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Hey guys, I installed CentOS 5.7 and Snort on a machine with 2 NICS. I'm going to set up the network like this: Modem ===>Snort(IDS)===>Router===>Switch===>Network At the moment, I have ...
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- 10-20-2011 #1
Setting up 2-NIC forward for Snort
I installed CentOS 5.7 and Snort on a machine with 2 NICS. I'm going to set up the network like this:
At the moment, I have set up the 2 NICs like so:
eth0 = 192.168.1.181 (Internal)
eth1 = 192.168.110.2 (External)
Before I take down my network to put this in place, I need to make sure it is functioning correctly. I have another machine connected directly to eth1 and trying to test traffic.
I've been trying to find some CLEAR documentation on setting up a forward so traffic passes through both NICs without issue. I've tried following iptables tutorials, custom scripts, etc and it's just not working. Can anyone help me with this?
- 10-22-2011 #2
To turn on forwarding use the following:
echo 1 > /proc/sys/net/ipv4/ip_forward
To fix the system so that forwarding is on at startup you need to edit the sysctl.conf file.
Edit the file and look for:
# Controls IP packet forwarding net.ipv4.ip_forward = 0
# Controls IP packet forwarding net.ipv4.ip_forward = 1
There are other ways to turn on forwarding on the fly.
You can find these by GOGGLE'ing for them.
Google is your friend.
Also this is more a network question then a server question.
The adventure of a life time.
Linux User #296285