ADTRAN 1200350L1 UDP Relay/UDP Relay List, UDP Relay List/UDP Port Type, IP/Proxy ARP, Specified

Chapter 4: Configuration Overview

UDP Relay/UDP Relay List

Up to four relay destination servers can be specified in this list.

UDP Relay List/Relay Address Write security: 3; Read security: 5

This is the IP address of the server that will receive the relay packet.

UDP Relay List/UDP Port Type

Write security: 3; Read security: 5

Standard (def)

The following standard UDP protocols are relayed when set:

•DHCP, TFTP, DNS,

•NTP (NetworkTime Protocol, port 123). NBNS (NetBIOS Name Server, port 137), NBDG (NetBIOS Datagram, port 138),

•BootP.

Specified

•When set, the UDP port (1 to 65535) can be specified in the UDP Port columns (up to a maximum of three per server).

UDP Relay List/UDP Port 1, UDP Port 2, UDP Port 3 Write security: 3; Read security: 5

UDP Port 1, UDP Port 2, and UDP Port 3 are used for specifying UDP ports to be relayed. These fields only apply when UDP Port Type is set to Specified.

IP/Proxy ARP

Write security: 4; Read security: 5

This feature allows the network portion of a group of addresses to be shared between several physical network segments. The ARP protocol itself provides a way for devices to create a mapping be- tween physical (i.e., Ethernet) addresses and logical IP addresses.

Proxy ARP makes use of this mapping feature by instructing a rout- er to answer ARP requests as a “proxy” for the IP addresses behind one of its ports. The device which sent the ARP request will then correctly assume that it can reach the requested IP address by send- ing packets to the physical address that was returned to it. This tech- nique effectively hides the fact that a network has been (further) subnetted.

61200350L1-1 Router Option Module User Manual 4-9