ip forwarding linux

Hello,

i want to connect a 192.168.0.0 subnet to a 10.155.20.0 subnet with a PC
running current Debian. Therefore i have a eth0 at 192.168.0.10 and a
eth1 at 10.155.20.1. IP forwarding is activated in /etc/network/options
and /proc/sys/net/ipv4/ip_forward.
route -n gives:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.155.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0


Standard Gateways are 192.168.0.10 and 10.155.20.1 in subnets.

Ping from a 10... machine to a 192.. machine doesnt work.
I spent the whole day looking for a good tutorial which I also
understand, but found nothing helpful.
What else do I need to route packets between the two subnets?

Carina

Carina Ehrmann wrote:
> Hello,
>
> i want to connect a 192.168.0.0 subnet to a 10.155.20.0 subnet with a PC
> running current Debian. Therefore i have a eth0 at 192.168.0.10 and a
> eth1 at 10.155.20.1. IP forwarding is activated in /etc/network/options
> and /proc/sys/net/ipv4/ip_forward.
> route -n gives:
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> 10.155.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
> 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
>
> Standard Gateways are 192.168.0.10 and 10.155.20.1 in subnets.
>
> Ping from a 10... machine to a 192.. machine doesnt work.
> I spent the whole day looking for a good tutorial which I also
> understand, but found nothing helpful.
> What else do I need to route packets between the two subnets?

The machines on each subnet need to know that the Linux box is the
router. Does your 10.155.20.x machine know that the Linux eth1 address
(10.155.20.1?) is its gateway for 192.168.0.0/24? Does your 192.168.0.x
machine know that the Linux eth0 address (192.168.0.10?) is its gateway
for 10.155.21.0/24?

Allen Kistler schrieb:
>
> The machines on each subnet need to know that the Linux box is the
> router. Does your 10.155.20.x machine know that the Linux eth1 address
> (10.155.20.1?) is its gateway for 192.168.0.0/24? Does your 192.168.0.x
> machine know that the Linux eth0 address (192.168.0.10?) is its gateway
> for 10.155.21.0/24?
>

the machines are Windows machines with standard gateway set to
10.155.20.1 / 192.168.0.10

My problem has changed now. Ip forwarding works fine now with ipchains
-A forward -j MASQ. I can ping now 192.168.0.x machines from the
10.155.20.0 net and vice versa. I can reach my webserver on 192.168.0.5
from 10.155.20.x. But I cannot reach internet via a dsl router at
192.168.0.1 from the 10.155.20.0 subnet. I can ping this router from
10.155.20.x, but my browser tells me not being able to resolve the
entered url.

Carina Ehrmann schrieb:

> My problem has changed now. Ip forwarding works fine now with ipchains
> -A forward -j MASQ. I can ping now 192.168.0.x machines from the
> 10.155.20.0 net and vice versa. I can reach my webserver on 192.168.0.5
> from 10.155.20.x. But I cannot reach internet via a dsl router at
> 192.168.0.1 from the 10.155.20.0 subnet. I can ping this router from
> 10.155.20.x, but my browser tells me not being able to resolve the
> entered url.
>

solved. I entered 192.168.0.1 as DNS Server on the 10.155.20. machine