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authorTobias Klauser <tklauser@nuerscht.ch>2005-06-25 14:59:30 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 16:25:09 -0700
commitf353488ce48e7a0311fe764284096481b455fbe9 (patch)
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[PATCH] Remove duplicate file in Documentation/networking
The files wanpipe.txt and wan-router.txt in Documentation/networking contain the exact same information (diff between the two shows no document is "Linux WAN Router Utilities Package" and therefor the name wan-router.txt is more appropriate. Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch> Signed-off-by: Domen Puncer <domen@coderock.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/networking/wanpipe.txt622
1 files changed, 0 insertions, 622 deletions
diff --git a/Documentation/networking/wanpipe.txt b/Documentation/networking/wanpipe.txt
deleted file mode 100644
index aea20cd2a56..00000000000
--- a/Documentation/networking/wanpipe.txt
+++ /dev/null
@@ -1,622 +0,0 @@
-------------------------------------------------------------------------------
-Linux WAN Router Utilities Package
-------------------------------------------------------------------------------
-Version 2.2.1
-Mar 28, 2001
-Author: Nenad Corbic <ncorbic@sangoma.com>
-Copyright (c) 1995-2001 Sangoma Technologies Inc.
-------------------------------------------------------------------------------
-
-INTRODUCTION
-
-Wide Area Networks (WANs) are used to interconnect Local Area Networks (LANs)
-and/or stand-alone hosts over vast distances with data transfer rates
-significantly higher than those achievable with commonly used dial-up
-connections.
-
-Usually an external device called `WAN router' sitting on your local network
-or connected to your machine's serial port provides physical connection to
-WAN. Although router's job may be as simple as taking your local network
-traffic, converting it to WAN format and piping it through the WAN link, these
-devices are notoriously expensive, with prices as much as 2 - 5 times higher
-then the price of a typical PC box.
-
-Alternatively, considering robustness and multitasking capabilities of Linux,
-an internal router can be built (most routers use some sort of stripped down
-Unix-like operating system anyway). With a number of relatively inexpensive WAN
-interface cards available on the market, a perfectly usable router can be
-built for less than half a price of an external router. Yet a Linux box
-acting as a router can still be used for other purposes, such as fire-walling,
-running FTP, WWW or DNS server, etc.
-
-This kernel module introduces the notion of a WAN Link Driver (WLD) to Linux
-operating system and provides generic hardware-independent services for such
-drivers. Why can existing Linux network device interface not be used for
-this purpose? Well, it can. However, there are a few key differences between
-a typical network interface (e.g. Ethernet) and a WAN link.
-
-Many WAN protocols, such as X.25 and frame relay, allow for multiple logical
-connections (known as `virtual circuits' in X.25 terminology) over a single
-physical link. Each such virtual circuit may (and almost always does) lead
-to a different geographical location and, therefore, different network. As a
-result, it is the virtual circuit, not the physical link, that represents a
-route and, therefore, a network interface in Linux terms.
-
-To further complicate things, virtual circuits are usually volatile in nature
-(excluding so called `permanent' virtual circuits or PVCs). With almost no
-time required to set up and tear down a virtual circuit, it is highly desirable
-to implement on-demand connections in order to minimize network charges. So
-unlike a typical network driver, the WAN driver must be able to handle multiple
-network interfaces and cope as multiple virtual circuits come into existence
-and go away dynamically.
-
-Last, but not least, WAN configuration is much more complex than that of say
-Ethernet and may well amount to several dozens of parameters. Some of them
-are "link-wide" while others are virtual circuit-specific. The same holds
-true for WAN statistics which is by far more extensive and extremely useful
-when troubleshooting WAN connections. Extending the ifconfig utility to suit
-these needs may be possible, but does not seem quite reasonable. Therefore, a
-WAN configuration utility and corresponding application programmer's interface
-is needed for this purpose.
-
-Most of these problems are taken care of by this module. Its goal is to
-provide a user with more-or-less standard look and feel for all WAN devices and
-assist a WAN device driver writer by providing common services, such as:
-
- o User-level interface via /proc file system
- o Centralized configuration
- o Device management (setup, shutdown, etc.)
