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Top Forums UNIX for Dummies Questions & Answers I need help to set up internet sharing in linux. Post 23019 by PxT on Friday 14th of June 2002 03:38:14 PM
Old 06-14-2002
In anutshell you want to do:

# In the NAT table (-t nat), Append a rule (-A) after routing
# (POSTROUTING) for all packets going out eth0 (-o eth0) which says to
# MASQUERADE the connection (-j MASQUERADE).
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

# Turn on IP forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward


Lets call the box running iptables "router". You would set the default gateway on your other machines to point at router. Their DNS could point to an external box, or your internal machine.
(Above examples assumes eth0 is your internet interface).
See http://netfilter.samba.org for lots of docs on how to use iptables.

Setup BIND (ugh...lots of security problems) or djbdns (http://cr.yp.to) on your internal box to do DNS (most likely a caching server which points at the external world).
 

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LINUX-VERSION(1)					      General Commands Manual						  LINUX-VERSION(1)

NAME
linux-version - operate on Linux kernel version strings SYNOPSIS
linux-version compare VERSION1 OP VERSION2 linux-version sort [--reverse] [VERSION1 VERSION2 ...] linux-version list [--paths] DESCRIPTION
linux-version operates on Linux kernel version strings as reported by uname -r and used in file and directory names. These version strings do not follow the same rules as Debian package version strings and should not be compared as such or as arbitrary strings. compare VERSION1 OP VERSION2 Compare version strings, where OP is a binary operator. linux-version returns success (zero result) if the specified condition is satisfied, and failure (nonzero result) otherwise. The valid operators are: lt le eq ne ge gt sort [--reverse] [VERSION1 VERSION2 ...] Sort the given version strings and print them in order from lowest to highest. If the --reverse option is used, print them in order from highest to lowest. If no version strings are given as arguments, the version strings will instead be read from standard input, one per line. They may be suffixed by arbitrary text after a space, which will be included in the output. This means that, for example: linux-version list --paths | linux-version sort --reverse will list the installed versions and corresponding paths in order from highest to lowest version. list [--paths] List kernel versions installed in the customary location. If the --paths option, show the corresponding path for each version. AUTHOR
linux-version and this manual page were written by Ben Hutchings as part of the Debian linux-base package. 30 March 2011 LINUX-VERSION(1)
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