| 1 | # SPDX-License-Identifier: GPL-2.0-only |
| 2 | # |
| 3 | # PPP network device configuration |
| 4 | # |
| 5 | |
| 6 | config PPP |
| 7 | tristate "PPP (point-to-point protocol) support" |
| 8 | select SLHC |
| 9 | help |
| 10 | PPP (Point to Point Protocol) is a newer and better SLIP. It serves |
| 11 | the same purpose: sending Internet traffic over telephone (and other |
| 12 | serial) lines. Ask your access provider if they support it, because |
| 13 | otherwise you can't use it; most Internet access providers these |
| 14 | days support PPP rather than SLIP. |
| 15 | |
| 16 | To use PPP, you need an additional program called pppd, available at |
| 17 | <https://ppp.samba.org>. Make sure that you have the version of pppd |
| 18 | recommended in <file:Documentation/Changes>. |
| 19 | The PPP option enlarges your kernel by about 16 KB. |
| 20 | |
| 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. |
| 29 | |
| 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. |
| 34 | |
| 35 | if PPP |
| 36 | |
| 37 | config PPP_BSDCOMP |
| 38 | tristate "PPP BSD-Compress compression" |
| 39 | help |
| 40 | Support for the BSD-Compress compression method for PPP, which uses |
| 41 | the LZW compression method to compress each PPP packet before it is |
| 42 | sent over the wire. The machine at the other end of the PPP link |
| 43 | (usually your ISP) has to support the BSD-Compress compression |
| 44 | method as well for this to be useful. Even if they don't support it, |
| 45 | it is safe to say Y here. |
| 46 | |
| 47 | The PPP Deflate compression method ("PPP Deflate compression", |
| 48 | above) is preferable to BSD-Compress, because it compresses better |
| 49 | and is patent-free. |
| 50 | |
| 51 | Note that the BSD compression code will always be compiled as a |
| 52 | module; it is called bsd_comp and will show up in the directory |
| 53 | modules once you have said "make modules". If unsure, say N. |
| 54 | |
| 55 | config PPP_DEFLATE |
| 56 | tristate "PPP Deflate compression" |
| 57 | select ZLIB_INFLATE |
| 58 | select ZLIB_DEFLATE |
| 59 | help |
| 60 | Support for the Deflate compression method for PPP, which uses the |
| 61 | Deflate algorithm (the same algorithm that gzip uses) to compress |
| 62 | each PPP packet before it is sent over the wire. The machine at the |
| 63 | other end of the PPP link (usually your ISP) has to support the |
| 64 | Deflate compression method as well for this to be useful. Even if |
| 65 | they don't support it, it is safe to say Y here. |
| 66 | |
| 67 | To compile this driver as a module, choose M here. |
| 68 | |
| 69 | config PPP_FILTER |
| 70 | bool "PPP filtering" |
| 71 | help |
| 72 | Say Y here if you want to be able to filter the packets passing over |
| 73 | PPP interfaces. This allows you to control which packets count as |
| 74 | activity (i.e. which packets will reset the idle timer or bring up |
| 75 | a demand-dialed link) and which packets are to be dropped entirely. |
| 76 | You need to say Y here if you wish to use the pass-filter and |
| 77 | active-filter options to pppd. |
| 78 | |
| 79 | If unsure, say N. |
| 80 | |
| 81 | config PPP_MPPE |
| 82 | tristate "PPP MPPE compression (encryption)" |
| 83 | select CRYPTO_LIB_ARC4 |
| 84 | select CRYPTO_LIB_SHA1 |
| 85 | help |
| 86 | Support for the MPPE Encryption protocol, as employed by the |
| 87 | Microsoft Point-to-Point Tunneling Protocol. |
| 88 | |
| 89 | See http://pptpclient.sourceforge.net/ for information on |
| 90 | configuring PPTP clients and servers to utilize this method. |
| 91 | |
| 92 | config PPP_MULTILINK |
| 93 | bool "PPP multilink support" |
| 94 | help |
| 95 | PPP multilink is a protocol (defined in RFC 1990) which allows you |
| 96 | to combine several (logical or physical) lines into one logical PPP |
| 97 | connection, so that you can utilize your full bandwidth. |
