pppd: Fix spurious LCP echo failures with lcp-echo-adaptive option

If the lcp-echo-adaptive option is specified, it means that seeing
received traffic on the link is considered to be an indication that
the link is working.  Hence, this resets the count of missing LCP
echo-replies to 0 when traffic is seen.  Without this, occasional
echo failures interspersed with link traffic can accumulate and end up
causing a disconnection even when the link is working correctly.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/pppd/lcp.c b/pppd/lcp.c
index 9dc883e..6354f39 100644
--- a/pppd/lcp.c
+++ b/pppd/lcp.c
@@ -2279,6 +2279,8 @@ LcpSendEchoRequest (fsm *f)
 
 	if (get_ppp_stats(f->unit, &cur_stats) && cur_stats.pkts_in != last_pkts_in) {
 	    last_pkts_in = cur_stats.pkts_in;
+	    /* receipt of traffic indicates the link is working... */
+	    lcp_echos_pending = 0;
 	    return;
 	}
     }