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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).
 
Test Your Knowledge in Computers #757
Difficulty: Medium
The MOSFET is the least common semiconductor device in digital and analog circuits.
True or False?

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CTRLALTDEL(8)						     Linux Programmer's Manual						     CTRLALTDEL(8)

NAME
ctrlaltdel - set the function of the Ctrl-Alt-Del combination SYNOPSIS
ctrlaltdel hard|soft DESCRIPTION
Based on examination of the linux/kernel/sys.c code, it is clear that there are two supported functions that the Ctrl-Alt-Del sequence can perform: a hard reset, which immediately reboots the computer without calling sync(2) and without any other preparation; and a soft reset, which sends the SIGINT (interrupt) signal to the init process (this is always the process with PID 1). If this option is used, the init(8) program must support this feature. Since there are now several init(8) programs in the Linux community, please consult the documentation for the version that you are currently using. ctrlaltdel is usually used in the /etc/rc.local file. FILES
/etc/rc.local SEE ALSO
simpleinit(8), init(8) AUTHOR
Peter Orbaek (poe@daimi.aau.dk) AVAILABILITY
The ctrlaltdel command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. Linux 1.2 25 October 1993 CTRLALTDEL(8)

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