This has been bothering me for a couple of days,
I have two subnets:
192.168.1.0/24 : This is the subnet used by my ISP/router. The gateway to the WAN is 192.168.1.1 192.168.2.0/24 : This is a subnet that I've created on my ESXi 5 virtual machine.
The physical machine that ESXi 5 is running on has two NIC's one NIC is connected to my ISP/router and the other is connected to another router with the DHCP server disabled. I'm using this second router just to keep the NIC status 'UP' from a vmware perspective.
I have a virtual Ubuntu 10.04 LTS running with two NIC's connected to it. The idea is that this will server as a router between the two subnets. I have DHCP running on the Ubuntu router that is dishing out IPs to my virtual machines using the 192.168.2.0 LAN.
The problem I'm having is that I can't seem to get the Ubuntu router to forward packets from one subnet to another. I should note I have tried every possible combination of configuration settings I can think of. My current set up is as follows:
I have run the command
echo 1 > /proc/sys/net/ipv4/ip_forward to enable packet forwarding.
My firewall looks like this:
root@gRouter:~# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination
My '/etc/network/interfaces' looks like this:
root@gRouter:~# cat /etc/network/interfaces auto lo eth0 eth1 iface lo inet loopback iface eth0 inet static address 192.168.1.105 network 192.168.1.0 netmask 255.255.255.0 up ip route add 192.168.2.0/24 via 192.168.1.105 iface eth1 inet static address 192.168.2.2 network 192.168.2.0 netmask 255.255.255.0 up ip route add 192.168.1.0/24 via 192.168.2.2
From this dual NIC router to be, I can ping between virtual machines within the 192.168.2.0 subnet and I can ping between virtual machines and physical machines on the 192.168.1.0 subnet. But I cannot ping from one subnet to another.
My routes table looks like this:
root@gRouter:~# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.2.0 * 255.255.255.0 U 0 0 0 eth1 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
My arp currently looks like this:
root@gRouter:~# arp -v Address HWtype HWaddress Flags Mask Iface 192.168.2.13 ether 00:0c:29:30:f4:d9 C eth1 192.168.2.10 ether 00:0c:29:bf:60:a3 C eth1 192.168.1.64 ether 38:59:f9:e7:a0:f5 C eth0 Entries: 3 Skipped: 0 Found: 3
When I try to ping from a machine in subnet 192.168.2.0 to a machine in 192.168.1.0 subnet, I immediately get the error message 'connect: Network is unreachable'
When I try to ping from a machine in subnet 192.168.1.0 to a machine in 192.168.2.0 subnet, the first ping is initiated but it just hangs indefinately.
Sorry for the long post, I hope I have given enough information. Really grateful for any help.
Thanks in advance.