diff --git a/usr.sbin/ppp/alias_cmd.c b/usr.sbin/ppp/alias_cmd.c
index 2c11e085b7c0..979b0b575a43 100644
--- a/usr.sbin/ppp/alias_cmd.c
+++ b/usr.sbin/ppp/alias_cmd.c
@@ -2,7 +2,7 @@
  * The code in this file was written by Eivind Eklund <perhaps@yes.no>,
  * who places it in the public domain without restriction.
  *
- *	$Id: alias_cmd.c,v 1.19 1999/01/28 01:56:30 brian Exp $
+ *	$Id: alias_cmd.c,v 1.20 1999/03/07 15:02:37 brian Exp $
  */
 
 #include <sys/param.h>
@@ -239,3 +239,27 @@ alias_ProxyRule(struct cmdargs const *arg)
 
   return PacketAliasProxyRule(cmd);
 }
+
+int
+alias_Pptp(struct cmdargs const *arg)
+{
+  struct in_addr addr;
+
+  if (arg->argc == arg->argn) {
+    addr.s_addr = INADDR_NONE;
+    PacketAliasPptp(addr);
+    return 0;
+  }
+
+  if (arg->argc != arg->argn + 1)
+    return -1;
+
+  addr = GetIpAddr(arg->argv[arg->argn]);
+  if (addr.s_addr == INADDR_NONE) {
+    log_Printf(LogWARN, "%s: invalid address\n", arg->argv[arg->argn]);
+    return 1;
+  }
+
+  PacketAliasPptp(addr);
+  return 0;
+}
diff --git a/usr.sbin/ppp/alias_cmd.h b/usr.sbin/ppp/alias_cmd.h
index 072d3d121077..cf96bcf234cf 100644
--- a/usr.sbin/ppp/alias_cmd.h
+++ b/usr.sbin/ppp/alias_cmd.h
@@ -2,7 +2,7 @@
  * The code in this file was written by Eivind Eklund <perhaps@yes.no>,
  * who places it in the public domain without restriction.
  *
- *	$Id: alias_cmd.h,v 1.8 1998/05/21 21:43:45 brian Exp $
+ *	$Id: alias_cmd.h,v 1.9 1999/03/07 15:02:37 brian Exp $
  */
 
 struct cmdargs;
@@ -10,3 +10,4 @@ struct cmdargs;
 extern int alias_RedirectPort(struct cmdargs const *);
 extern int alias_RedirectAddr(struct cmdargs const *);
 extern int alias_ProxyRule(struct cmdargs const *);
+extern int alias_Pptp(struct cmdargs const *);
diff --git a/usr.sbin/ppp/command.c b/usr.sbin/ppp/command.c
index e0fcf29f41ca..58dce7fd2ef1 100644
--- a/usr.sbin/ppp/command.c
+++ b/usr.sbin/ppp/command.c
@@ -17,7 +17,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Id: command.c,v 1.186 1999/03/04 17:42:15 brian Exp $
+ * $Id: command.c,v 1.187 1999/03/07 15:02:37 brian Exp $
  *
  */
 #include <sys/param.h>
@@ -141,7 +141,7 @@
 #define NEG_DNS		52
 
 const char Version[] = "2.11";
-const char VersionDate[] = "$Date: 1999/03/04 17:42:15 $";
+const char VersionDate[] = "$Date: 1999/03/07 15:02:37 $";
 
 static int ShowCommand(struct cmdargs const *);
 static int TerminalCommand(struct cmdargs const *);
@@ -554,6 +554,8 @@ static struct cmdtab const AliasCommands[] =
    (const void *) PKT_ALIAS_LOG},
   {"port", NULL, alias_RedirectPort, LOCAL_AUTH,
    "port redirection", "alias port [proto addr_local:port_local  port_alias]"},
+  {"pptp", NULL, alias_Pptp, LOCAL_AUTH,
+   "Set the PPTP address", "alias pptp IP"},
   {"proxy", NULL, alias_ProxyRule, LOCAL_AUTH,
    "proxy control", "alias proxy server host[:port] ..."},
   {"same_ports", NULL, AliasOption, LOCAL_AUTH,
diff --git a/usr.sbin/ppp/nat_cmd.c b/usr.sbin/ppp/nat_cmd.c
index 2c11e085b7c0..979b0b575a43 100644
--- a/usr.sbin/ppp/nat_cmd.c
+++ b/usr.sbin/ppp/nat_cmd.c
@@ -2,7 +2,7 @@
  * The code in this file was written by Eivind Eklund <perhaps@yes.no>,
  * who places it in the public domain without restriction.
  *
- *	$Id: alias_cmd.c,v 1.19 1999/01/28 01:56:30 brian Exp $
+ *	$Id: alias_cmd.c,v 1.20 1999/03/07 15:02:37 brian Exp $
  */
 
