l2tp: Unset ephemeral ports by default

Disable use of ephemeral ports by default since it poses problems with
NAT and wasn't used in earlier versions of accel-ppp.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

accel-pppd/accel-ppp.conf.5

@@ -462,7 +462,7 @@ AVPs that support it).
 Specifies if an arbitrary source port is used when replying to a tunnel
 establishment request. When this option is deactivated, the destination
 port of the incoming request (SCCRQ) is used as source port for the
-reply (SCCRP). Default value is 1.
+reply (SCCRP). Default value is 0.
 .SH [radius]
 .br
 Configuration of RADIUS module.

accel-pppd/ctrl/l2tp/l2tp.c

@@ -52,7 +52,7 @@ int conf_verbose = 0;
 int conf_hide_avps = 0;
 int conf_avp_permissive = 0;
 static int conf_port = L2TP_PORT;
-static int conf_ephemeral_ports = 1;
+static int conf_ephemeral_ports = 0;
 static int conf_timeout = 60;
 static int conf_rtimeout = 5;
 static int conf_retransmit = 5;