4 files changed, 34 insertions, 0 deletions
diff --git a/usr.sbin/ppp/command.c b/usr.sbin/ppp/command.c
index d05471c..635b197 100644
--- a/usr.sbin/ppp/command.c
+++ b/usr.sbin/ppp/command.c
@@ -773,6 +773,8 @@ static struct cmdtab const NatCommands[] =
   {"punch_fw", NULL, nat_PunchFW, LOCAL_AUTH,
    "firewall control", "nat punch_fw [base count]"},
 #endif
+  {"skinny_port", NULL, nat_SkinnyPort, LOCAL_AUTH,
+   "TCP port used by Skinny Station protocol", "nat skinny_port [port]"},
   {"same_ports", NULL, NatOption, LOCAL_AUTH,
    "try to leave port numbers unchanged", "nat same_ports yes|no",
    (const void *) PKT_ALIAS_SAME_PORTS},
diff --git a/usr.sbin/ppp/nat_cmd.c b/usr.sbin/ppp/nat_cmd.c
index deb9932..8172fd6 100644
--- a/usr.sbin/ppp/nat_cmd.c
+++ b/usr.sbin/ppp/nat_cmd.c
@@ -470,6 +470,29 @@ nat_PunchFW(struct cmdargs const *arg)
 }
 #endif
 
+int
+nat_SkinnyPort(struct cmdargs const *arg)
+{
+  char *end;
+  long port;
+
+  if (arg->argc == arg->argn) {
+    PacketAliasSetSkinnyPort(0);
+    return 0;
+  }
+
+  if (arg->argc != arg->argn + 1)
+    return -1;
+
+  port = strtol(arg->argv[arg->argn], &end, 10);
+  if (*end != '\0' || port < 0)
+    return -1;
+
+  PacketAliasSetSkinnyPort(port);
+
+  return 0;
+}
+
 static struct mbuf *
 nat_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp,
                 int pri, u_short *proto)
diff --git a/usr.sbin/ppp/nat_cmd.h b/usr.sbin/ppp/nat_cmd.h
index c70afb0..f4c3655 100644
--- a/usr.sbin/ppp/nat_cmd.h
+++ b/usr.sbin/ppp/nat_cmd.h
@@ -37,5 +37,6 @@ extern int nat_SetTarget(struct cmdargs const *);
 #ifndef NO_FW_PUNCH
 extern int nat_PunchFW(struct cmdargs const *);
 #endif
+extern int nat_SkinnyPort(struct cmdargs const *);
 
 extern struct layer natlayer;
diff --git a/usr.sbin/ppp/ppp.8.m4 b/usr.sbin/ppp/ppp.8.m4
index e58b4a4..a3de3bf 100644
--- a/usr.sbin/ppp/ppp.8.m4
+++ b/usr.sbin/ppp/ppp.8.m4
@@ -3470,6 +3470,14 @@ The range will be cleared when the
 command is run.
 .Pp
 If no arguments are given, firewall punching is disabled.
+.It nat skinny_port Op Ar port
+This command tells
+.Nm
+which TCP port is used by the Skinny Station protocol.  Skinny is used by
+Cisco IP phones to communicate with Cisco Call Managers to setup voice
+over IP calls.  The typical port used by Skinny is 2000.
+.Pp
+If no argument is given, skinny aliasing is disabled.
 .It nat same_ports yes|no
 When enabled, this command will tell the network address translation engine to
 attempt to avoid changing the port number on outgoing packets.