..........
beginning of a pretty reproducable scp transfer stall ... it stalls at roughly ~10MB (of a 100+mb file) in this example
client's tcpdump, as i scp-transfer to my ssh server
..........
12:44:15.843067 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [S], seq 277579361, win 5840, options [mss 1460,sackOK,TS val 3747852 ecr 0,nop,wscale 7], length 0
12:44:15.843826 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [S.], seq 2690113123, ack 277579362, win 5792, options [mss 1460,nop,nop,TS val 282639106 ecr 3747852,nop,wscale 6], length 0
12:44:15.843865 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], ack 1, win 46, options [nop,nop,TS val 3747853 ecr 282639106], length 0
12:44:15.972099 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1:22, ack 1, win 91, options [nop,nop,TS val 282639138 ecr 3747853], length 21
12:44:15.972215 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], ack 22, win 46, options [nop,nop,TS val 3747891 ecr 282639138], length 0
12:44:15.972465 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1:22, ack 22, win 46, options [nop,nop,TS val 3747891 ecr 282639138], length 21
12:44:15.972846 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 22, win 91, options [nop,nop,TS val 282639138 ecr 3747891], length 0
12:44:15.972946 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 22:870, ack 22, win 46, options [nop,nop,TS val 3747891 ecr 282639138], length 848
12:44:15.973459 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 870, win 117, options [nop,nop,TS val 282639138 ecr 3747891], length 0
12:44:15.976790 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 22:806, ack 870, win 117, options [nop,nop,TS val 282639139 ecr 3747891], length 784
12:44:15.976989 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 870:894, ack 806, win 58, options [nop,nop,TS val 3747892 ecr 282639139], length 24
12:44:15.983589 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 806:958, ack 894, win 117, options [nop,nop,TS val 282639141 ecr 3747892], length 152
12:44:15.985218 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 894:1038, ack 958, win 71, options [nop,nop,TS val 3747895 ecr 282639141], length 144
12:44:15.998663 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 958:1422, ack 1038, win 144, options [nop,nop,TS val 282639144 ecr 3747895], length 464
12:44:16.001004 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1038:1054, ack 1422, win 83, options [nop,nop,TS val 3747900 ecr 282639144], length 16
12:44:16.040800 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 1054, win 144, options [nop,nop,TS val 282639155 ecr 3747900], length 0
12:44:16.040837 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1054:1102, ack 1422, win 83, options [nop,nop,TS val 3747912 ecr 282639155], length 48
12:44:16.041549 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 1102, win 144, options [nop,nop,TS val 282639155 ecr 3747912], length 0
12:44:16.041962 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1422:1470, ack 1102, win 144, options [nop,nop,TS val 282639155 ecr 3747912], length 48
12:44:16.042097 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1102:1166, ack 1470, win 83, options [nop,nop,TS val 3747912 ecr 282639155], length 64
12:44:16.079325 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 1166, win 144, options [nop,nop,TS val 282639165 ecr 3747912], length 0
12:44:16.120083 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1470:1534, ack 1166, win 144, options [nop,nop,TS val 282639175 ecr 3747912], length 64
12:44:16.120202 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1166:1406, ack 1534, win 83, options [nop,nop,TS val 3747935 ecr 282639175], length 240
12:44:16.120703 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 1406, win 170, options [nop,nop,TS val 282639175 ecr 3747935], length 0
12:44:16.156491 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1534:1726, ack 1406, win 170, options [nop,nop,TS val 282639184 ecr 3747935], length 192
12:44:16.159820 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1406:1790, ack 1726, win 95, options [nop,nop,TS val 3747947 ecr 282639184], length 384
12:44:16.163818 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1726:1758, ack 1790, win 197, options [nop,nop,TS val 282639186 ecr 3747947], length 32
12:44:16.164040 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1790:1918, ack 1758, win 95, options [nop,nop,TS val 3747949 ecr 282639186], length 128
12:44:16.173668 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1758:1806, ack 1918, win 223, options [nop,nop,TS val 282639188 ecr 3747949], length 48
12:44:16.176892 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1918:1982, ack 1806, win 95, options [nop,nop,TS val 3747952 ecr 282639188], length 64
12:44:16.178976 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1806:1886, ack 1982, win 223, options [nop,nop,TS val 282639189 ecr 3747952], length 80
12:44:16.217150 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], ack 1886, win 95, options [nop,nop,TS val 3747965 ecr 282639189], length 0
12:44:16.239396 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1886:1934, ack 1982, win 223, options [nop,nop,TS val 282639205 ecr 3747965], length 48
12:44:16.239463 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], ack 1934, win 95, options [nop,nop,TS val 3747971 ecr 282639205], length 0
12:44:16.239747 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 1982:2078, ack 1934, win 95, options [nop,nop,TS val 3747971 ecr 282639205], length 96
12:44:16.240667 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [P.], seq 1934:1982, ack 2078, win 223, options [nop,nop,TS val 282639205 ecr 3747971], length 48
12:44:16.241879 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 2078:3526, ack 1982, win 95, options [nop,nop,TS val 3747972 ecr 282639205], length 1448
12:44:16.241956 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 3526:4974, ack 1982, win 95, options [nop,nop,TS val 3747972 ecr 282639205], length 1448
12:44:16.242021 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 4974:6422, ack 1982, win 95, options [nop,nop,TS val 3747972 ecr 282639205], length 1448
12:44:16.242081 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 6422:7870, ack 1982, win 95, options [nop,nop,TS val 3747972 ecr 282639205], length 1448
........
