[Herefordshire] Routing two subnets

[Malcolm Herbert]

1. check that you have IP forwarding enabled
in Fedora, you would add / edit the following in /etc/sysctl.conf

	# Controls IP packet forwarding
	net.ipv4.ip_forward = 1

then run 'sysctl -p'

Alternatively you can
	
	echo 1 > /proc/sys/net/ipv4/ip_forward

but you'll need to add it to /etc/rc.local to make it persistent across
reboots (if your distro hasn't got /etc/sysctl,conf)

2. As you have assigned local interfaces to each of the subnets, you
shouldn't have to add any static routes, therefore 'netstat -rn' should
show you a couple of lines with something like...

10.0.0.0   10.0.0.253  255.255.255.0   UG   0 0    0 eth0
10.0.1.0   10.0.1.253  255.255.255.0   UG   0 0    0 eth1



On Thu, 2004-10-28 at 17:04, Chris Bond wrote:
> Anybody got the quick guide to routing two subnets...
> 
> Zebra is announcing the correct router ie. 10.0.0.x segment use 10.0.0.253
> and 10.0.1.x segment use 10.0.1.253 gw.
> 
> Subnet 1 -> 10.0.0.x (linux NIC 10.0.0.253) Subnet Mask 255.255.255.0
> Subnet 2 -> 10.0.1.x (linux NIC 10.0.1.253) Subnet Mask 255.255.255.0
> 
> So if im on segment 10.0.0.x I need to ping segment 10.0.1.x and vis-versa.
> Im pritty sure RIP part is working just need to get linux to fwd the
> packets.  Any ideas cos google is returning too much crap =)
> 
> Kind Regards,
> Chris Bond
> 
> 
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> Herefordshire at mailman.lug.org.uk
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Dr Malcolm Herbert
Manager, Client Development             GPS, Red Hat Europe
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