Linux – Ubuntu Server gateway networking issues on VMware Workstation

interfacelinuxnetworkingUbuntuvmware-workstation

I have two Ubuntu 10 Server VMs on VMware Workstation, using bridged networking. I want to route internet traffic to ServerB through ServerA. At the moment, ServerA can access the internet, but not ServerB. Each server can successfully ping the other.

ServerA /etc/network/interfaces (skipping the irrelevant stuff):

# The primary network interface WAN
auto eth0
iface eth0 inet static
    address 192.168.1.134
    netmask 255.255.255.0
    network 192.168.1.0
    broadcast 192.168.1.255
    gateway 192.168.1.1

    # dns-* options are implemented by the resolvconf package, if installed
    dns-nameservers 192.168.1.1
    dns-search mydomain.com

# The secondary network interface LAN
auto eth1
iface eth1 inet static
    address 172.16.96.1
    netmask 255.255.255.0
    network 172.16.96.0
    broadcast 172.16.96.255

Forwarding is enabled in /etc/sysctl.conf

ServerB /etc/network/interfaces (skipping the irrelevant stuff):

# The primary network interface
auto eth0
iface eth0 inet static
    address 172.16.96.34
    netmask 255.255.255.0
    network 172.16.96.0
    broadcast 172.16.96.255
    gateway 172.16.96.1

    # dns-* options are implemented by the resolvconf package, if installed
    dns-nameservers 172.16.96.1
    dns-search mydomain.com

I've cleared out iptables on both machines, so that can be ruled out. Have I messed something up, or am I missing something vital (like a static route)?

Best Answer

A few suggestions,

  • Please see if the traffic from 172.16.96.0/24 goes out of eth0 on Server A.

  • Configure NAT on Server A using iptables for the 172.16.96.0/24 . Currently your traffic might go out from server A but won't get to return back for it takes the 172 network's IP when going out. Doing a NAT might help you here.

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