Configure Subnetwork Space Advanced Settings

Create or modify a subnetwork space. For more information, see Add a Subnetwork Space.

This task contains the next set of optional steps for creation of a new subnetwork space.

Select Enable DHCP to enable branch routers to dynamically provide client devices with network settings.
Enable the DHCP server on the routers to remove the necessity for additional hardware at remote sites.

When you select this option, additional configuration items appear.
1. Use the controls to select where you want your DHCP pool of addresses to begin and end.
  
  The left slide control reserves addresses at the start of the pool. The right slide control reserves addresses at the end of the pool. Below the slide control is the total number of remaining unreserved addresses in the pool.
  
  Note
  
  IP Address 172.28.0.1 is reserved for Extreme Networks routers and is not available to client devices.
2. Enter the DHCP address lease time.
3. Enter the NTP server's IP address that clients use to synchronize their system clocks.
4. Enter your network domain name.
5. Select Use ARP to check IP address conflicts to enable Extreme Networks routers functioning as DHCP servers to check if an IP address is in use before offering to lease it to a DHCP client.
  Clear to disable ARP broadcasts during the DHCP message exchange. You might do this if there are a large number of clients requesting DHCP leases and the extra effort to check address availability is unnecessarily consuming resources.
6. For Custom Options, enter standard (1 – 224) and custom (225 – 254) DHCP options.
  
  Note
  Options 1, 3, 6, 7, 15, 26, 42, 44, 51, 58, 59, 69, and 70 are not supported here because the information is automatically retrieved elsewhere.
7. Select Enable DHCP Relay to support a centralized DHCP server on a branch router.
  If you have deployed a centralized DHCP server on your network, you must first enable the DHCP relay on an Extreme Networks branch router to disable the branch router's DHCP server function. This enables the device to redirect client DHCP requests to a centralized DHCP server. The branch router now behaves as a proxy for client DHCP requests and no longer performs DHCP services. This is part of the DHCP Reservations and DHCP Relay feature.
Choose the DNS Service profile from the drop-down list.
If you do not see a service profile that you want to use, select the plus sign to create a new one. For more information about adding a DNS Service, see Configure a DNS Service.
Note
When the network type is for internal or guest use, an Extreme Networks router applies this service to the DNS requests from clients connecting to the router either directly or through an intermediary AP or switch. When the network type is management, the router applies this to DNS requests from Extreme Networks APs and switches on the same management network behind the router, and to the mgt0 interface of the router itself.
Select Enable NAT through the VPN tunnels to enable routers to perform NAT on traffic traversing their tunnel interfaces.

Note
If you selected Replicate the same subnetwork at each site, NAT is always enabled and this check box cannot be cleared.
1. Enter the number of branch sites you want to replicate.
2. Enter the NAT IP address space, which must be large enough to be mapped to the local subnetwork at every branch site of the local subnetwork IP address space.
Select SAVE.