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Old 06-20-2002, 09:55 PM   #1
gogo
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Question RH Linux 7.3 (Gateway) and W2K server as client


Dear all,

I set up red hat 7.3 with 2 network cards: eth0 and eth1.

eth0 is connected to the ISP and I set the DNS as look at the DNS of your service provider with DHCP.

eth1's ip is 192.168.0.1 Subnet mask 255.255.255.0

Surely, routed service is started.

ipchains -A forward -s 192.168.0.0/24 -j MASQ

/etc/rc.d/init.d/network restart

echo 1 > /proc/sys/net/ipv4/ip_forward

In Window 2000 server, ip is 192.168.0.2 subnet mask 255.255.255.0 Gateway 192.168.0.1

From window machine, ping 192.168.0.1 - ok
From red hat box, ping 192.168.0.2 - ok

But, window machine cannot connect to the Internet.

What's wrong with my setting and how should I fix it?

Thanks in advance

gogo
 
Old 06-20-2002, 10:36 PM   #2
gogo
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I found out that I need to use iptables instead of ipchains to configure the ip MASQ. However,

When I input iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

It showed an error: init_module: Device or resource busy

insmod iptables failed

iptables v1.2.5: can't initialize iptables table 'nat': iptables who?

When I typed modprobe iptable_nat, it showed "Can't locate such module"

When I typed /lib/modules/2.4.8-10/kernel/net/ipv4/netfilter/modprobe ip_tables

It showed init_module: Device or resource busy.

So, how can I fix it?

And do I need to remove the ipchains command preivously inserted? If so, how can I remove the old command?

Thanks for help.

gogo
 
Old 06-21-2002, 02:32 AM   #3
bkeating
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I was just about to ask the same question but a few directories up.

I currently use mandy which has it's 'internet connection sharing' gui -based wizard, was wondering if redhat is more manual, interacting with iptables directly, like you explained up above. I would LOVE that. mandy gets the job done but I'd like to have more controll by setting it up from ground zero manually.

I will start looking into how to go about doing this and provide this thread with as many results as i can find before I got to bed.
 
Old 06-21-2002, 03:56 AM   #4
Griffon26
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The IP masquerading HOWTO describes how to use iptables to set up your firewall. It also explains what you need to enable in your kernel if it isn't enabled already.

Example iptables firewall script: here

P.S.: If IE says it can't load the page, remove the slash it appended at the end of the url and press enter.

Last edited by Griffon26; 06-21-2002 at 03:58 AM.
 
Old 06-21-2002, 05:31 AM   #5
gogo
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Previously, I set the ipchains rule. According to the HOWTO doc, No iptables modules can be loaded when in that mode.

So, could anyone tell me how to remove the ipchains mode previously configured?

Thanks

gogo
 
Old 06-21-2002, 11:23 AM   #6
gogo
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I fixed the iptable problem and thanks for all of kind help

gogo
 
Old 06-24-2002, 04:08 AM   #7
guanyu
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Distribution: RedHat 7.0,7.1,7.2,7.3,8.0. Sun Solaris
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gogo,
I got one question for you. Did you install netfilter? As I know RH 7.2, we need to install it in order to get the NAT function.
 
Old 06-24-2002, 10:51 AM   #8
gogo
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Hi,

I am a linux newbie and I have not heard netfilter. I did not install or configure it on 7.3 version.

gogo
 
  


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