.\" manual page [] for pppd 2.4
-.\" $Id: pppd.8,v 1.62 2002/04/02 13:54:59 dfs Exp $
+.\" $Id: pppd.8,v 1.64 2002/06/01 08:47:34 mjb Exp $
.\" SH section heading
.\" SS subsection heading
.\" LP paragraph
\fBether\fR and \fBarp\fR, are not permitted. Generally the filter
expression should be enclosed in single-quotes to prevent whitespace
in the expression from being interpreted by the shell. This option
-is currently only available under NetBSD, and then only
+is currently only available under NetBSD or Linux, and then only
if both the kernel and pppd were compiled with PPP_FILTER defined.
.TP
.B allow-ip \fIaddress(es)
option disables all other compression types. This option enables
both 40\-bit and 128\-bit encryption. In order for MPPE to successfully
come up, you must have authenticated with either MS-CHAP or MS-CHAPv2.
+This option is presently only supported under Linux, and only if your
+kernel has been configured to include MPPE support.
.TP
.B require-mppe-40
Require the use of MPPE, with 40\-bit encryption.