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Connecting two subnets using an Ubuntu 10.04 LTS as a router

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http://serverfault.com – 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 i (HowTos)

grtyyu's picture
Submitted by grtyyu on 05/16/2012

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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.

I have installed a small Linux server; the server is in a different subnet as the internet hosts. I added a route to my nat router to create a connection between both subnets.

I have 2 networks that I'd like to connect with a router/firewall to filter traffic between the two. One network is on a public subnet, let's say 64.22.12.192/27 and the other network is on a private subnet 192.168.0.0/24.

Our subnet is connected with other subnets with router. Using wireshark I see some arp requests coming to ip addresses of our subnet from the router. Such as

Broadcast ARP 60 Who has 10.162.3.172? Tell 10.162.0.1

Where 10.162.0.1 is the router. I want to determine the source computer from other subnet, which sends this requests. How can I perform it?

Using Windows Server 2012 Essentials.

I've got two ethernet ports. One is connected to a router which is connected to the internet. This portion of the network is fine. The router runs DHCP on the 192.168.1.x subnet, and provides a Company1 WiFi for guests, which does not have access to servers etc.

The idea is to have a second LAN, through the Windows server.

I have an ESXi server in which I have a network subnet 192.168.1.0/24 I want to add a subnet inside that subnet using a virtual linux router. The virtual linux router is running however it cannot see its one lan member.

I wonder if anybody has done a test like this before.

First I'd describe my subnet A:

a AD controller, say, adcontroller.mydomain with IP 192.168.1.3 a DHCP and DNS server, say, dhcpdns.mydomain with IP 192.168.1.10

Now I have a CISCO WRVS4400N wireless router, plug it through WAN port to the switch of subnet A.

Home Net Topology

ISP/WAN > Modem > Router (linksys) >Router(CISCO 851W) > (serial cable) 2008 R2

I have the loopback cable connected from my server to the CISCO router. The router is connected to the router in the office with a crossover cable. It is connected to Lan port 4 (Linksys) and the cable is plugged in to the WAN port(CISCO).

Setup:

L2TP VPN Server on a Windows Server 2008 machine which is behind a router, which is behind a modem/router.

Modem/Router (IP: 192.168.2.1, Subnet: 255.255.255.0, DHCP serves 192.168.2.2 to router) ----|_ Router (IP: 192.168.2.2, Subnet: 255.255.255.0, Sub LAN IP: 192.168.0.1, Sub LAN Subnet: 255.255.255.128, DHCP serves 192.168.0.* to computers) ------------|_ Windows Server 2008 (IP: 192.