At some point in the past, this stack was derived from item 1 and now it lives a separate life. Why is it different from the clock rate? In the Linux 2. Or, perhaps you’d better get my own cut – a modified sethdlc and dscc4. That’s where the open-source hardware driver by Francois Romieu got its name. Essentially, all of the funny encaps work just the same – you only have to set the same parameters at the two devices that you have connected back to back.

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Linnux, the receive and transmit modes may be different hw: There’s a single quartz oscillator per board per four channels. In other words, these six-or-so entries hide almost completely separate HDLC stacks – except that many of them use syncppp.

Generic PPP for Generic HDLC [1/3]

Beware – this DTE cable is quite a poor hack. It then shifts the gears accordingly to meet that intention.

The compile-time problem with sethdlc v. The Baycom modems do not need DMA. And such is my first proven-to-work testbed. The user-space ipppd is a mod of the original pppd, now a separate development branch. At least, that’s what the kernel documentation on ISDN seems to say.

An excellent source of connector pinouts liux the Hardware Book page. In contrast to that belief, sync serial adapter boards for the PC have been around for quite some time now, with many interface types, from a number of vendors. Before actually discussing the individual items of the list above, let me reiterate that my goal in this mini-HOWTO is to set up a very basic IP-over-sync-serial functionality.


The “wan router” support indeed seems to be quite generic and hardware-independent, with some interesting features. To help achieve this, there are two utilities: The first combination I tried was a RedHat8.

The souncard modem driver however reserves the card only when the interface is started, i. To quote Francois Romieu: The Etinc software seems to have decent link state handling. In all setups, the ping hclc were just fine, corresponding to the expected serialization delay.

Would it perhaps add some FR bridging functionality to the system? My proven-to-work kernels are 2. Ndlc FrameRelay base interface does have a “reliable” flag and the FR PVC does have an “active” flag, but I doubt that these would hold anything resembling the link integrity status that we’re after.

When a link liunx down on a particular interface, any static routes pointing to that interface remain in the master config table, but are excluded from the preprocessed real-time switching tables.


Our Linux driver software is divided into two parts: With TX frames, it works the other way around – the driver doesn’t have to deal directly with the sync streaming hlc bits, it just passes HDLC frames to the hardware. Such a circuit can provide precise yet programmable clock frequency.


On Linux, there are only two attributes: Commtech card seems to offer this feature. Typical values for the sbc modems are 1 or 0 and for the wss modems, any free DMA from 0 to 3 except 2 will do. For a start, I merely wanted to sum up my findings while I was trying to get my setup to work, so that other people wouldn’t have to do the whole research allover again.

Cisco is quite liberal about putting documentation about its products on the web, most of lihux even in the public lnux, rather than in the password-protected partner access zone.

Linux Dscc4+HDLC Mini-HOWTO

In general and in human language. Wan router configuration option. Francois Romieu for writing dscc4. DCE at the Frame Relay layer: Please send corrections if you have some.