Troubleshooting guide

Troubleshooting TCP/IP
5-93
4. Look for an ip helper-address command entry for that router interface. Make
sure that the specified address is correct (it should be the IP address of a server
application such as a BOOTP server). If there is no command entry, no helper
address is configured.
5. If there is no IP helper address configured, or if the wrong address is specified,
add or change the helper address using the ip helper-address interface
configuration command. For example, to configure the IP address 10.10.10.0
as the helper address on router Ethernet interface 0, enter the following
commands:
RDN(config)#interface ethernet <slot>/<interface number>
where:
slot number refers to the SRM module slot number on the BSR 64000.
interface number refers to the ethernet interface number.
RDN(config-if)#ip helper-address 10.10.10.0
UDP Broadcast Misconfiguration
Specifying an IP helper address ensures that broadcasts from only a certain default
set of UDP ports are forwarded. UDP broadcasts forwarded out other ports require
further configuration.
1. For each applicable port, enter the ip forward-protocol udp port command
in Global Configuration mode on the BSR. For example, to forward UDP
broadcasts from port 200, enter the following command:
RDN(config)#ip forward-protocol udp 200
2. To allow forwarding of all UDP broadcasts, enter the following command:
RDN(config)#ip forward-protocol udp
Note: The BSR 1000 uses the same syntax as the above command,
however the ethernet interface slot and interface number are set to zero.