.\" Copyright (C) 1997 by Joerg Wunsch, Dresden .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS .\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED .\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE .\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, .\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES .\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR .\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING .\" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE .\" POSSIBILITY OF SUCH DAMAGE. .\" .\" $FreeBSD: src/sbin/spppcontrol/spppcontrol.8,v 1.6.2.6 2003/02/23 22:12:39 trhodes Exp $ .\" .Dd December 30, 2001 .Dt SPPPCONTROL 8 .Os .Sh NAME .Nm spppcontrol .Nd display or set parameters for an sppp interface .Sh SYNOPSIS .Nm .Op Fl v .Ar ifname .Op Ar parameter Ns Op Li = Ns Ar value .Op Ar ... .Sh DESCRIPTION The .Xr sppp 4 driver might require a number of additional arguments or optional parameters besides the settings that can be adjusted with .Xr ifconfig 8 . These are things like authentication protocol parameters, but also other tunable configuration variables. The .Nm utility can be used to display the current settings, or adjust these parameters as required. .Pp For whatever intent .Nm is being called, at least the parameter .Ar ifname needs to be specified, naming the interface for which the settings are to be performed or displayed. Use .Xr ifconfig 8 , or .Xr netstat 1 to see which interfaces are available. .Pp If no other parameter is given, .Nm will just list the current settings for .Ar ifname and exit. The reported settings include the current PPP phase the interface is in, which can be one of the names .Em dead , .Em establish , .Em authenticate , .Em network , or .Em terminate . If an authentication protocol is configured for the interface, the name of the protocol to be used, as well as the system name to be used or expected will be displayed, plus any possible options to the authentication protocol if applicable. Note that the authentication secrets (sometimes also called .Em keys ) are not being returned by the underlying system call, and are thus not displayed. .Pp If any additional parameter is supplied, superuser privileges are required, and the command works in the .Dq set mode. This is normally done quietly, unless the option .Fl v is also enabled, which will cause a final printout of the settings as described above once all other actions have been taken. Use of this mode will be rejected if the interface is currently in any other phase than .Em dead . Note that you can force an interface into .Em dead phase by calling .Xr ifconfig 8 with the parameter .Cm down . .Pp The currently supported parameters include: .Bl -tag -offset indent -width indent .It Va authproto Ns Li = Ns Ar protoname Set both, his and my authentication protocol to .Ar protoname . The protocol name can be one of .Dq Li chap , .Dq Li pap , or .Dq Li none . In the latter case, the use of an authentication protocol will be turned off for the named interface. This has the side-effect of clearing the other authentication-related parameters for this interface as well (i.e. system name and authentication secret will be forgotten). .It Va myauthproto Ns Li = Ns Ar protoname Same as above, but only for my end of the link. I.e. this is the protocol when remote is authenticator, and I am the peer required to authenticate. .It Va hisauthproto Ns Li = Ns Ar protoname Same as above, but only for his end of the link. .It Va myauthname Ns Li = Ns Ar name Set my system name for the authentication protocol. .It Va hisauthname Ns Li = Ns Ar name Set his system name for the authentication protocol. For CHAP, this will only be used as a hint, causing a warning message if remote did supply a different name. For PAP, it's the name remote must use to authenticate himself (in connection with his secret). .It Va myauthsecret Ns Li = Ns Ar secret Set my secret (key, password) for use in the authentication phase. For CHAP, this will be used to compute the response hash value, based on remote's challenge. For PAP, it will be transmitted as plain text together with the system name. Don't forget to quote the secrets from the shell if they contain shell metacharacters (or white space). .It Va myauthkey Ns Li = Ns Ar secret Same as above. .It Va hisauthsecret Ns Li = Ns Ar secret Same as above, to be used if we are an authenticator and the remote peer needs to authenticate. .It Va hisauthkey Ns Li = Ns Va secret Same as above. .It Va callin Require remote to authenticate himself only when he's calling in, but not when we are caller. This is required for some peers that do not implement the authentication protocols symmetrically (like Ascend routers, for example). .It Va always The opposite of .Va callin . Require remote to always authenticate, regardless of which side is placing the call. This is the default, and will not be explicitly displayed in the .Dq list mode. .It Va norechallenge Only meaningful with CHAP. Do not re-challenge peer once the initial CHAP handshake was successful. Used to work around broken peer implementations that can't grok being re-challenged once the connection is up. .It Ar rechallenge With CHAP, send re-challenges at random intervals while the connection is in network phase. (The intervals are currently in the range of 300 through approximately 800 seconds.) This is the default, and will not be explicitly displayed in the .Dq list mode. .It Va lcp-timeout Ns Li = Ns Ar timeout-value Allows to change the value of the LCP restart timer. Values are specified in milliseconds. The value must be between 10 and 20000 ms, defaulting to 3000 ms. .It Va enable-vj Enable negotiation of Van Jacobsen header compression. (Enabled by default.) .It Va disable-vj Disable negotiation of Van Jacobsen header compression. .It Va enable-ipv6 Enable negotiation of the IPv6 network control protocol. (Enabled by default if the kernel has IPv6 enabled.) .It Va disable-ipv6 Disable negotiation of the IPv6 network control protocol. Since every IPv4 interface in an IPv6-enabled kernel automatically gets an IPv6 address assigned, this option provides for a way to administratively prevent the link from attempting to negotiate IPv6. Note that initialization of an IPv6 interface causes a multicast packet to be sent, which can cause unwanted traffic costs (for dial-on-demand interfaces). .El .Sh EXAMPLES .Bd -literal # spppcontrol bppp0 bppp0: phase=dead myauthproto=chap myauthname="uriah" hisauthproto=chap hisauthname="ifb-gw" norechallenge lcp-timeout=3000 enable-vj enable-ipv6 .Ed .Pp Display the settings for .Li bppp0 . The interface is currently in .Em dead phase, i.e. the LCP layer is down, and no traffic is possible. Both ends of the connection use the CHAP protocol, my end tells remote the system name .Dq Li uriah , and remote is expected to authenticate by the name .Dq Li ifb-gw . Once the initial CHAP handshake was successful, no further CHAP challenges will be transmitted. There are supposedly some known CHAP secrets for both ends of the link which are not being shown. .Bd -literal # spppcontrol bppp0 \e authproto=chap \e myauthname=uriah myauthsecret='some secret' \e hisauthname=ifb-gw hisauthsecret='another' \e norechallenge .Ed .Pp A possible call to .Nm that could have been used to bring the interface into the state shown by the previous example. .Sh SEE ALSO .Xr netstat 1 , .Xr sppp 4 , .Xr ifconfig 8 .Rs .%A B. Lloyd .%A W. Simpson .%T "PPP Authentication Protocols" .%O RFC 1334 .Re .Rs .%A W. Simpson, Editor .%T "The Point-to-Point Protocol (PPP)" .%O RFC 1661 .Re .Rs .%A W. Simpson .%T "PPP Challenge Handshake Authentication Protocol (CHAP)" .%O RFC 1994 .Re .Sh HISTORY The .Nm utility appeared in .Fx 3.0 . .Sh AUTHORS The program was written by .An J\(:org Wunsch , Dresden.