| # SPDX-License-Identifier: GPL-2.0-only |
| # |
| # PPP network device configuration |
| # |
| |
| config PPP |
| tristate "PPP (point-to-point protocol) support" |
| select SLHC |
| help |
| PPP (Point to Point Protocol) is a newer and better SLIP. It serves |
| the same purpose: sending Internet traffic over telephone (and other |
| serial) lines. Ask your access provider if they support it, because |
| otherwise you can't use it; most Internet access providers these |
| days support PPP rather than SLIP. |
| |
| To use PPP, you need an additional program called pppd as described |
| in the PPP-HOWTO, available at |
| <http://www.tldp.org/docs.html#howto>. Make sure that you have |
| the version of pppd recommended in <file:Documentation/Changes>. |
| The PPP option enlarges your kernel by about 16 KB. |
| |
| There are actually two versions of PPP: the traditional PPP for |
| asynchronous lines, such as regular analog phone lines, and |
| synchronous PPP which can be used over digital ISDN lines for |
| example. If you want to use PPP over phone lines or other |
| asynchronous serial lines, you need to say Y (or M) here and also to |
| the next option, "PPP support for async serial ports". For PPP over |
| synchronous lines, you should say Y (or M) here and to "Support |
| synchronous PPP", below. |
| |
| If you said Y to "Version information on all symbols" above, then |
| you cannot compile the PPP driver into the kernel; you can then only |
| compile it as a module. To compile this driver as a module, choose M |
| here. The module will be called ppp_generic. |
| |
| if PPP |
| |
| config PPP_BSDCOMP |
| tristate "PPP BSD-Compress compression" |
| depends on PPP |
| help |
| Support for the BSD-Compress compression method for PPP, which uses |
| the LZW compression method to compress each PPP packet before it is |
| sent over the wire. The machine at the other end of the PPP link |
| (usually your ISP) has to support the BSD-Compress compression |
| method as well for this to be useful. Even if they don't support it, |
| it is safe to say Y here. |
| |
| The PPP Deflate compression method ("PPP Deflate compression", |
| above) is preferable to BSD-Compress, because it compresses better |
| and is patent-free. |
| |
| Note that the BSD compression code will always be compiled as a |
| module; it is called bsd_comp and will show up in the directory |
| modules once you have said "make modules". If unsure, say N. |
| |
| config PPP_DEFLATE |
| tristate "PPP Deflate compression" |
| depends on PPP |
| select ZLIB_INFLATE |
| select ZLIB_DEFLATE |
| help |
| Support for the Deflate compression method for PPP, which uses the |
| Deflate algorithm (the same algorithm that gzip uses) to compress |
| each PPP packet before it is sent over the wire. The machine at the |
| other end of the PPP link (usually your ISP) has to support the |
| Deflate compression method as well for this to be useful. Even if |
| they don't support it, it is safe to say Y here. |
| |
| To compile this driver as a module, choose M here. |
| |
| config PPP_FILTER |
| bool "PPP filtering" |
| depends on PPP |
| help |
| Say Y here if you want to be able to filter the packets passing over |
| PPP interfaces. This allows you to control which packets count as |
| activity (i.e. which packets will reset the idle timer or bring up |
| a demand-dialed link) and which packets are to be dropped entirely. |
| You need to say Y here if you wish to use the pass-filter and |
| active-filter options to pppd. |
| |
| If unsure, say N. |
| |
| config PPP_MPPE |
| tristate "PPP MPPE compression (encryption)" |
| depends on PPP |
| select CRYPTO |
| select CRYPTO_SHA1 |
| select CRYPTO_LIB_ARC4 |
| help |
| Support for the MPPE Encryption protocol, as employed by the |
| Microsoft Point-to-Point Tunneling Protocol. |
| |
| See http://pptpclient.sourceforge.net/ for information on |
| configuring PPTP clients and servers to utilize this method. |
| |
| config PPP_MULTILINK |
| bool "PPP multilink support" |
| depends on PPP |
| help |
| PPP multilink is a protocol (defined in RFC 1990) which allows you |
| to combine several (logical or physical) lines into one logical PPP |
| connection, so that you can utilize your full bandwidth. |
| |
| This has to be supported at the other end as well and you need a |
| version of the pppd daemon which understands the multilink protocol. |
| |
| If unsure, say N. |
| |
| config PPPOATM |
| tristate "PPP over ATM" |
| depends on ATM && PPP |
| help |
| Support PPP (Point to Point Protocol) encapsulated in ATM frames. |
| This implementation does not yet comply with section 8 of RFC2364, |
| which can lead to bad results if the ATM peer loses state and |
| changes its encapsulation unilaterally. |
| |
| config PPPOE |
| tristate "PPP over Ethernet" |
| depends on PPP |
| help |
| Support for PPP over Ethernet. |
| |
| This driver requires the latest version of pppd from the CVS |
| repository at cvs.samba.org. Alternatively, see the |
| RoaringPenguin package (<http://www.roaringpenguin.com/pppoe>) |
| which contains instruction on how to use this driver (under |
| the heading "Kernel mode PPPoE"). |
| |
| config PPTP |
| tristate "PPP over IPv4 (PPTP)" |
| depends on PPP && NET_IPGRE_DEMUX |
| help |
| Support for PPP over IPv4.(Point-to-Point Tunneling Protocol) |
| |
| This driver requires pppd plugin to work in client mode or |
| modified pptpd (poptop) to work in server mode. |
| See http://accel-pptp.sourceforge.net/ for information how to |
| utilize this module. |
| |
| config PPPOL2TP |
| tristate "PPP over L2TP" |
| depends on L2TP && PPP |
| help |
| Support for PPP-over-L2TP socket family. L2TP is a protocol |
| used by ISPs and enterprises to tunnel PPP traffic over UDP |
| tunnels. L2TP is replacing PPTP for VPN uses. |
| if TTY |
| |
| config PPP_ASYNC |
| tristate "PPP support for async serial ports" |
| depends on PPP |
| select CRC_CCITT |
| help |
| Say Y (or M) here if you want to be able to use PPP over standard |
| asynchronous serial ports, such as COM1 or COM2 on a PC. If you use |
| a modem (not a synchronous or ISDN modem) to contact your ISP, you |
| need this option. |
| |
| To compile this driver as a module, choose M here. |
| |
| If unsure, say Y. |
| |
| config PPP_SYNC_TTY |
| tristate "PPP support for sync tty ports" |
| depends on PPP |
| help |
| Say Y (or M) here if you want to be able to use PPP over synchronous |
| (HDLC) tty devices, such as the SyncLink adapter. These devices |
| are often used for high-speed leased lines like T1/E1. |
| |
| To compile this driver as a module, choose M here. |
| |
| endif # TTY |
| |
| endif # PPP |
