VMWare ESXi virtual machine can contact the gateway but not the DNS server
- by Nathan Palmer
I am having a bit of a strange issue. I have a VMWare ESXi server with two virtual machines running on it. They are running just fine and can communicate on the network without a problem.
I am now trying to add a third. I am installing Ubuntu 8.04 Server. I assign it a static IP address and it's a fresh installation. Once installed I can ping the gateway but I cannot ping the DNS server. It's on the same network with the other two VMs which are communicating just fine. I have tried to reinstall the operating system but it still fails to connect.
Here is /etc/network/interfaces
auto eth0
iface eth0 inet static
address 192.168.1.23
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
dns-nameservers 208.67.222.222 #opendns
dns-search mydomain.com
Here is route
Destination | Gateway | Genmask | Flags | Metric | Ref | Use | Iface
localnet | * | 255.255.255.0 | U | 0 | 0 | 0 | eth0
default | 192.168.1.1 | 0.0.0.0 | UG | 100 | 0 | 0 | eth0
Since I'm running this behind a FortiGate this is what the sniff command gives me when I try to ping 208.67.222.222
arp who-has 192.168.1.1 tell 192.168.1.23
arp reply 192.168.1.1 is-at MAC
192.168.1.23 -> 208.67.222.222: icmp: echo request
192.168.1.23 -> 208.67.222.222: icmp: echo request
192.168.1.23 -> 208.67.222.222: icmp: echo request
192.168.1.23 -> 208.67.222.222: icmp: echo request
192.168.1.23 -> 208.67.222.222: icmp: echo request
As you can see it looks like I never get a response. One interesting thing I notice is the arp reply's MAC doesn't look right. I have cleared the FortiGate's ARP cache though and checked the entry and it seems correct. The MAC it lists is the one for the router. However if I ping from a different virtual machine that is also Ubuntu 8.04 with a nearly identical configuration I get this.
192.168.1.22 -> 208.67.222.222: icmp: echo request
208.67.222.222 -> 192.168.1.22: icmp: echo reply
192.168.1.22 -> 208.67.222.222: icmp: echo request
208.67.222.222 -> 192.168.1.22: icmp: echo reply
192.168.1.22 -> 208.67.222.222: icmp: echo request
208.67.222.222 -> 192.168.1.22: icmp: echo reply
So, what could I be missing?
Thanks.
