Hi,

I am new to linux. I want to setup a router on linux PC with following config:


GW-------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


I want to route any type of traffic between eth0 and eth1. What do I need to do?

What is the basic config for router setup?

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

Here is “route” command output:

192.168.20.0 192.168.20.1 255.255.255.0 UG 0 0 0 eth1
192.168.20.0 * 255.255.255.0 U 0 0 0 eth1
192.168.10.0 192.168.10.40 255.255.255.0 UG 0 0 0 eth0
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 eht1
127.0.0.0 * 255.0.0.0 U 0 0 0 l0
default 192.168.10.1 0.0.0.0 UG 0 0 0 eth0

and

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

And FORWARD_IPV4=yes in sysctl.conf file.

Please let me know where the things going wrong?


Thanks,
Thiru

Question?
What is the gateway set to on the client machine?

Do you want to perform NAT translation to share an internet ip address. Otherwise, why have 2 gateways and why even have a switch for only one device?

Hi,

thanks for the reply.

for your question 1:

NIC has set as GW.


for question 2:

this setup is for bandwidth testing using NIST Net.
I don't want to do any NAT or filtering and I just want to route all the traffic from NIC1 to NIC2 and NIC2 to NIC1.

I have some more questions:

1> For normal routing do I need to use IPTABLES?

2> If not, how to setup just all traffic routing between NICs?

3> how to disable IPTABLES startup during boot?


Thanks,
Thiru

TRY THE FOLLOWING FOR IPTABLES
1. deleting a specific rule:
replace the -A in the rule with -D and repeat the rule.
deleting all rules:
iptables -F

2. saving iptables rules:
service iptables save

this will save the rules to /etc/sysconfig/iptables and the rules will be aplied
after every boot.

3. listing iptables rules:
listing the filter table:
iptables -L
listing the nat table:
iptables -t nat -L

4. http://www.linuxguruz.com/iptables/howto/


Regarding routing, if you can get ES 3.0 then routin is enabled by default !! you don't need any rule, fortunately, or should I say unfortunately.

thanks for the reply.

I would like to know answers to the following questions:

I have some more questions:

1> For normal routing do I need to use IPTABLES?

2> If not, how to setup just all traffic routing between NICs?

3> how to disable IPTABLES startup during boot?


thanks,
Thiru

Which version of Linux are you running ?

Frankly, I have not set routing before, but I will try to test it on my RedHat 7.3 test PC.

becasue the newer version ES 3.0 which is currently running on our servers is a bit confusing because routing is enabled while IP FORWARDING is disabled !!

I will let you know as soon as I get more details.

To remove the IPTABLE rule use -D switch as I mentioned in my previous messae then SERVICE IPTABLES SAVE

Download the parprotued package from "somewhere" (google it). Install. Change ips for both nics to the same, with broadcast to 255.255.255.255 and netmask to 255.255.255.255. Run

parprouted eth0 eth1

Disable ip-tabling

iptables --flush
iptables -t nat --flush
/etc/init.d/iptables save
(to save iptables to restore with no rules at boot)

Now, your computer should act switch like. I've tried it myself, with success!

Hi,

I am very happy to see your reply.

I need some information about this package. I wasted lot of time on this problem. I have left few days to reach my deadline.

I just want simple router that's it.
Please help me out.

Thanks,
Thiru

make sure ip tables are removed as shown in a previous message

on a redhat 9+ for fedora machine

edit /etc/sysctrl.conf

make sure these lines are correct
net.ipv4.ip_forward = 1
net.ipv4.conf.default.proxy_arp = 1

add your routes

route add -net 192.168.10.0 netmask 255.255.255.0 gw 192.16.10.1

to make it permanent

touch /etc/sysconfig/network-scripts/route-eth0

then

ip route show | grep eth0 | grep via | cut -d" " > \ /etc/sysconfig/network-scripts/route-eth0

Hi,

It seems you are a real practical person. It worked.

Thanks
Thiru