- o Network interface management (dynamic creation/destruction)
- o Protocol encapsulation/decapsulation
-
-To ba able to use the Linux WAN Router you will also need a WAN Tools package
-available from
-
- ftp.sangoma.com/pub/linux/current_wanpipe/wanpipe-X.Y.Z.tgz
-
-where vX.Y.Z represent the wanpipe version number.
-
-For technical questions and/or comments please e-mail to ncorbic@sangoma.com.
-For general inquiries please contact Sangoma Technologies Inc. by
-
- Hotline: 1-800-388-2475 (USA and Canada, toll free)
- Phone: (905) 474-1990 ext: 106
- Fax: (905) 474-9223
- E-mail: dm@sangoma.com (David Mandelstam)
- WWW: http://www.sangoma.com
-
-
-INSTALLATION
-
-Please read the WanpipeForLinux.pdf manual on how to
-install the WANPIPE tools and drivers properly.
-
-
-After installing wanpipe package: /usr/local/wanrouter/doc.
-On the ftp.sangoma.com : /linux/current_wanpipe/doc
-
-
-COPYRIGHT AND LICENSING INFORMATION
-
-This program is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free Software
-Foundation; either version 2, or (at your option) any later version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT
-ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License along with
-this program; if not, write to the Free Software Foundation, Inc., 675 Mass
-Ave, Cambridge, MA 02139, USA.
-
-
-
-ACKNOWLEDGEMENTS
-
-This product is based on the WANPIPE(tm) Multiprotocol WAN Router developed
-by Sangoma Technologies Inc. for Linux 2.0.x and 2.2.x. Success of the WANPIPE
-together with the next major release of Linux kernel in summer 1996 commanded
-adequate changes to the WANPIPE code to take full advantage of new Linux
-features.
-
-Instead of continuing developing proprietary interface tied to Sangoma WAN
-cards, we decided to separate all hardware-independent code into a separate
-module and defined two levels of interfaces - one for user-level applications
-and another for kernel-level WAN drivers. WANPIPE is now implemented as a
-WAN driver compliant with the WAN Link Driver interface. Also a general
-purpose WAN configuration utility and a set of shell scripts was developed to
-support WAN router at the user level.
-
-Many useful ideas concerning hardware-independent interface implementation
-were given by Mike McLagan <mike.mclagan@linux.org> and his implementation
-of the Frame Relay router and drivers for Sangoma cards (dlci/sdla).
-
-With the new implementation of the APIs being incorporated into the WANPIPE,
-a special thank goes to Alan Cox in providing insight into BSD sockets.
-
-Special thanks to all the WANPIPE users who performed field-testing, reported
-bugs and made valuable comments and suggestions that help us to improve this
-product.
-
-
-
-NEW IN THIS RELEASE
-
- o Updated the WANCFG utility
- Calls the pppconfig to configure the PPPD
- for async connections.
-
- o Added the PPPCONFIG utility
- Used to configure the PPPD dameon for the
- WANPIPE Async PPP and standard serial port.
- The wancfg calls the pppconfig to configure
- the pppd.
-
- o Fixed the PCI autodetect feature.
- The SLOT 0 was used as an autodetect option
- however, some high end PC's slot numbers start
- from 0.
-
- o This release has been tested with the new backupd
- daemon release.
-
-
-PRODUCT COMPONENTS AND RELATED FILES
-
-/etc: (or user defined)
- wanpipe1.conf default router configuration file
-
-/lib/modules/X.Y.Z/misc:
- wanrouter.o router kernel loadable module
- af_wanpipe.o wanpipe api socket module
-
-/lib/modules/X.Y.Z/net:
- sdladrv.o Sangoma SDLA support module
- wanpipe.o Sangoma WANPIPE(tm) driver module
-
-/proc/net/wanrouter
- Config reads current router configuration
- Status reads current router status
- {name} reads WAN driver statistics
-
-/usr/sbin:
- wanrouter wanrouter start-up script
- wanconfig wanrouter configuration utility
- sdladump WANPIPE adapter memory dump utility
- fpipemon Monitor for Frame Relay
- cpipemon Monitor for Cisco HDLC
- ppipemon Monitor for PPP
- xpipemon Monitor for X25
- wpkbdmon WANPIPE keyboard led monitor/debugger
-
-/usr/local/wanrouter:
- README this file
- COPYING GNU General Public License
- Setup installation script
- Filelist distribution definition file
- wanrouter.rc meta-configuration file
- (used by the Setup and wanrouter script)
-
-/usr/local/wanrouter/doc:
- wanpipeForLinux.pdf WAN Router User's Manual
-
-/usr/local/wanrouter/patches:
- wanrouter-v2213.gz patch for Linux kernels 2.2.11 up to 2.2.13.
