Network Router User Manual

Chapter 8: IP Routing Configuration Guide
84 SmartSwitch Router User Reference Manual
Monitoring RARP
You can use the following commands to obtain information about the SSR’s RARP
configuration:
Configuring DNS Parameters
The SSR can be configured to specify DNS servers, which supply name services for DNS
requests. You can specify up to three DNS servers.
To configure three DNS servers and configure the SSR’s DNS domain name to “mrb.com”:
Configuring IP Services (ICMP)
The SSR provides ICMP message capabilities including ping and traceroute. The ping
command allows you to determine the reachability of a certain IP host, while the
traceroute command allows you to trace the IP gateways to an IP host.
Configuring IP Helper
The ip helper-address command allows the user to forward specific UDP broadcast from
one interface to another. Typically, broadcast packets from one interface are not forwarded
(routed) to another interface. However, some applications use UDP broadcast to detect the
availability of a service. Other services, for example BOOTP/DHCP require broadcast
packets to be routed so that they can provide services to clients on another subnet. An IP
helper can be configured on each interface to have UDP broadcast packets forwarded to a
specific host for a specific service or forwarded to all other interfaces.
You can configure the SSR to forward UDP broadcast packets received on a given interface
to all other interfaces or to a specified IP address. You can specify a UDP port number for
which UDP broadcast packets with that destination port number will be forwarded. By
default, if no UDP port number is specified, the SSR will forward UDP broadcast packets
for the following six services:
Display the interfaces to which the
RARP server responds.
rarpd show interface
Display the existing MAC-to-IP
address mappings
rarpd show mappings
Display RARP statistics.
statistics show rarp <InterfaceName>|all
ssr(config)# system set dns server “10.1.2.3 10.2.10.12 10.3.4.5” domain
mrb.com