I have 3 NICs
1 is 192.168.2.X
2 is 192.168.3.X
3 is the outside world (and default gateway)
I can ping hosts on either network from my linux host machine.
But a machine on 3.X cannot ping across to 2.X
I know I have to tell the linux machine to send packets from one network to the other, but I cannot figure out how to do it in Yast.
You help would be most appreciated.
Thanks
You want to make your system into a router. I have no experience doing this, but without doubt other will come herte to hlp you. In the meantime you could try searches with “making linux router” or the like.
Thanks for your reply.
I’ve been googling the subject and confusing myself even more.
My routing table looks like:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
host81-136-166- * 255.255.255.248 U 0 0 0 eth3
192.168.3.0 192.168.3.2 255.255.255.0 UG 0 0 0 eth1
192.168.2.0 gateway 255.255.255.0 UG 0 0 0 eth2
link-local * 255.255.0.0 U 0 0 0 eth1
loopback * 255.0.0.0 U 0 0 0 lo
default host81-136-166- 0.0.0.0 UG 0 0 0 eth3
And if have ip forwarding on.
As I said, I can ping hosts on each network from the router, but hosts on each subnet are not aware of each other. I cannot ping from one to the other.
There is no firewall getting in the way at the moment.
Cheers
Again, am not a “build a router into your Linux system” guru (hope one comes to the rescue here), but at least the systems inside both networks should have a route to your system. So their routing tables are even more important then yours.
stovesy wrote:
>
> Thanks for your reply.
>
> I’ve been googling the subject and confusing myself even more.
>
> My routing table looks like:
>
> Code:
> --------------------
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> Iface
> host81-136-166- * 255.255.255.248 U 0 0 0
> eth3
> 192.168.3.0 192.168.3.2 255.255.255.0 UG 0 0 0
> eth1
> 192.168.2.0 gateway 255.255.255.0 UG 0 0 0
> eth2
> link-local * 255.255.0.0 U 0 0 0
> eth1
> loopback * 255.0.0.0 U 0 0 0
> lo
> default host81-136-166- 0.0.0.0 UG 0 0 0
> eth3
> --------------------
>
>
> And if have ip forwarding on.
>
> As I said, I can ping hosts on each network from the router, but hosts
> on each subnet are not aware of each other. I cannot ping from one to
> the other.
>
> There is no firewall getting in the way at the moment.
>
> Cheers
>
>
as root
there’s probably a way of enabling ip_forwarding via YaST but off-hand I
don’t know where it is - probably something to do with the firewall or
network device configuration
Alan
In OpenSUSE, edit the file /etc/sysconfig/sysctl to have
IP_FORWARD="yes"
IPV6_FORWARD="yes"
ip_forward has been set since the start.
OK
It works with the following route table
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
host81-136-166- * 255.255.255.248 U 0 0 0 eth3
192.168.3.0 192.168.3.2 255.255.255.0 UG 0 0 0 eth1
192.168.3.0 * 255.255.255.0 U 0 0 0 eth1
192.168.2.0 gateway 255.255.255.0 UG 0 0 0 eth2
192.168.2.0 * 255.255.255.0 U 0 0 0 eth2
link-local * 255.255.0.0 U 0 0 0 eth1
loopback * 255.0.0.0 U 0 0 0 lo
default host81-136-166- 0.0.0.0 UG 0 0 0 eth3
The above was done by deleting the routes added by YAST, and then the following commands
route add -net 192.168.2.0 netmask 255.255.255.0 gw 192.168.2.2 dev eth2
route add -net 192.168.3.0 netmask 255.255.255.0 gw 192.168.3.2 dev eth1
I’m guessing that YAST needs some more info in order to recreate the table above, but what, I don’t know.
Getting further anyways.
Cheers.