- wanrouter-v2214.gz patch for Linux kernel 2.2.14.
- wanrouter-v2215.gz patch for Linux kernels 2.2.15 to 2.2.17.
- wanrouter-v2218.gz patch for Linux kernels 2.2.18 and up.
- wanrouter-v240.gz patch for Linux kernel 2.4.0.
- wanrouter-v242.gz patch for Linux kernel 2.4.2 and up.
- wanrouter-v2034.gz patch for Linux kernel 2.0.34
- wanrouter-v2036.gz patch for Linux kernel 2.0.36 and up.
-
-/usr/local/wanrouter/patches/kdrivers:
- Sources of the latest WANPIPE device drivers.
- These are used to UPGRADE the linux kernel to the newest
- version if the kernel source has already been pathced with
- WANPIPE drivers.
-
-/usr/local/wanrouter/samples:
- interface sample interface configuration file
- wanpipe1.cpri CHDLC primary port
- wanpipe2.csec CHDLC secondary port
- wanpipe1.fr Frame Relay protocol
- wanpipe1.ppp PPP protocol )
- wanpipe1.asy CHDLC ASYNC protocol
- wanpipe1.x25 X25 protocol
- wanpipe1.stty Sync TTY driver (Used by Kernel PPPD daemon)
- wanpipe1.atty Async TTY driver (Used by Kernel PPPD daemon)
- wanrouter.rc sample meta-configuration file
-
-/usr/local/wanrouter/util:
- * wan-tools utilities source code
-
-/usr/local/wanrouter/api/x25:
- * x25 api sample programs.
-/usr/local/wanrouter/api/chdlc:
- * chdlc api sample programs.
-/usr/local/wanrouter/api/fr:
- * fr api sample programs.
-/usr/local/wanrouter/config/wancfg:
- wancfg WANPIPE GUI configuration program.
- Creates wanpipe#.conf files.
-/usr/local/wanrouter/config/cfgft1:
- cfgft1 GUI CSU/DSU configuration program.
-
-/usr/include/linux:
- wanrouter.h router API definitions
- wanpipe.h WANPIPE API definitions
- sdladrv.h SDLA support module API definitions
- sdlasfm.h SDLA firmware module definitions
- if_wanpipe.h WANPIPE Socket definitions
- if_wanpipe_common.h WANPIPE Socket/Driver common definitions.
- sdlapci.h WANPIPE PCI definitions
-
-
-/usr/src/linux/net/wanrouter:
- * wanrouter source code
-
-/var/log:
- wanrouter wanrouter start-up log (created by the Setup script)
-
-/var/lock: (or /var/lock/subsys for RedHat)
- wanrouter wanrouter lock file (created by the Setup script)
-
-/usr/local/wanrouter/firmware:
- fr514.sfm Frame relay firmware for Sangoma S508/S514 card
- cdual514.sfm Dual Port Cisco HDLC firmware for Sangoma S508/S514 card
- ppp514.sfm PPP Firmware for Sangoma S508 and S514 cards
- x25_508.sfm X25 Firmware for Sangoma S508 card.
-
-
-REVISION HISTORY
-
-1.0.0 December 31, 1996 Initial version
-
-1.0.1 January 30, 1997 Status and statistics can be read via /proc
- filesystem entries.
-
-1.0.2 April 30, 1997 Added UDP management via monitors.
-
-1.0.3 June 3, 1997 UDP management for multiple boards using Frame
- Relay and PPP
- Enabled continuous transmission of Configure
- Request Packet for PPP (for 508 only)
- Connection Timeout for PPP changed from 900 to 0
- Flow Control Problem fixed for Frame Relay
-
-1.0.4 July 10, 1997 S508/FT1 monitoring capability in fpipemon and
- ppipemon utilities.
