Module address

The Address Translation Group

Implementation of the Address Translation group is mandatory for all systems. Note however that this group is deprecated by MIB-II. That is, it is being included solely for compatibility with MIB-I nodes, and will most likely be excluded from MIB-III nodes. From MIB-II and onwards, each network protocol group contains its own address translation tables.

The Address Translation group contains one table which is the union across all interfaces of the translation tables for converting a NetworkAddress (e.g., an IP address) into a subnetwork-specific address. For lack of a better term, this document refers to such a subnetwork-specific address as a “physical” address.

Examples of such translation tables are: for broadcast media where ARP is in use, the translation table is equivalent to the ARP cache; or, on an X.25 network where non-algorithmic translation to X.121 addresses is required, the translation table contains the NetworkAddress to X.121 address equivalences.

Structs

Entry

Each entry contains one NetAddress to PhysAddress equivalence.

Index

The interface on which this entry’s equivalence is effective. The interface identified by a particular value of this index is the same interface as identified by the same value of interfaces::Index.

NetAddress

The NetworkAddress (e.g., the IP address) corresponding to the media-dependent PhysAddress.

PhysAddress

The media-dependent `physical’ address.

Table

The Address Translation tables contain the NetworkAddress to “physical” address equivalences. Some interfaces do not use translation tables for determining address equivalences (e.g., DDN-X.25 has an algorithmic method); if all interfaces are of this type, then the Address Translation table is empty, i.e., has zero entries.