| 98 | |
| 99 | This has to be supported at the other end as well and you need a |
| 100 | version of the pppd daemon which understands the multilink protocol. |
| 101 | |
| 102 | If unsure, say N. |
| 103 | |
| 104 | config PPPOATM |
| 105 | tristate "PPP over ATM" |
| 106 | depends on ATM |
| 107 | help |
| 108 | Support PPP (Point to Point Protocol) encapsulated in ATM frames. |
| 109 | This implementation does not yet comply with section 8 of RFC2364, |
| 110 | which can lead to bad results if the ATM peer loses state and |
| 111 | changes its encapsulation unilaterally. |
| 112 | |
| 113 | config PPPOX |
| 114 | tristate |
| 115 | |
| 116 | config PPPOE |
| 117 | tristate "PPP over Ethernet" |
| 118 | select PPPOX |
| 119 | help |
| 120 | Support for PPP over Ethernet. |
| 121 | |
| 122 | To work in client mode, pppd version 2.4.2 or later is required. |
| 123 | To work in server mode, the pppoe-server command from the RP-PPPoE |
| 124 | package is also required, available at |
| 125 | <https://dianne.skoll.ca/projects/rp-pppoe/>. |
| 126 | |
| 127 | choice |
| 128 | prompt "Number of PPPoE hash bits" |
| 129 | default PPPOE_HASH_BITS_4 |
| 130 | depends on PPPOE |
| 131 | help |
| 132 | Select the number of bits used for hashing PPPoE interfaces. |
| 133 | |
| 134 | Larger sizes reduces the risk of hash collisions at the cost |
| 135 | of slightly increased memory usage. |
| 136 | |
| 137 | This hash table is on a per outer ethernet interface. |
| 138 | |
| 139 | config PPPOE_HASH_BITS_1 |
| 140 | bool "1 bit (2 buckets)" |
| 141 | |
| 142 | config PPPOE_HASH_BITS_2 |
| 143 | bool "2 bits (4 buckets)" |
| 144 | |
| 145 | config PPPOE_HASH_BITS_4 |
| 146 | bool "4 bits (16 buckets)" |
| 147 | |
| 148 | config PPPOE_HASH_BITS_8 |
| 149 | bool "8 bits (256 buckets)" |
| 150 | |
| 151 | endchoice |
| 152 | |
| 153 | config PPPOE_HASH_BITS |
| 154 | int |
| 155 | default 1 if PPPOE_HASH_BITS_1 |
| 156 | default 2 if PPPOE_HASH_BITS_2 |
| 157 | default 4 if PPPOE_HASH_BITS_4 |
| 158 | default 8 if PPPOE_HASH_BITS_8 |
| 159 | default 4 |
| 160 | |
| 161 | config PPTP |
| 162 | tristate "PPP over IPv4 (PPTP)" |
| 163 | depends on NET_IPGRE_DEMUX |
| 164 | select PPPOX |
| 165 | help |
| 166 | Support for PPP over IPv4.(Point-to-Point Tunneling Protocol) |
| 167 | |
| 168 | This driver requires pppd plugin to work in client mode or |
| 169 | modified pptpd (poptop) to work in server mode. |
| 170 | See http://accel-pptp.sourceforge.net/ for information how to |
| 171 | utilize this module. |
| 172 | |
| 173 | config PPPOL2TP |
| 174 | tristate "PPP over L2TP" |
| 175 | depends on L2TP |
| 176 | select PPPOX |
| 177 | help |
| 178 | Support for PPP-over-L2TP socket family. L2TP is a protocol |
| 179 | used by ISPs and enterprises to tunnel PPP traffic over UDP |
| 180 | tunnels. L2TP is replacing PPTP for VPN uses. |
| 181 | if TTY |
| 182 | |
| 183 | config PPP_ASYNC |
| 184 | tristate "PPP support for async serial ports" |
| 185 | select CRC_CCITT |
| 186 | help |
| 187 | Say Y (or M) here if you want to be able to use PPP over standard |
| 188 | asynchronous serial ports, such as COM1 or COM2 on a PC. If you use |
| 189 | a modem (not a synchronous or ISDN modem) to contact your ISP, you |
| 190 | need this option. |
| 191 | |
| 192 | To compile this driver as a module, choose M here. |
| 193 | |
| 194 | If unsure, say Y. |
| 195 | |
| 196 | config PPP_SYNC_TTY |
| 197 | tristate "PPP support for sync tty ports" |
| 198 | help |
| 199 | Say Y (or M) here if you want to be able to use PPP over synchronous |
| 200 | (HDLC) tty devices. These devices are often used for high-speed leased |
| 201 | lines like T1/E1. |
| 202 | |
| 203 | To compile this driver as a module, choose M here. |
| 204 | |
| 205 | endif # TTY |
| 206 | |
| 207 | endif # PPP |