- Configurable TTL for UDP packets.
- Multicast and Broadcast IP source addresses are
- silently discarded.
-
-1.0.5 July 28, 1997 Configurable T391,T392,N391,N392,N393 for Frame
- Relay in router.conf.
- Configurable Memory Address through router.conf
- for Frame Relay, PPP and X.25. (commenting this
- out enables auto-detection).
- Fixed freeing up received buffers using kfree()
- for Frame Relay and X.25.
- Protect sdla_peek() by calling save_flags(),
- cli() and restore_flags().
- Changed number of Trace elements from 32 to 20
- Added DLCI specific data monitoring in FPIPEMON.
-2.0.0 Nov 07, 1997 Implemented protection of RACE conditions by
- critical flags for FRAME RELAY and PPP.
- DLCI List interrupt mode implemented.
- IPX support in FRAME RELAY and PPP.
- IPX Server Support (MARS)
- More driver specific stats included in FPIPEMON
- and PIPEMON.
-
-2.0.1 Nov 28, 1997 Bug Fixes for version 2.0.0.
- Protection of "enable_irq()" while
- "disable_irq()" has been enabled from any other
- routine (for Frame Relay, PPP and X25).
- Added additional Stats for Fpipemon and Ppipemon
- Improved Load Sharing for multiple boards
-
-2.0.2 Dec 09, 1997 Support for PAP and CHAP for ppp has been
- implemented.
-
-2.0.3 Aug 15, 1998 New release supporting Cisco HDLC, CIR for Frame
- relay, Dynamic IP assignment for PPP and Inverse
- Arp support for Frame-relay. Man Pages are
- included for better support and a new utility
- for configuring FT1 cards.
-
-2.0.4 Dec 09, 1998 Dual Port support for Cisco HDLC.
- Support for HDLC (LAPB) API.
- Supports BiSync Streaming code for S502E
- and S503 cards.
- Support for Streaming HDLC API.
- Provides a BSD socket interface for
- creating applications using BiSync
- streaming.
-
-2.0.5 Aug 04, 1999 CHDLC initializatin bug fix.
- PPP interrupt driven driver:
- Fix to the PPP line hangup problem.
- New PPP firmware
- Added comments to the startup SYSTEM ERROR messages
- Xpipemon debugging application for the X25 protocol
- New USER_MANUAL.txt
- Fixed the odd boundary 4byte writes to the board.
- BiSync Streaming code has been taken out.
- Available as a patch.
- Streaming HDLC API has been taken out.
- Available as a patch.
-
-2.0.6 Aug 17, 1999 Increased debugging in statup scripts
- Fixed insallation bugs from 2.0.5
- Kernel patch works for both 2.2.10 and 2.2.11 kernels.
- There is no functional difference between the two packages
-
-2.0.7 Aug 26, 1999 o Merged X25API code into WANPIPE.
- o Fixed a memeory leak for X25API
- o Updated the X25API code for 2.2.X kernels.
- o Improved NEM handling.
-
-2.1.0 Oct 25, 1999 o New code for S514 PCI Card
- o New CHDLC and Frame Relay drivers
- o PPP and X25 are not supported in this release
-
-2.1.1 Nov 30, 1999 o PPP support for S514 PCI Cards
-
-2.1.3 Apr 06, 2000 o Socket based x25api
- o Socket based chdlc api
- o Socket based fr api
- o Dual Port Receive only CHDLC support.
- o Asynchronous CHDLC support (Secondary Port)
- o cfgft1 GUI csu/dsu configurator
- o wancfg GUI configuration file
- configurator.
- o Architectual directory changes.
-
-beta-2.1.4 Jul 2000 o Dynamic interface configuration:
- Network interfaces reflect the state
- of protocol layer. If the protocol becomes
- disconnected, driver will bring down
- the interface. Once the protocol reconnects
- the interface will be brought up.
-
- Note: This option is turned off by default.
-
- o Dynamic wanrouter setup using 'wanconfig':
- wanconfig utility can be used to
- shutdown,restart,start or reconfigure
- a virtual circuit dynamically.
