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Linux as a router

Discuss Linux as a router in the Linux Help forum on Dev Shed.
Linux as a router Linux Help forum discussing topics including usage, troubleshooting, modules, and distributions. Linux is an open source OS, based on UNIX.

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  #1  
Old November 5th, 2001, 05:30 PM
Theeggman Theeggman is offline
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Linux as a router
I am trying to use my linux box as a router so that I can surf using my OSX box. I have tried a few things and failed. I am looking for a good tutorial or explanation of how to do this using Redhat 7.1. I accessing the internet through a dial up modem.

E.
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Old November 6th, 2001, 06:10 AM
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I am using IP-tables....

Haven't got any URL to provide you with but
search for
ip tables tutorial linux

..in a searchengine
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Old November 6th, 2001, 09:20 AM
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Alternatively try ipchains. Search for ipchains HOWTO.
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Old November 6th, 2001, 09:32 AM
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What ip mask are you using for your Network Card... if your using 198.168.0.X as your IP address (where X = your machine number.. ie: 192.168.0.1) on the network card the following should work (you will need root access of course):

Open up and edit the file "/etc/rc.d/rc.local" file and add the following:

Code:

echo "1" > /proc/sys/net/ipv4/ip_forwarding
ipchains -P forward DENY
ipchains -A forward -j MASQ -s 192.168.0.0/24 -d 0.0.0.0/0


Next open up and edit the file "/etc/sysconfig/network" and add or edit the following line:

Code:

FORWARD_IPV4 = yes


Then reboot...

Please note this was based on RedHat 6 and it worked, so it may or may not work on other systems... all ya can do is try it and see...

Another good idea is to install and use Squid Proxy Caching Server...

Hope this helps

God Bless
Scott
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Last edited by deepspring : November 6th, 2001 at 09:35 AM.
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Old November 6th, 2001, 09:38 AM
realnowhereman realnowhereman is offline
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Btw, you can do many "nice" things with ipchains:
  • deny access to ad servers - ad free surfing
  • lock out hackers ;-)
  • masqerade your network (as demonstrated by deepspring)
and many more ...
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Old November 6th, 2001, 09:55 AM
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You can even accidently redirect all packets to yourself and lock your machine up... (don't recommend this)...

Lockout out all of your LAN and block access to certain ports...

You can even have IP chain wars in the computer labs at uni or college...
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Old November 25th, 2001, 11:52 PM
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Exclamation Firewall
If you're using your Linux router to route to a broadband connection such as cable or dsl, you'll need a firewall.

One of the easier ones I've found to configure would be gShield, but there are dozens of good ones floating around Freshmeat.

Ref.
http://freshmeat.net
http://muse.linuxmafia.org/gshield.html
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Old November 26th, 2001, 12:07 AM
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>> johan: I am using IP-tables....

Good choice.

>> Alternatively try ipchains

Bad choice.

ipchains, being a stateless packet filter, is not secure in design. So do what johan told you to do. You might not concern about security. My whole point is, if you are new to both, pick the best alternative - iptables, and stop wasting your time on learning ipchains.
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