User's Manual

Avaya Branch Gateway Manager 10.0 Page 152
15-601011 Issue 29r (Friday, November 02, 2012)B5800 Branch Gateway
5.3.2.5 DHCP Pools
DHCP pools allows the configuration of up to 8 ranges of IP addresses for allocation by the system when acting as a
DHCP server. By default the DHCP settings (IP Address, IP Mask and Number of DHCP IP Addresses) set on the LAN
Settings tab are reflected by the first pool here.
· For support of PPP Dial In address requests, at least one of the pools must be on the same subnet as the system's
LAN. Only addresses from a pool on the same subnet as the system's own LAN address will be used for PPP Dial
In.
Usability
· Mergeable: These settings are not mergeable. Changes to these settings will require a reboot of the system.
Configuration Settings
· Apply to Avaya IP Phones Only: Default = Off.
If this option is selected, the DHCP addresses are only used for requests from Avaya IP phones. Other devices
connected to the system LAN will have to use static addresses or obtain their address from another DHCP server.
· In addition to the above control, Avaya IP phones will only complete DHCP against a DHCP server configured to
supports a Site Specific Option Number (SSON) that matches that set on the phone. The SSON numbers supported
by the system DHCP are set on the VoIP sub-tab.
· DHCP Pool
Up to 8 pools can be added. The first pool matches the IP Address, IP Mask and Number of DHCP IP Addresses on the
LAN Settings sub-tab. When adding or editing pools, Branch Gateway Manager will attempt to warn about overlaps
and conflicts between pools.
· Start Address
Sets the first address in the pool.
· Subnet Mask: Default = 255.255.255.0
Sets the subnet mask for addresses issued from the pool.
· Default Router: Default = 0.0.0.0
For pools issuing IP addresses on the same subnet as the system LAN's, 0.0.0.0 instructs the system to
determined the actual default router address to issue by matching the IP address/subnet mask being issued in the
IP Routing table. This matches the default behaviour used by systems without multiple pools. For pools issuing
addresses not on the same subnet as the system LAN's, the default router should be set to the correct value for
devices on that subnet.
· Pool Size: Default = 0
Set the number of DHCP client addresses available in the pool.
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