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linux-headers-5.15.0-181
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net
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# 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
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