TTL Hostname Probe1 Probe2 Probe31 10.11.199.190 001.000 ms 001.000 ms 002.000 ms2 gwegress-sjc-02.force10networks.com (10.11.30.126) 005.000 ms 001.000 ms001.000 ms3 fw-sjc-01.force10networks.com (10.11.127.254) 000.000 ms 000.000 ms 000.000 ms4 www.dell.com (10.11.84.18) 000.000 ms 000.000 ms 000.000 msDell#ARPThe system uses two forms of address resolution: address resolution protocol (ARP) and Proxy ARP.ARP runs over Ethernet and enables endstations to learn the MAC addresses of neighbors on an IP network.Over time, the system creates a forwarding table mapping the MAC addresses to their corresponding IPaddress. This table is called the ARP Cache and dynamically learned addresses are removed after a definedperiod of time.For more information about ARP, refer to RFC 826, An Ethernet Address Resolution Protocol.Proxy ARP enables hosts with knowledge of the network to accept and forward packets from hosts thatcontain no knowledge of the network. Proxy ARP makes it possible for hosts to be ignorant of the network,including subnetting.For more information about Proxy ARP, refer to RFC 925, Multi-LAN Address Resolution, and RFC 1027, UsingARP to Implement Transparent Subnet Gateways.Configuration Tasks for ARPFor a complete listing of all ARP-related commands, refer to the Dell Networking OS Command LineReference Guide.Configuration tasks for ARP include:• Configuring Static ARP Entries (optional)• Configuring ARP Inspection Trust• Configuring ARP Retries• Configuring the Timer for Resending Unresolved ARPs• Enabling Proxy ARP (optional)• Clearing ARP Cache (optional)• ARP Learning via Gratuitous ARP• ARP Learning via ARP Request• Configuring ARP RetriesConfiguring Static ARP EntriesARP dynamically maps the MAC and IP addresses, and while most network host support dynamic mapping,you can configure an ARP entry (called a static ARP) for the ARP cache.To configure a static ARP entry, use the following command.IPv4 Routing 554