-
- Frame Relay: Each DLCI can be:
- created,stopped,restarted and reconfigured
- dynamically using wanconfig.
-
- ex: wanconfig card wanpipe1 dev wp1_fr16 up
-
- o Wanrouter startup via command line arguments:
- wanconfig also supports wanrouter startup via command line
- arguments. Thus, there is no need to create a wanpipe#.conf
- configuration file.
-
- o Socket based x25api update/bug fixes.
- Added support for LCN numbers greater than 255.
- Option to pass up modem messages.
- Provided a PCI IRQ check, so a single S514
- card is guaranteed to have a non-sharing interrupt.
-
- o Fixes to the wancfg utility.
- o New FT1 debugging support via *pipemon utilities.
- o Frame Relay ARP support Enabled.
-
-beta3-2.1.4 Jul 2000 o X25 M_BIT Problem fix.
- o Added the Multi-Port PPP
- Updated utilites for the Multi-Port PPP.
-
-2.1.4 Aut 2000
- o In X25API:
- Maximum packet an application can send
- to the driver has been extended to 4096 bytes.
-
- Fixed the x25 startup bug. Enable
- communications only after all interfaces
- come up. HIGH SVC/PVC is used to calculate
- the number of channels.
- Enable protocol only after all interfaces
- are enabled.
-
- o Added an extra state to the FT1 config, kernel module.
- o Updated the pipemon debuggers.
-
- o Blocked the Multi-Port PPP from running on kernels
- 2.2.16 or greater, due to syncppp kernel module
- change.
-
-beta1-2.1.5 Nov 15 2000
- o Fixed the MulitPort PPP Support for kernels 2.2.16 and above.
- 2.2.X kernels only
-
- o Secured the driver UDP debugging calls
- - All illegal netowrk debugging calls are reported to
- the log.
- - Defined a set of allowed commands, all other denied.
-
- o Cpipemon
- - Added set FT1 commands to the cpipemon. Thus CSU/DSU
- configuraiton can be performed using cpipemon.
- All systems that cannot run cfgft1 GUI utility should
- use cpipemon to configure the on board CSU/DSU.
-
-
- o Keyboard Led Monitor/Debugger
- - A new utilty /usr/sbin/wpkbdmon uses keyboard leds
- to convey operatinal statistic information of the
- Sangoma WANPIPE cards.
- NUM_LOCK = Line State (On=connected, Off=disconnected)
- CAPS_LOCK = Tx data (On=transmitting, Off=no tx data)
- SCROLL_LOCK = Rx data (On=receiving, Off=no rx data
-
- o Hardware probe on module load and dynamic device allocation
- - During WANPIPE module load, all Sangoma cards are probed
- and found information is printed in the /var/log/messages.
- - If no cards are found, the module load fails.
- - Appropriate number of devices are dynamically loaded
- based on the number of Sangoma cards found.
-
- Note: The kernel configuraiton option
- CONFIG_WANPIPE_CARDS has been taken out.
-
- o Fixed the Frame Relay and Chdlc network interfaces so they are
- compatible with libpcap libraries. Meaning, tcpdump, snort,
- ethereal, and all other packet sniffers and debuggers work on
- all WANPIPE netowrk interfaces.
- - Set the network interface encoding type to ARPHRD_PPP.
- This tell the sniffers that data obtained from the
- network interface is in pure IP format.
- Fix for 2.2.X kernels only.
-
- o True interface encoding option for Frame Relay and CHDLC
- - The above fix sets the network interface encoding
- type to ARPHRD_PPP, however some customers use
- the encoding interface type to determine the
- protocol running. Therefore, the TURE ENCODING
- option will set the interface type back to the
- original value.
-
- NOTE: If this option is used with Frame Relay and CHDLC
- libpcap library support will be broken.
- i.e. tcpdump will not work.
- Fix for 2.2.x Kernels only.
-
- o Ethernet Bridgind over Frame Relay
- - The Frame Relay bridging has been developed by
- Kristian Hoffmann and Mark Wells.
- - The Linux kernel bridge is used to send ethernet
- data over the frame relay links.
- For 2.2.X Kernels only.
