With recent kernel versions (1.3.80 and 1.3.81) I am occasionally getting
continious modem activity when no program is actually transfering data
over the PPP link. I am running ppp 2.2.0f on the Linux end and the server
(129.8.152.1) runs ppp 2.2 for NextStep 3.3. From tcpdump, it looks like
the server keeps re-sending packets to my machine and my machine keeps
acknowledging them, but somehow the ack packet is corrupted and it not
recognized by the server.
I am fairly sure that the problem is on Linux end, because it never happened
with kernel versions before 1.3.80 or between the NeXT and any other machine
on the network.
00:44:03.315077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:03.315077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:03.365077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:03.365077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:03.515077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:03.515077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:03.555077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:03.555077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:03.695077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:03.695077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:03.745077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:03.745077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:03.885077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:03.885077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:03.935077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:03.935077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:04.085077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:04.085077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:04.125077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:04.125077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:04.265077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:04.265077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:04.455077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:04.455077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:04.595077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:04.595077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:04.645077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:04.645077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:04.825077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:04.825077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:04.965077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:04.965077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:05.025077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:05.025077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:05.205077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:05.205077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:05.345077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:05.345077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:05.405077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:05.405077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:05.575077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:05.575077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:05.715077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:05.715077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:05.765077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:05.765077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:05.955077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:05.955077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:06.095077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:06.095077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:06.145077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:06.145077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:06.335077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:06.335077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:06.475077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:06.475077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:06.535077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:06.535077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:06.705077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:06.705077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:06.845077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:06.845077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:06.885077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:06.885077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:07.015077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:07.015077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:07.085077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:07.085077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:07.275077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:07.275077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:07.415077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:07.415077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:07.465077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:07.465077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:07.645077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:07.645077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:07.785077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:07.785077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:07.845077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:07.845077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.025077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.025077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.175077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.175077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.235077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.235077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.345077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.345077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.405077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.405077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.595077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.595077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.645077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.645077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.775077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.775077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:08.965077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:08.965077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:09.105077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:09.105077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:09.155077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:09.155077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:09.345077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:09.345077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:09.485077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:09.485077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:09.545077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:09.545077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:09.725077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:09.725077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:09.865077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:09.865077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:09.925077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:09.925077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:10.095077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:10.095077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:10.235077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:10.235077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:10.275077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:10.275077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:10.475077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:10.475077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:10.525077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:10.525077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:10.655077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:10.655077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:10.855077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:10.855077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:10.995077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:10.995077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:11.045077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:11.045077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:11.225077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:11.225077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:11.365077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:11.365077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:11.415077 129.8.152.1.514 > 129.8.152.101.1023: S 3254993409:3254993409(0) ack 2339639884 win 4096 <mss 1024>
00:44:11.415077 129.8.152.101.1023 > 129.8.152.1.514: . ack 1 win 29680
00:44:13.405077 129.8.152.101.1983 > 129.8.152.1.7: S 3875145353:3875145353(0) win 512 <mss 1460> [tos 0x10]
00:44:16.395077 129.8.152.101.1983 > 129.8.152.1.7: S 3875145353:3875145353(0) win 29200 <mss 1460> [tos 0x10]
-- _. _ . (_ ,_ _ , . / ` _ _L | Email: Oleg Kibirev <oleg@math.CSUFresno.EDU> ._)| U(_)\/\/ \_,(_L/L | Visit http://math.math.CSUFresno.EDU/~oleg/math.html ------------------------' to get my programs + PGP public key (and resume:)