VMware GSX Server 2.5.2

Follow these steps to change the subnet of the DHCP server for the host-only network on VMnet1. In this example, you set the IP address of your host-only network to 192.168.3.1. To change the subnet used by a host-only DHCP server, you need to make the change to the IP address in two places: in the registry and in the vmnetdhcp.conf file.

1. Open the Windows registry.

   Choose Start > Run. Then type regedit.

2. Look for the registry key
   \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
   VMnetDHCP\Parameters\VirtualEthernetSegments\1.

   In that key, there is a value with the name HostIpAddress. The data is a hexadecimal value corresponding to the IP address of the host. Change this hexadecimal value to that of the new IP address. For example, the registry may contain the value 01dea8c0. This corresponds to the IP address 192.168.222.1.
   c0 = 192
   a8 = 168
   de = 222
   01 = 1

   Notice that the hexadecimal number seems backwards — with the pairs of digits in the opposite order from the way they are usually given when you write an IP address.

   Change the value of this registry key to 0103a8c0, which corresponds to 192.168.3.1.

3. Find the file vmnetdhcp.conf in the system directory. On most systems, this will be C:\WINNT\system32\vmnetdhcp.conf. Look for the text Virtual ethernet segment 1 in the file. Sample text from the file:

   # Virtual ethernet segment 1
   # Added at 07/05/01 14:30:18
   subnet 192.168.222.0 netmask 255.255.255.0 {
   range 192.168.222.128 192.168.222.254; # up to 126 VMs
   option broadcast-address 192.168.222.255;
   option domain-name-servers 192.168.222.1;
   option domain-name "localdomain";
   }
   host VMnet1 {
   hardware ethernet 00:50:56:C0:00:01;
   fixed-address 192.168.222.1;
   option domain-name-servers 0.0.0.0;
   option domain-name "";
   }

   Replace all instances of the old IP address — 192.168.222.1 — with the new IP address — 192.168.3.1 — as shown below.

   # Virtual ethernet segment 1
   # Added at 07/05/01 14:30:18
   subnet 192.168.3.0 netmask 255.255.255.0 {
   range 192.168.3.128 192.168.3.254; # up to 126 VMs
   option broadcast-address 192.168.3.255;
   option domain-name-servers 192.168.3.1;
   option domain-name "localdomain";
   }
   host VMnet1 {
   hardware ethernet 00:50:56:C0:00:01;
   fixed-address 192.168.3.1;
   option domain-name-servers 0.0.0.0;
   option domain-name "";
   }

4. Reboot the host computer so the new settings will take effect.

To make corresponding changes to the DHCP server for the NAT network, follow the same procedure, with these changes:

• Edit the registry key
  \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
  VMnetDHCP\Parameters\VirtualEthernetSegments\8.

• In vmnetdhcp.conf, edit the sections that begin with
  # Virtual ethernet segment 8
  and
  host VMnet8 {