Icmp; Configuration Tasks For Icmp; Enabling Icmp Unreachable Messages; Udp Helper - Dell S4048–ON Configuration Manual

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CONFIGURATION mode

arp backoff-time

The default is 30.

The range is from 1 to 3600.

Display all ARP entries learned via gratuitous ARP.

EXEC Privilege mode

show arp retries

ICMP

For diagnostics, the internet control message protocol (ICMP) provides routing information to end stations 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 only on unicast traffic.

The following lists the configuration tasks for ICMP.

For a complete listing of all commands related to ICMP, refer to the Dell Networking OS Command Line Reference Guide.

Enabling ICMP Unreachable Messages

By 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 mode

no ip unreachable

Set Dell Networking OS to create and send ICMP unreachable messages on the interface.

INTERFACE mode

ip unreachable

To view if ICMP unreachable messages are sent on the interface, use the show config command in INTERFACE mode. If it is not listed

in the show config command output, it is enabled. Only non-default information is displayed in the show config command output.

User datagram protocol (UDP) helper allows you to direct the forwarding IP/UDP broadcast traffic by creating special broadcast addresses

and rewriting the destination IP address of packets to match those addresses.

To configure Dell Networking OS to direct UDP broadcast, enable UDP helper and specify the UDP ports for which traffic is forwarded. See

Enabling UDP Helper

IPv4 Routing