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  1 #
  2 # PPP network device configuration
  3 #
  5 config PPP
  6         tristate "PPP (point-to-point protocol) support"
  7         select SLHC
  8         ---help---
  9           PPP (Point to Point Protocol) is a newer and better SLIP.  It serves
 10           the same purpose: sending Internet traffic over telephone (and other
 11           serial) lines.  Ask your access provider if they support it, because
 12           otherwise you can't use it; most Internet access providers these
 13           days support PPP rather than SLIP.
 15           To use PPP, you need an additional program called pppd as described
 16           in the PPP-HOWTO, available at
 17           <>.  Make sure that you have
 18           the version of pppd recommended in <file:Documentation/Changes>.
 19           The PPP option enlarges your kernel by about 16 KB.
 21           There are actually two versions of PPP: the traditional PPP for
 22           asynchronous lines, such as regular analog phone lines, and
 23           synchronous PPP which can be used over digital ISDN lines for
 24           example.  If you want to use PPP over phone lines or other
 25           asynchronous serial lines, you need to say Y (or M) here and also to
 26           the next option, "PPP support for async serial ports".  For PPP over
 27           synchronous lines, you should say Y (or M) here and to "Support
 28           synchronous PPP", below.
 30           If you said Y to "Version information on all symbols" above, then
 31           you cannot compile the PPP driver into the kernel; you can then only
 32           compile it as a module. To compile this driver as a module, choose M
 33           here. The module will be called ppp_generic.
 35 if PPP
 37 config PPP_BSDCOMP
 38         tristate "PPP BSD-Compress compression"
 39         depends on PPP
 40         ---help---
 41           Support for the BSD-Compress compression method for PPP, which uses
 42           the LZW compression method to compress each PPP packet before it is
 43           sent over the wire. The machine at the other end of the PPP link
 44           (usually your ISP) has to support the BSD-Compress compression
 45           method as well for this to be useful. Even if they don't support it,
 46           it is safe to say Y here.
 48           The PPP Deflate compression method ("PPP Deflate compression",
 49           above) is preferable to BSD-Compress, because it compresses better
 50           and is patent-free.
 52           Note that the BSD compression code will always be compiled as a
 53           module; it is called bsd_comp and will show up in the directory
 54           modules once you have said "make modules". If unsure, say N.
 56 config PPP_DEFLATE
 57         tristate "PPP Deflate compression"
 58         depends on PPP
 59         select ZLIB_INFLATE
 60         select ZLIB_DEFLATE
 61         ---help---
 62           Support for the Deflate compression method for PPP, which uses the
 63           Deflate algorithm (the same algorithm that gzip uses) to compress
 64           each PPP packet before it is sent over the wire.  The machine at the
 65           other end of the PPP link (usually your ISP) has to support the
 66           Deflate compression method as well for this to be useful.  Even if
 67           they don't support it, it is safe to say Y here.
 69           To compile this driver as a module, choose M here.
 71 config PPP_FILTER
 72         bool "PPP filtering"
 73         depends on PPP
 74         ---help---
 75           Say Y here if you want to be able to filter the packets passing over
 76           PPP interfaces.  This allows you to control which packets count as
 77           activity (i.e. which packets will reset the idle timer or bring up
 78           a demand-dialed link) and which packets are to be dropped entirely.
 79           You need to say Y here if you wish to use the pass-filter and
 80           active-filter options to pppd.
 82           If unsure, say N.
 84 config PPP_MPPE
 85         tristate "PPP MPPE compression (encryption)"
 86         depends on PPP
 87         select CRYPTO
 88         select CRYPTO_SHA1
 89         select CRYPTO_ARC4
 90         select CRYPTO_ECB
 91         ---help---
 92           Support for the MPPE Encryption protocol, as employed by the
 93           Microsoft Point-to-Point Tunneling Protocol.
 95           See for information on
 96           configuring PPTP clients and servers to utilize this method.
 98 config PPP_MULTILINK
 99         bool "PPP multilink support"
100         depends on PPP
101         ---help---
102           PPP multilink is a protocol (defined in RFC 1990) which allows you
103           to combine several (logical or physical) lines into one logical PPP
104           connection, so that you can utilize your full bandwidth.
106           This has to be supported at the other end as well and you need a
107           version of the pppd daemon which understands the multilink protocol.
109           If unsure, say N.
111 config PPPOATM
112         tristate "PPP over ATM"
113         depends on ATM && PPP
114         ---help---
115           Support PPP (Point to Point Protocol) encapsulated in ATM frames.
116           This implementation does not yet comply with section 8 of RFC2364,
117           which can lead to bad results if the ATM peer loses state and
118           changes its encapsulation unilaterally.
120 config PPPOE
121         tristate "PPP over Ethernet"
122         depends on PPP
123         ---help---
124           Support for PPP over Ethernet.
126           This driver requires the latest version of pppd from the CVS
127           repository at  Alternatively, see the
128           RoaringPenguin package (<>)
129           which contains instruction on how to use this driver (under
130           the heading "Kernel mode PPPoE").
132 config PPTP
133         tristate "PPP over IPv4 (PPTP)"
134         depends on PPP && NET_IPGRE_DEMUX
135         ---help---
136           Support for PPP over IPv4.(Point-to-Point Tunneling Protocol)
138           This driver requires pppd plugin to work in client mode or
139           modified pptpd (poptop) to work in server mode.
140           See for information how to
141           utilize this module.
143 config PPPOL2TP
144         tristate "PPP over L2TP"
145         depends on L2TP && PPP
146         ---help---
147           Support for PPP-over-L2TP socket family. L2TP is a protocol
148           used by ISPs and enterprises to tunnel PPP traffic over UDP
149           tunnels. L2TP is replacing PPTP for VPN uses.
150 if TTY
152 config PPP_ASYNC
153         tristate "PPP support for async serial ports"
154         depends on PPP
155         select CRC_CCITT
156         ---help---
157           Say Y (or M) here if you want to be able to use PPP over standard
158           asynchronous serial ports, such as COM1 or COM2 on a PC.  If you use
159           a modem (not a synchronous or ISDN modem) to contact your ISP, you
160           need this option.
162           To compile this driver as a module, choose M here.
164           If unsure, say Y.
166 config PPP_SYNC_TTY
167         tristate "PPP support for sync tty ports"
168         depends on PPP
169         ---help---
170           Say Y (or M) here if you want to be able to use PPP over synchronous
171           (HDLC) tty devices, such as the SyncLink adapter. These devices
172           are often used for high-speed leased lines like T1/E1.
174           To compile this driver as a module, choose M here.
176 endif # TTY
178 endif # PPP

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