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Configuring IP IP Forwarding

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 12-13

Note that when Local Proxy ARP is enabled for any one IP router interface associated with a VLAN, the

feature is applied to the entire VLAN. It is not necessary to enable it for each interface. However, if the IP

interface that has this feature enabled is moved to another VLAN, Local Proxy ARP is enabled for the

new VLAN and must be enabled on another interface for the old VLAN.

ARP Filtering

ARP filtering is used to determine whether or not the switch responds to ARP requests that contain a

specific IP address. This feature is generally used in conjunction with the Local Proxy ARP application;

however, ARP filtering is available for use on its own and/or with other applications.

By default, no ARP filters exist in the switch configuration. When there are no filters present, all ARP

packets are processed, unless they are blocked or redirected by some other feature.

Use the arp filter command to specify the following parameter values required to create an ARP filter:

• An IP address (e.g., 193.204.173.21) used to determine whether or not an ARP packet is filtered.

• An IP mask (e.g. 255.0.0.0) used to identify which part of the ARP packet IP address is compared to

the filter IP address.

• An optional VLAN ID to specify that the filter is only applied to ARP packets from that VLAN.

• Which ARP packet IP address to use for filtering (sender or target). If the target IP address in the ARP

packet matches a target IP specified in a filter, then the disposition for that filter applies to the ARP

packet. If the sender IP address in the ARP packet matches a sender IP specified in a filter, then the

disposition for that filter applies to the ARP packet.

• The filter disposition (block or allow). If an ARP packet meets filter criteria, the switch is either

blocked from responding to the packet or allowed to respond to the packet depending on the filter

disposition. Packets that do not meet any filter criteria are responded to by the switch.

The following arp filter command example creates an ARP filter, which will block the switch from

responding to ARP packets that contain a sender IP address that starts with 198:

-> arp filter 198.0.0.0 mask 255.0.0.0 sender block

Up to 200 ARP filters can be defined on a single switch. To remove an individual filter, use the no form of

the arp filter command. For example:

-> no arp filter 198.0.0.0

To clear all ARP filters from the switch configuration, use the clear arp filter command. For example:

-> clear arp filter

Use the show arp filter command to verify the ARP filter configuration. For more information about this

and other ARP filter commands, see the OmniSwitch CLI Reference Guide.

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