# Administration Reference

## NetRestrict (server version)

Purpose

Defines interfaces that File Server does not register in VLDB and Ubik does not use for database server machines

Description

The NetRestrict file, if present in the /usr/afs/local directory, defines the following:

- On a file server machine, the local interfaces that the File Server (fileserver process) does not register in the Volume Location Database (VLDB) at initialization time

- On a database server machine, the local interfaces that the Ubik synchronization library does not use when communicating with the database server processes running on other database server machines

As it initializes, the File Server constructs a list of interfaces to register, from the /usr/afs/local/NetInfo file if it exists, or from the list of interfaces configured with the operating system otherwise. The File Server then removes from the list any addresses that appear in the NetRestrict file, if it exists. The File Server records the resulting list in the /usr/afs/local/sysid file and registers the interfaces in the VLDB. The database server processes use a similar procedure when initializing, to determine which interfaces to use for communication with the peer processes on other database machines in the cell.

The NetRestrict file is in ASCII format. One IP address appears on each line, in dotted decimal format. The order of the addresses is not significant. The value 255 is a wildcard that represents all possible addresses in that field. For example, the value 192.12.105.255 indicates that the Cache Manager does not register any of the addresses in the 192.12.105 subnet.

To display the File Server interface addresses registered in the VLDB, use the vos listaddrs command.

Related Information

NetInfo (server version)

sysid

vldb.DB0 and vldb.DBSYS1

fileserver

vos listaddrs

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