Typical Dhcp Server Application - Avaya G250 Administration

The Avaya G250/G350 Media Gateway can function as a DHCP server or as a DHCP relay or
both simultaneously, with each interface configured in either DHCP server mode or DHCP relay
mode. For example, you can configure the G250/G350 to provide DHCP service to voice
devices while DHCP requests by data devices are routed to a central remote DHCP server
using DHCP relay.
The Avaya G250/G350 Media Gateway can function as a DHCP server or as a DHCP client, or
both simultaneously. For information about configuring DHCP server on the G250/G350, see
Configuring DHCP server
G250/G350, see

Typical DHCP server application

In the typical application shown in
server and router for IP phones and PCs in the branch office. The remote DHCP server
allocates IP addresses for headquarters users. In case of WAN failure, the local DHCP server
can still allocate IP addresses in the branch offices. If there is a local ICC or LSP, calls can still
be made. If there is no ICC or LSP to control calls, the DHCP server can allocate IP addresses
to all devices, but, since no calls can be made, the IP address allocation effectively applies to
PCs only.
Figure 39: G250/G350 as server and router
S8700/S8300
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TFTP Server
134.1.159.21
The branch DHCP server does not depend on the headquarters' DHCP server. There is no
backup mechanism between the servers. The branch DHCP server operates continually
regardless of the status of the centralized DHCP server or the WAN link.
By default, the DHCP server is inactive. Before activating DHCP server, you configure DHCP
pools to define ranges of IP addresses and other network configuration information to be
assigned to clients. Create a minimum of two dynamic pools: at least one pool for data devices
(PCs) and at least one pool for voice devices (IP phones). The G250/G350 also supports
reservation pools, which map hardware addresses/client identifiers to specific IP addresses.
Reservation pools may be required for security issues or VPN appliances.
on page 424. For information about configuring DHCP client on the
Configuring DHCP client
Figure
Router
134.1.158.1 134.1.157.3
134.1.159.1
LAN
DHCP Server
134.1.159.20
Headquarters
on page 180.
39, the G250/G350 is configured as a local DHCP
T1/E1 or USP WAN Module
134.1.157.2
G250/G350 DHCP Server
S8300
Small Branch
Configuring DHCP server
DCP
Telephone
d
IP Telephone
PC Station
134.1.156.3
Issue 3 February 2007 425