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