firewall.cx

[Norman_21]

Closed...