Alcatel-Lucent 7705 Configuration Manual page 24

Configuring IP Router Parameters
In order to support NAT and other edge-like environments, proxy ARP supports policies that
allow the provider to:
As an example, when a source NAT pool is configured with a dynamic IP pool with the
address range 1.1.1.2 to 1.1.1.254 on the public interface 1.1.1.1, proxy ARP can be used to
resolve the ARP request of the NAT pool hosts with the local interface (1.1.1.1) MAC address
(remote proxy ARP).
As another example, if a NAT pool of addresses in the range 2.2.2.1 to 2.2.2.100 is configured
on the public Layer 3 interface 128.251.10.59, then by enabling remote proxy ARP, the
7705 SAR will respond to ARP requests from hosts 2.2.2.1 to 2.2.2.100. In addition, a route
policy with a prefix list can be created and used as a proxy ARP policy for finer granularity
of the IP range for which proxy ARP is being used.
For detailed information on NAT, see NAT.
ETH-CFM Support
Ethernet Connectivity Fault Management (ETH-CFM) is defined in the IEEE 802.1ag and
ITU Y.1731 standards. ETH-CFM specifies protocols, procedures, and managed objects to
support fault management (including discovery and verification of the path), detection, and
isolation of a connectivity fault in an Ethernet network.
ETH-CFM requires the configuration of specific entities at the global level and at the Ethernet
service level and/or network interface level. Maintenance domains (MDs) and maintenance
associations (MAs) are configured at the global level. Maintenance association endpoints
(MEPs) are configured at the service level and network interface level.
MEPs that are not service-based are referred to as facility MEPs. A facility MEP is a Down
MEP that detects failure conditions for an Ethernet transport network using ETH-CCM and,
where appropriate, propagates alarm conditions so that the Epipe services that share this
common transport are aware of the failure. The 7705 SAR supports facility MEPs on network
interfaces.
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Note: Only remote proxy ARP is applicable for NAT.
• configure prefix lists that determine for which target networks proxy ARP will be
attempted
• configure prefix lists that determine for which source hosts proxy ARP will be
attempted
7705 SAR OS Router Configuration Guide