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Old 05-26-2004, 05:14 PM   #1
grcunningham
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Registered: Apr 2004
Location: Florida
Distribution: RedHat 9.0/Afterstep
Posts: 103

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noob cant figure out NAT


oowww!!! been banging my head on the wall

I have a very simple setup:
Fast computer:
eth0:192.168.0.1
eth1: x.x.x.x DSL

Slooow computer
eth0: 192.168.0.2

the DSL works great on the fast computer, and the
two computers communicate fine(I can ping, use NFS,ssh, etc)

Ive been on Netfilter.org all day reading about iptables, reading
HOWTO's, etc, and trying all the sample scripts...
unfortunately, all these samples are pages and pages long, with
lots of stuff i have no clue about (mangling, etc)

ive seen on forum posts where people say that it only took them 4
lines and it was working fine, i dont get it
I realize that i will have to do firewalling also, but first i would at
least like to be able to ping yahoo.

can anyone point me in the right direction, or let me know where
there is a HOWTO thats less than 50 pages? the Iptables Tutorial 1.1.19
im reading now is 150 pages!!!
thanks
 
Old 05-26-2004, 05:33 PM   #2
grcunningham
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Registered: Apr 2004
Location: Florida
Distribution: RedHat 9.0/Afterstep
Posts: 103

Original Poster
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found something...i used this

modprobe iptable_nat
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward

works great....
 
Old 05-27-2004, 02:36 AM   #3
maxut
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Registered: May 2003
Location: istanbul
Distribution: debian - redhat - others
Posts: 1,188

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what about security?
u better visit www.iptables-script.dk
good luck
 
Old 05-28-2004, 05:12 AM   #4
presemt_arms
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Registered: Sep 2003
Distribution: pclinuxos pre8, dynabolic, knoppix 3.6, k12 ltsp, ubuntu
Posts: 54

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i have a similiar line also which works great in 2.4.x kernel... however if i boot to 2.6.x i get an invalid argument... the line being

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to <ipaddress> where ip is the eth0 ip


i think i missed something

i usually do untill the 500th attempt... all more fun
 
Old 11-03-2004, 11:48 AM   #5
cyto
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Registered: Aug 2004
Location: London
Distribution: FreeBSD 6.0, Freebsd 5.3, Freebsd 4.10, SuSE 9.2 pro, Slackware 10.1, FreeBSD 5.4 RC3
Posts: 270

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Nice title. lol
 
  


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