1 files changed, 56 insertions, 0 deletions
diff --git a/user/ppp/34_all_lcp-echo-adaptive.patch b/user/ppp/34_all_lcp-echo-adaptive.patch
new file mode 100644
index 000000000..6faf19a27
--- /dev/null
+++ b/user/ppp/34_all_lcp-echo-adaptive.patch
@@ -0,0 +1,56 @@
+--- ppp-2.4.5/pppd/lcp.c
++++ ppp-2.4.5/pppd/lcp.c
+@@ -73,6 +73,7 @@
+  */
+ int	lcp_echo_interval = 0; 	/* Interval between LCP echo-requests */
+ int	lcp_echo_fails = 0;	/* Tolerance to unanswered echo-requests */
++bool	lcp_echo_adaptive = 0;	/* request echo only if the link was idle */
+ bool	lax_recv = 0;		/* accept control chars in asyncmap */
+ bool	noendpoint = 0;		/* don't send/accept endpoint discriminator */
+ 
+@@ -151,6 +152,8 @@
+       OPT_PRIO },
+     { "lcp-echo-interval", o_int, &lcp_echo_interval,
+       "Set time in seconds between LCP echo requests", OPT_PRIO },
++    { "lcp-echo-adaptive", o_bool, &lcp_echo_adaptive,
++      "Suppress LCP echo requests if traffic was received", 1 },
+     { "lcp-restart", o_int, &lcp_fsm[0].timeouttime,
+       "Set time in seconds between LCP retransmissions", OPT_PRIO },
+     { "lcp-max-terminate", o_int, &lcp_fsm[0].maxtermtransmits,
+@@ -2322,6 +2325,22 @@
+     }
+ 
+     /*
++     * If adaptive echos have been enabled, only send the echo request if
++     * no traffic was received since the last one.
++     */
++    if (lcp_echo_adaptive) {
++       static unsigned int last_pkts_in = 0;
++
++       update_link_stats(f->unit);
++       link_stats_valid = 0;
++
++       if (link_stats.pkts_in != last_pkts_in) {
++           last_pkts_in = link_stats.pkts_in;
++           return;
++       }
++    }
++
++    /*
+      * Make and send the echo request frame.
+      */
+     if (f->state == OPENED) {
+--- ppp-2.4.5/pppd/pppd.8
++++ ppp-2.4.5/pppd/pppd.8
+@@ -549,6 +549,11 @@
+ dynamic IP address option (i.e. set /proc/sys/net/ipv4/ip_dynaddr to
+ 1) in demand mode if the local address changes.
+ .TP
++.B lcp\-echo\-adaptive
++If this option is used with the \fIlcp\-echo\-failure\fR option then
++pppd will send LCP echo\-request frames only if no traffic was received
++from the peer since the last echo\-request was sent.
++.TP
+ .B lcp\-echo\-failure \fIn
+ If this option is given, pppd will presume the peer to be dead
+ if \fIn\fR LCP echo\-requests are sent without receiving a valid LCP