-
- o Added extensive 2.0.X support. Most new features of
- 2.1.5 for protocols Frame Relay, PPP and CHDLC are
- supported under 2.0.X kernels.
-
-beta1-2.2.0 Dec 30 2000
- o Updated drivers for 2.4.X kernels.
- o Updated drivers for SMP support.
- o X25API is now able to share PCI interrupts.
- o Took out a general polling routine that was used
- only by X25API.
- o Added appropriate locks to the dynamic reconfiguration
- code.
- o Fixed a bug in the keyboard debug monitor.
-
-beta2-2.2.0 Jan 8 2001
- o Patches for 2.4.0 kernel
- o Patches for 2.2.18 kernel
- o Minor updates to PPP and CHLDC drivers.
- Note: No functinal difference.
-
-beta3-2.2.9 Jan 10 2001
- o I missed the 2.2.18 kernel patches in beta2-2.2.0
- release. They are included in this release.
-
-Stable Release
-2.2.0 Feb 01 2001
- o Bug fix in wancfg GUI configurator.
- The edit function didn't work properly.
-
-
-bata1-2.2.1 Feb 09 2001
- o WANPIPE TTY Driver emulation.
- Two modes of operation Sync and Async.
- Sync: Using the PPPD daemon, kernel SyncPPP layer
- and the Wanpipe sync TTY driver: a PPP protocol
- connection can be established via Sangoma adapter, over
- a T1 leased line.
-
- The 2.4.0 kernel PPP layer supports MULTILINK
- protocol, that can be used to bundle any number of Sangoma
- adapters (T1 lines) into one, under a single IP address.
- Thus, efficiently obtaining multiple T1 throughput.
-
- NOTE: The remote side must also implement MULTILINK PPP
- protocol.
-
- Async:Using the PPPD daemon, kernel AsyncPPP layer
- and the WANPIPE async TTY driver: a PPP protocol
- connection can be established via Sangoma adapter and
- a modem, over a telephone line.
-
- Thus, the WANPIPE async TTY driver simulates a serial
- TTY driver that would normally be used to interface the
- MODEM to the linux kernel.
-
- o WANPIPE PPP Backup Utility
- This utility will monitor the state of the PPP T1 line.
- In case of failure, a dial up connection will be established
- via pppd daemon, ether via a serial tty driver (serial port),
- or a WANPIPE async TTY driver (in case serial port is unavailable).
-
- Furthermore, while in dial up mode, the primary PPP T1 link
- will be monitored for signs of life.
-
- If the PPP T1 link comes back to life, the dial up connection
- will be shutdown and T1 line re-established.
-
-
- o New Setup installation script.
- Option to UPGRADE device drivers if the kernel source has
- already been patched with WANPIPE.
-
- Option to COMPILE WANPIPE modules against the currently
- running kernel, thus no need for manual kernel and module
- re-compilatin.
-
- o Updates and Bug Fixes to wancfg utility.
-
-bata2-2.2.1 Feb 20 2001
-
- o Bug fixes to the CHDLC device drivers.
- The driver had compilation problems under kernels
- 2.2.14 or lower.
-
- o Bug fixes to the Setup installation script.
- The device drivers compilation options didn't work
- properly.
-
- o Update to the wpbackupd daemon.
- Optimized the cross-over times, between the primary
- link and the backup dialup.
-
-beta3-2.2.1 Mar 02 2001
- o Patches for 2.4.2 kernel.
-
- o Bug fixes to util/ make files.
- o Bug fixes to the Setup installation script.
-
- o Took out the backupd support and made it into
- as separate package.
-
-beta4-2.2.1 Mar 12 2001
-
- o Fix to the Frame Relay Device driver.
- IPSAC sends a packet of zero length
- header to the frame relay driver. The
- driver tries to push its own 2 byte header
- into the packet, which causes the driver to
- crash.
-
- o Fix the WANPIPE re-configuration code.
- Bug was found by trying to run the cfgft1 while the
- interface was already running.
-
- o Updates to cfgft1.
- Writes a wanpipe#.cfgft1 configuration file
- once the CSU/DSU is configured. This file can
- holds the current CSU/DSU configuration.
-
-
-
->>>>>> END OF README <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
-
-