package/network/services/ppp/patches/121-debian_adaptive_lcp_echo.patch

   1 --- a/pppd/lcp.c
   2 +++ b/pppd/lcp.c
   3 @@ -73,6 +73,7 @@ static void lcp_delayed_up __P((void *))
   4   */
   5  int    lcp_echo_interval = 0;  /* Interval between LCP echo-requests */
   6  int    lcp_echo_fails = 0;     /* Tolerance to unanswered echo-requests */
   7 +bool   lcp_echo_adaptive = 0;  /* request echo only if the link was idle */
   8  bool   lax_recv = 0;           /* accept control chars in asyncmap */
   9  bool   noendpoint = 0;         /* don't send/accept endpoint discriminator */
  10
  11 @@ -151,6 +152,8 @@ static option_t lcp_option_list[] = {
  12        OPT_PRIO },
  13      { "lcp-echo-interval", o_int, &lcp_echo_interval,
  14        "Set time in seconds between LCP echo requests", OPT_PRIO },
  15 +    { "lcp-echo-adaptive", o_bool, &lcp_echo_adaptive,
  16 +      "Suppress LCP echo requests if traffic was received", 1 },
  17      { "lcp-restart", o_int, &lcp_fsm[0].timeouttime,
  18        "Set time in seconds between LCP retransmissions", OPT_PRIO },
  19      { "lcp-max-terminate", o_int, &lcp_fsm[0].maxtermtransmits,
  20 @@ -2331,6 +2334,22 @@ LcpSendEchoRequest (f)
  21         }
  22      }
  23
  24 +    /*
  25 +     * If adaptive echos have been enabled, only send the echo request if
  26 +     * no traffic was received since the last one.
  27 +     */
  28 +    if (lcp_echo_adaptive) {
  29 +       static unsigned int last_pkts_in = 0;
  30 +
  31 +       update_link_stats(f->unit);
  32 +       link_stats_valid = 0;
  33 +
  34 +       if (link_stats.pkts_in != last_pkts_in) {
  35 +           last_pkts_in = link_stats.pkts_in;
  36 +           return;
  37 +       }
  38 +    }
  39 +
  40      /*
  41       * Make and send the echo request frame.
  42       */
  43 --- a/pppd/pppd.8
  44 +++ b/pppd/pppd.8
  45 @@ -563,6 +563,11 @@ to 1) if the \fIproxyarp\fR option is us
  46  dynamic IP address option (i.e. set /proc/sys/net/ipv4/ip_dynaddr to
  47  1) in demand mode if the local address changes.
  48  .TP
  49 +.B lcp\-echo\-adaptive
  50 +If this option is used with the \fIlcp\-echo\-failure\fR option then
  51 +pppd will send LCP echo\-request frames only if no traffic was received
  52 +from the peer since the last echo\-request was sent.
  53 +.TP
  54  .B lcp\-echo\-failure \fIn
  55  If this option is given, pppd will presume the peer to be dead
  56  if \fIn\fR LCP echo\-requests are sent without receiving a valid LCP