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- Frame Relay (FR) support for linux is built into a two tiered system of device
- drivers. The upper layer implements RFC1490 FR specification, and uses the
- Data Link Connection Identifier (DLCI) as its hardware address. Usually these
- are assigned by your network supplier, they give you the number/numbers of
- the Virtual Connections (VC) assigned to you.
- Each DLCI is a point-to-point link between your machine and a remote one.
- As such, a separate device is needed to accommodate the routing. Within the
- net-tools archives is 'dlcicfg'. This program will communicate with the
- base "DLCI" device, and create new net devices named 'dlci00', 'dlci01'...
- The configuration script will ask you how many DLCIs you need, as well as
- how many DLCIs you want to assign to each Frame Relay Access Device (FRAD).
- The DLCI uses a number of function calls to communicate with the FRAD, all
- of which are stored in the FRAD's private data area. assoc/deassoc,
- activate/deactivate and dlci_config. The DLCI supplies a receive function
- to the FRAD to accept incoming packets.
- With this initial offering, only 1 FRAD driver is available. With many thanks
- to Sangoma Technologies, David Mandelstam & Gene Kozin, the S502A, S502E &
- S508 are supported. This driver is currently set up for only FR, but as
- Sangoma makes more firmware modules available, it can be updated to provide
- them as well.
- Configuration of the FRAD makes use of another net-tools program, 'fradcfg'.
- This program makes use of a configuration file (which dlcicfg can also read)
- to specify the types of boards to be configured as FRADs, as well as perform
- any board specific configuration. The Sangoma module of fradcfg loads the
- FR firmware into the card, sets the irq/port/memory information, and provides
- an initial configuration.
- Additional FRAD device drivers can be added as hardware is available.
- At this time, the dlcicfg and fradcfg programs have not been incorporated into
- the net-tools distribution. They can be found at ftp.invlogic.com, in
- /pub/linux. Note that with OS/2 FTPD, you end up in /pub by default, so just
- use 'cd linux'. v0.10 is for use on pre-2.0.3 and earlier, v0.15 is for
- pre-2.0.4 and later.
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