 #include <sys/param.h>
@@ -239,3 +239,27 @@ alias_ProxyRule(struct cmdargs const *arg)
 
   return PacketAliasProxyRule(cmd);
 }
+
+int
+alias_Pptp(struct cmdargs const *arg)
+{
+  struct in_addr addr;
+
+  if (arg->argc == arg->argn) {
+    addr.s_addr = INADDR_NONE;
+    PacketAliasPptp(addr);
+    return 0;
+  }
+
+  if (arg->argc != arg->argn + 1)
+    return -1;
+
+  addr = GetIpAddr(arg->argv[arg->argn]);
+  if (addr.s_addr == INADDR_NONE) {
+    log_Printf(LogWARN, "%s: invalid address\n", arg->argv[arg->argn]);
+    return 1;
+  }
+
+  PacketAliasPptp(addr);
+  return 0;
+}
diff --git a/usr.sbin/ppp/nat_cmd.h b/usr.sbin/ppp/nat_cmd.h
index 072d3d121077..cf96bcf234cf 100644
--- a/usr.sbin/ppp/nat_cmd.h
+++ b/usr.sbin/ppp/nat_cmd.h
@@ -2,7 +2,7 @@
  * The code in this file was written by Eivind Eklund <perhaps@yes.no>,
  * who places it in the public domain without restriction.
  *
- *	$Id: alias_cmd.h,v 1.8 1998/05/21 21:43:45 brian Exp $
+ *	$Id: alias_cmd.h,v 1.9 1999/03/07 15:02:37 brian Exp $
  */
 
 struct cmdargs;
@@ -10,3 +10,4 @@ struct cmdargs;
 extern int alias_RedirectPort(struct cmdargs const *);
 extern int alias_RedirectAddr(struct cmdargs const *);
 extern int alias_ProxyRule(struct cmdargs const *);
+extern int alias_Pptp(struct cmdargs const *);
diff --git a/usr.sbin/ppp/ppp.8 b/usr.sbin/ppp/ppp.8
index 0d4a0671e784..7d2cb58633a8 100644
--- a/usr.sbin/ppp/ppp.8
+++ b/usr.sbin/ppp/ppp.8
@@ -1,4 +1,4 @@
-.\" $Id: ppp.8,v 1.155 1999/03/07 11:54:42 brian Exp $
+.\" $Id: ppp.8,v 1.156 1999/03/07 15:02:38 brian Exp $
 .Dd 20 September 1995
 .nr XX \w'\fC00'
 .Os FreeBSD
@@ -2681,6 +2681,29 @@ or
 and only connections of the given protocol
 are matched.  This option is useful if you wish to run things like
 Internet phone on the machines behind your gateway.
+.It "alias pptp" Op Ar addr
+This tells
+.Nm
+to alias any
+.Em G Ns No eneral
+.Em R Ns No outing
+.Em E Ns No encapsulated
+.Pq Dv IPPROTO_GRE
+packets using
+.Ar addr
+rather than the local interface address.  This allows the uses of the
+.Em P Ns No oint
+to
+.Em P Ns No oint
+.Em T Ns No unneling
+.Em P Ns No rotocol
+on a machine on the internal network.
+.Pp
+If
+.Ar addr
+is not specified,
+.Dv PPTP
+aliasing is disabled.
 .It "alias proxy cmd" Ar arg Ns No ...
 This command tells
 .Nm
diff --git a/usr.sbin/ppp/ppp.8.m4 b/usr.sbin/ppp/ppp.8.m4
index 0d4a0671e784..7d2cb58633a8 100644
--- a/usr.sbin/ppp/ppp.8.m4
+++ b/usr.sbin/ppp/ppp.8.m4
@@ -1,4 +1,4 @@
-.\" $Id: ppp.8,v 1.155 1999/03/07 11:54:42 brian Exp $
+.\" $Id: ppp.8,v 1.156 1999/03/07 15:02:38 brian Exp $
 .Dd 20 September 1995
 .nr XX \w'\fC00'
 .Os FreeBSD
@@ -2681,6 +2681,29 @@ or
 and only connections of the given protocol
 are matched.  This option is useful if you wish to run things like
 Internet phone on the machines behind your gateway.
+.It "alias pptp" Op Ar addr
+This tells
+.Nm
+to alias any
+.Em G Ns No eneral
+.Em R Ns No outing
+.Em E Ns No encapsulated
+.Pq Dv IPPROTO_GRE
+packets using
+.Ar addr
+rather than the local interface address.  This allows the uses of the
+.Em P Ns No oint
+to
+.Em P Ns No oint
+.Em T Ns No unneling
+.Em P Ns No rotocol
+on a machine on the internal network.
+.Pp
+If
+.Ar addr
+is not specified,
+.Dv PPTP
+aliasing is disabled.
 .It "alias proxy cmd" Ar arg Ns No ...
 This command tells
 .Nm