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ip/ppp: lower echo timeout to 2 periods (10 seconds)

it usually never recovers...

--- a/sys/src/cmd/ip/ppp/ppp.c

+++ b/sys/src/cmd/ip/ppp/ppp.c

@@ -1524,7 +1524,7 @@

 pingtimer(PPP* ppp)

 {

 	if(ppp->lcp->echotimeout == 0 || ppp->lcp->echoack)

-		ppp->lcp->echotimeout = (3*4*1000+Period-1)/Period;

+		ppp->lcp->echotimeout = Echotimeout;

 	else if(--(ppp->lcp->echotimeout) <= 0){

 		netlog("ppp: echo request timeout\n");

 		terminate(ppp, "echo timeout", 0);

--- a/sys/src/cmd/ip/ppp/ppp.h

+++ b/sys/src/cmd/ip/ppp/ppp.h

@@ -172,6 +172,7 @@

 	Period=		5*1000,	/* period of retransmit process (in ms) */

 	Timeout=	20,	/* xmit timeout (in Periods) */

+	Echotimeout=	2,	/* echo timeout (in Periods) */

 	Buflen=		4096,

 	MAX_STATES=	16,		/* van jacobson compression states */