• Set the number of ARP retries.CONFIGURATION modearp retries numberThe default is 5.The range is from 1 to 20.• Set the exponential timer for resending unresolved ARPs.CONFIGURATION modearp backoff-timeThe default is 30.The range is from 1 to 3600.• Display all ARP entries learned via gratuitous ARP.EXEC Privilege modeshow arp retriesICMPFor diagnostics, the internet control message protocol (ICMP) provides routing information to endstations by choosing the best route (ICMP redirect messages) or determining if a router is reachable(ICMP Echo or Echo Reply).ICMP error messages inform the router of problems in a particular packet. These messages are sent onlyon unicast traffic.Configuration Tasks for ICMPThe following lists the configuration tasks for ICMP.• Enabling ICMP Unreachable MessagesFor a complete listing of all commands related to ICMP, refer to the Dell Networking OS Command LineReference Guide.Enabling ICMP Unreachable MessagesBy default, ICMP unreachable messages are disabled.When enabled, ICMP unreachable messages are created and sent out all interfaces.To disable and re-enable ICMP unreachable messages, use the following commands.• To disable ICMP unreachable messages.INTERFACE modeno ip unreachable• Set Dell Networking OS to create and send ICMP unreachable messages on the interface.INTERFACE modeIPv4 Routing 431
