Hello,
I want my Linux Ubuntu Server act as an internal router, so routing between two local subnets, no NAT.
This is what I have:
/etc/network/interfaces
Code:
auto eth0
iface eth0 inet static
address 192.168.1.2
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
auto eth1
iface eth1 inet static
address 172.16.0.1
netmask 255.255.0.0
network 172.16.0.0
broadcast 172.16.0.255
route
Code:
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
172.16.0.0 * 255.255.0.0 U 0 0 0 eth1
default 192.168.1.1 0.0.0.0 UG 100 0 0 eth0
I have no IPTABLES configured:
Code:
Chain INPUT (policy ACCEPT 39642 packets, 1707K bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 6 packets, 288 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 39796 packets, 19M bytes)
pkts bytes target prot opt in out source destination
Output of the sudo cat /proc/sys/net/ipv4/ip_forward
1
I also configured the dhcp server to only listen on interface eth1.
When I connect my laptop to the server, I recieve following IP address:
address: 172.16.0.2
mask: 255.255.0.0
gateway: 172.16.0.1
DNS: 172.16.0.1
I can ping the eth1 interface:
ping 172.16.0.1 => success!
I ALSO can ping the eth0 interface: (still from the same laptop)
ping 192.168.1.2 => success!
But when I attached another laptop using static IP at eth0,
I'm UNABLE to connect...
ping 192.168.1.5 => fail!
So apperantly, it does not forward the packets...
What am I doing wrong?
Here's a scheme:
Internet -> NAT router -> network 1 -> eth0 LINUX ROUTER eth1 -> network 2
Thanks!
