I need help to set up internet sharing in linux. Post: 23049

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Top Forums UNIX for Dummies Questions & Answers I need help to set up internet sharing in linux. Post 23049 by Nazo on Saturday 15th of June 2002 11:38:39 PM

06-16-2002

Registered User

Quote:

Originally posted by PxT
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).

Thanks. I'll look into that as soon as I get the chance. As for security issues, well, I'm not really too concerned. The pc isn't exactly vital for anything and, besides, it's behind that first PC anyway, but even if someone did attack it it wouldn't do much damage. Even if I have to reinstall, once I get ICS working once, I should be able to remember well enough how to do it again.

Last edited by Nazo; 06-16-2002 at 12:59 AM..

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LEARN ABOUT MINIX

uuid_compare

UUID_COMPARE(3) 						    Libuuid API 						   UUID_COMPARE(3)

NAME

       uuid_compare - compare whether two UUIDs are the same

SYNOPSIS

       #include <uuid.h>

       int uuid_compare(uuid_t uu1, uuid_t uu2)

DESCRIPTION

       The uuid_compare function compares the two supplied uuid variables uu1 and uu2 to each other.

RETURN VALUE

       Returns	an  integer less than, equal to, or greater than zero if uu1 is found,	respectively, to be lexicographically less than, equal, or
       greater than uu2.

AUTHOR

       Theodore Y. Ts'o

AVAILABILITY

       libuuid is part of the util-linux package since version 2.15.1 and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

SEE ALSO

       uuid(3), uuid_clear(3), uuid_copy(3), uuid_generate(3), uuid_is_null(3), uuid_parse(3), uuid_unparse(3)

util-linux							     May 2009							   UUID_COMPARE(3)

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