over a mb of probably non-interesting normal transferring over my wifi connection ... about 9mb of data at almost 2MB/sec
........
12:44:24.518981 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9628014:9629462, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519003 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9629462:9630910, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519021 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9630910:9632358, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519263 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9315422, win 18100, options [nop,nop,TS val 282641228 ecr 3750399], length 0
12:44:24.519292 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9632358:9633806, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519313 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9633806:9635254, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519332 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9635254:9636702, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519353 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9636702:9638150, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519373 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9638150:9639598, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519391 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9639598:9641046, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519580 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9318318, win 18100, options [nop,nop,TS val 282641228 ecr 3750399], length 0
12:44:24.519605 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9641046:9642494, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519628 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9642494:9643942, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519907 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9321214, win 18100, options [nop,nop,TS val 282641229 ecr 3750399], length 0
12:44:24.519936 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9643942:9645390, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.519960 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9645390:9646838, ack 4766, win 95, options [nop,nop,TS val 3750455 ecr 282640929], length 1448
12:44:24.525082 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9324110, win 18100, options [nop,nop,TS val 282641229 ecr 3750399], length 0
12:44:24.525114 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9646838:9648286, ack 4766, win 95, options [nop,nop,TS val 3750457 ecr 282640929], length 1448
12:44:24.525137 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9648286:9649734, ack 4766, win 95, options [nop,nop,TS val 3750457 ecr 282640929], length 1448
12:44:24.525156 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9649734:9651182, ack 4766, win 95, options [nop,nop,TS val 3750457 ecr 282640929], length 1448
12:44:24.525488 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9327006, win 18100, options [nop,nop,TS val 282641229 ecr 3750399], length 0
12:44:24.525515 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9651182:9652630, ack 4766, win 95, options [nop,nop,TS val 3750457 ecr 282640929], length 1448
12:44:24.525538 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9652630:9654078, ack 4766, win 95, options [nop,nop,TS val 3750457 ecr 282640929], length 1448
12:44:24.527803 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9329902, win 18100, options [nop,nop,TS val 282641229 ecr 3750399], length 0
12:44:24.527832 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9654078:9655526, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 1448
12:44:24.527856 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9655526:9656974, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 1448
12:44:24.528137 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9332798, win 18100, options [nop,nop,TS val 282641230 ecr 3750399], length 0
12:44:24.528163 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9656974:9658422, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 1448
12:44:24.528185 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9658422:9659870, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 1448
12:44:24.528552 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9335694, win 18100, options [nop,nop,TS val 282641230 ecr 3750399], length 0
12:44:24.528577 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9659870:9661318, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 1448
12:44:24.528601 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9661318:9662766, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 1448
12:44:24.528621 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9662766:9664214, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 1448
12:44:24.528852 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9341486, win 18100, options [nop,nop,TS val 282641234 ecr 3750399], length 0
12:44:24.528881 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [.], seq 9664214:9665662, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 1448
12:44:24.528903 IP 10.0.0.4.51612 > 10.0.0.1.ssh: Flags [P.], seq 9665662:9666606, ack 4766, win 95, options [nop,nop,TS val 3750458 ecr 282640929], length 944
...............
something happens here?
...............
