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Old 04-08-2004, 12:28 PM   #1
thirumala
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Registered: Mar 2004
Location: USA
Posts: 18

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Question routing setup


Hi,

I want to setup a router on linux PC for testing with NISTNet with the following config:


GW-------SW[lan]-------------[eth0 linux box with redhat 9.0 eth1]--------client pc

Eth0: 192.168.10.40 with 192.165.10.0 network
Router/GW: 192.168.10.1

Eth1: 192.168.20.1 with 192.168.20.0 network

Client PC: 192.168.20.25 with gateway set to 192.168.20.1



I have enabled IP-forwarding using
echo "1" > /proc/sys/net/ipv4/ip_forward

And

FORWARD_IPV4=yes in sysctl.conf file.


At present I am able to ping from linux box towards both sides but not from client pc to GW or clients on lan to client pc.

I want to route any type of traffic between eth0 and eth1 without any filters {for NIST Net testing]. What do I need to do?

What is the basic iptables script to achieve this?

anybody, please help me out with this problem.

Thanks,
Thiru
 
Old 04-08-2004, 02:51 PM   #2
paijm021
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Registered: Apr 2004
Location: Germany
Distribution: Slackware 9.1
Posts: 20

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routing with linux is a dream comming true. (compared with M$) :^)
 
Old 04-08-2004, 03:01 PM   #3
zymurgist
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Registered: Jan 2003
Location: Long Island
Distribution: Redhat 8.0
Posts: 109

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Did you compile routing into the kernel? Not always there by default.
 
Old 04-09-2004, 09:17 AM   #4
thirumala
LQ Newbie
 
Registered: Mar 2004
Location: USA
Posts: 18

Original Poster
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Re: routing setup

Quote:
Originally posted by thirumala
Hi,

I want to setup a router on linux PC for testing with NISTNet with the following config:


GW-------SW[lan]-------------[eth0 linux box with redhat 9.0 eth1]--------client pc

Eth0: 192.168.10.40 with 192.165.10.0 network
Router/GW: 192.168.10.1

Eth1: 192.168.20.1 with 192.168.20.0 network

Client PC: 192.168.20.25 with gateway set to 192.168.20.1



I have enabled IP-forwarding using
echo "1" > /proc/sys/net/ipv4/ip_forward

And

FORWARD_IPV4=yes in sysctl.conf file.


At present I am able to ping from linux box towards both sides but not from client pc to GW or clients on lan to client pc.

I want to route any type of traffic between eth0 and eth1 without any filters {for NIST Net testing]. What do I need to do?

What is the basic iptables script to achieve this?

anybody, please help me out with this problem.

Thanks,
Thiru


Hi,
any help from anybody!


thanks,
Thiru
 
Old 04-09-2004, 09:32 AM   #5
maxut
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Registered: May 2003
Location: istanbul
Distribution: debian - redhat - others
Posts: 1,188

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stop iptables.

or delete rules:
iptables -F

so it will become a router without filter. what's your distro?

Last edited by maxut; 04-09-2004 at 09:47 AM.
 
Old 04-09-2004, 12:49 PM   #6
thirumala
LQ Newbie
 
Registered: Mar 2004
Location: USA
Posts: 18

Original Poster
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Quote:
Originally posted by maxut
stop iptables.

or delete rules:
iptables -F

so it will become a router without filter. what's your distro?
thanks for the reply, please have a look at below explanation:

Setup:


LAN-------SW-------------[eth0 linux box with redhat 9.0 eth1]--------client pc

Eth0: 192.168.10.40 with 192.165.10.0 network
Router/GW: 192.168.10.1

Eth1: 192.168.20.1 with 192.168.20.0 network

Client PC: 192.168.20.25 with gateway:192.168.20.1


I want to route any type of traffic between eth0 and eth1.

Here is route command output:

192.168.20.0 * 255.255.255.0 U 0 0 0 eth1
192.168.10.0 * 255.255.255.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth1
127.0.0.0 * 255.0.0.0 U 0 0 0 l0

and

I have enabled IP-forwarding using
< echo "1" > /proc/sys/net/ipv4/ip_forward >

And FORWARD_IPV4=yes in sysctl.conf file.


With the above basic setup, I am able to ping

client PC to eth1, eth0
LAN PC to eth0 only

With the following implementation:

iptables t nat -A POSTROUTING o eth0 j MASQUERADE

I am able to ping:

client PC to eth1, eth0 and LAN PCs
LAN PC to eth0 only

I am not able to ping either eth1 or client PC from LAN PCs. Why?

-Thanks,
Thiru
 
  


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