- Thomson Wireless DSL Routers User's Guide

Chapter 5
Expert Configuration
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DHCP Relay The DHCP relay tab allows you to add/delete and overview SpeedTouch™ 's DHCP
relay interfaces.
The DHCP relay configuration is split up in two sections:
 Relay Config
To add/delete and configure a DHCP relay server on a certain interface
 Relay Interfaces
To enable/disable and define the behaviour of the DHCP relay agent per
configured interface.
Relay Config The Relay Configuration table allows you to add or delete (additional) DHCP relay
agents for a specific interface.
To create a new DHCP relay agent:
1 Click New.
2 In the DHCP relay server box, type the IP address of the DHCP server.
3 In the Interface list, click the appropriate relay interface (click None to indicate
no interface is specified).
4 In the Gateway Address (giaddr) box, type the Gateway IP address to be used
for the giaddr field in relayed DHCP packets.
5 Click Apply.
Relay Interfaces The Relay Interfaces table allows you to configure interface specific DHCP relay
settings as:
 Enable/disable the DHCP relay server
 The maximum number of hops allowed for relayed DHCP requests and replies
(as indicated in the DHCP packet)
 Defining whether to forward (trusted) or to drop (not trusted) DHCP request
packets when a DHCP relay agent info option is present and the Gateway IP
address field is 0 (as specified in RFC3046).
 Define the remote ID (as specified in RFC3046) to allow the DHCP relay agent
to relay DHCP responses to the proper network.