12:44:24.529159 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9344382, win 18100, options [nop,nop,TS val 282641234 ecr 3750399], length 0
12:44:24.529583 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9347278, win 18100, options [nop,nop,TS val 282641234 ecr 3750399], length 0
12:44:24.531951 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9350174, win 18100, options [nop,nop,TS val 282641234 ecr 3750399], length 0
12:44:24.532623 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9353070, win 18100, options [nop,nop,TS val 282641252 ecr 3750399], length 0
12:44:24.533018 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9355966, win 18100, options [nop,nop,TS val 282641252 ecr 3750399], length 0
12:44:24.546760 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9358862, win 18100, options [nop,nop,TS val 282641252 ecr 3750399], length 0
12:44:24.549300 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9361758, win 18100, options [nop,nop,TS val 282641253 ecr 3750399], length 0
12:44:24.549529 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9364654, win 18100, options [nop,nop,TS val 282641253 ecr 3750399], length 0
12:44:24.549837 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9367550, win 18100, options [nop,nop,TS val 282641253 ecr 3750399], length 0
12:44:24.550086 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9370446, win 18100, options [nop,nop,TS val 282641253 ecr 3750399], length 0
12:44:24.550344 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9372710, win 18100, options [nop,nop,TS val 282641253 ecr 3750399], length 0
12:44:24.550623 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9375606, win 18100, options [nop,nop,TS val 282641253 ecr 3750399], length 0
12:44:24.550951 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9378502, win 18100, options [nop,nop,TS val 282641254 ecr 3750401], length 0
12:44:24.551255 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9381398, win 18100, options [nop,nop,TS val 282641254 ecr 3750402], length 0
12:44:24.551676 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9384294, win 18100, options [nop,nop,TS val 282641254 ecr 3750402], length 0
12:44:24.551971 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9387190, win 18100, options [nop,nop,TS val 282641254 ecr 3750406], length 0
12:44:24.552283 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9390086, win 18100, options [nop,nop,TS val 282641254 ecr 3750406], length 0
12:44:24.552622 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9392982, win 18100, options [nop,nop,TS val 282641255 ecr 3750408], length 0
12:44:24.552970 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9395878, win 18100, options [nop,nop,TS val 282641255 ecr 3750408], length 0
12:44:24.553293 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9398774, win 18100, options [nop,nop,TS val 282641255 ecr 3750408], length 0
12:44:24.553605 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9476966, win 18100, options [nop,nop,TS val 282641260 ecr 3750437], length 0
12:44:24.553952 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9479862, win 18100, options [nop,nop,TS val 282641260 ecr 3750437], length 0
12:44:24.554236 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9482758, win 18100, options [nop,nop,TS val 282641261 ecr 3750437], length 0
12:44:24.554529 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9485654, win 18100, options [nop,nop,TS val 282641261 ecr 3750437], length 0
12:44:24.554841 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9488550, win 18100, options [nop,nop,TS val 282641261 ecr 3750437], length 0
12:44:24.555230 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9508822, win 18100, options [nop,nop,TS val 282641267 ecr 3750437], length 0
12:44:24.555596 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9511718, win 18100, options [nop,nop,TS val 282641267 ecr 3750437], length 0
12:44:24.555901 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9514614, win 18100, options [nop,nop,TS val 282641267 ecr 3750437], length 0
12:44:24.556231 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9517510, win 18100, options [nop,nop,TS val 282641267 ecr 3750437], length 0
12:44:24.556542 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9520406, win 18100, options [nop,nop,TS val 282641268 ecr 3750437], length 0
12:44:24.556889 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9562854, win 18100, options [nop,nop,TS val 282641270 ecr 3750441], length 0
12:44:24.557213 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9565750, win 18100, options [nop,nop,TS val 282641270 ecr 3750441], length 0
12:44:24.557556 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9568646, win 18100, options [nop,nop,TS val 282641271 ecr 3750441], length 0
12:44:24.557805 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9571542, win 18100, options [nop,nop,TS val 282641271 ecr 3750441], length 0
12:44:24.558813 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9574438, win 18100, options [nop,nop,TS val 282641271 ecr 3750441], length 0
12:44:24.558838 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9620774, win 18100, options [nop,nop,TS val 282641274 ecr 3750454], length 0
12:44:24.558891 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9623670, win 18100, options [nop,nop,TS val 282641274 ecr 3750454], length 0
12:44:24.559167 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9626566, win 18100, options [nop,nop,TS val 282641275 ecr 3750454], length 0
12:44:24.559427 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9629462, win 18100, options [nop,nop,TS val 282641275 ecr 3750455], length 0
12:44:24.559721 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9632358, win 18100, options [nop,nop,TS val 282641275 ecr 3750455], length 0
12:44:24.560006 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9649734, win 18100, options [nop,nop,TS val 282641277 ecr 3750457], length 0
12:44:24.560255 IP 10.0.0.1.ssh > 10.0.0.4.51612: Flags [.], ack 9652630, win 18100, options [nop,nop,TS val 282641277 ecr 3750457], length 0
12:44:24.560510 IP 10.0.0.1.ssh > 10.0.0.4.51612: 
................. this is exactly  where tcpdump actually stopped logging .... it usually does this with the stalls ... just ends in the middle of a log-line .........
................. this is also when scp no longer appears to be properly transferring data, even though something is still transferring on my wifi device, for a few seconds longer, after which it stops and scp reports "stalled" -- it's interesting since on the server's tcpdump, it is receiving packets, but with very strange seq numbers? i don't know :s ........