NetRestrict - Defines interfaces not to register with AFS servers

There are two NetRestrict files, one for an AFS client and one for an AFS File Server or database server. The AFS client NetRestrict file specifies the IP addresses that the client should not register with the File Servers it connects to. The server NetInfo file specifies what interfaces should not be registered with AFS Database Servers or used to talk to other database servers.

The NetRestrict file, if present in a client machine's /etc/openafs directory, defines the IP addresses of the interfaces that the local Cache Manager does not register with a File Server when first establishing a connection to it. For an explanation of how the File Server uses the registered interfaces, see the NetInfo(5) manpage.

As it initializes, the Cache Manager constructs a list of interfaces to register, from the /etc/openafs/NetInfo file if it exists, or from the list of interfaces configured with the operating system otherwise. The Cache Manager then removes from the list any addresses that appear in the NetRestrict file, if it exists. The Cache Manager records the resulting list in kernel memory.

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 CW255 is a wildcard that represents all possible addresses in that field. For example, the value CW192.12.105.255 indicates that the Cache Manager does not register any of the addresses in the CW192.12.105 subnet.

To display the addresses the Cache Manager is currently registering with File Servers, use the fs getclientaddrs command.

The NetRestrict file, if present in the /etc/openafs/server-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 /etc/openafs/server-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 /etc/openafs/server-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 CW255 is a wildcard that represents all possible addresses in that field. For example, the value CW192.12.105.255 indicates that the File Server or database server processes do not register or use any of the addresses in the CW192.12.105 subnet.

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

the sysid(5) manpage, the vldb.DB0(5) manpage, the fileserver(8) manpage, the fs_getclientaddrs(1) manpage the vos_listaddrs(1) manpage

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