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Proxy ARP
Network Address Translation (NAT)
6371-A2-GB20-00
The DSL router supports Proxy ARP. Proxy ARP responses are based on the IP
Routing table contents. The IP Routing table must have an entry for every host
that is reachable on the Ethernet interface, including hosts for which the DSL
router will not forward packets because of IP filters. If an ARP request is received
on one interface for an IP address that is reachable on the other interface, the
DSL router will respond with its own MAC address.
The Command Line Interface provides the ability to enable and disable Proxy
ARP for each interface.
NOTES:
— When Basic NAT is enabled, the DSL (d0) interface must have Proxy
ARP enabled if the d0 interface address is part of the Basic NAT global
IP network address.
— Proxy ARP and NAPT cannot be enabled at the same time.
Network Address Translation is used when a private network's internal IP
addresses cannot be used outside the private network. The IP addresses may be
restricted for privacy reasons or they may not be valid public IP addresses.
The DSL router provides NAT as described in RFC 1631 The IP Network Address
Translator (NAT). NAT allows the private (local) hosts to transparently access
public (global) external IP addresses.
Two variations of traditional NAT are supported:
H
Basic NAT
H
NAPT (Network Address Port Translation)
NOTE:
Basic NAT and NAPT cannot be enabled at the same time.
March 2000
Configuring the DSL Router
3-5
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