Both. Same result (connection reset).
Yes.
No, because it was not needed with previous versions of mwan3.
Here is the dump (started tcpdump before the request and stopped after the "Connection Reset" appeared) for accessing stackoverflow.com.
02:18:11.527061 IP dw.lan.22022 > admin.lan.3408: Flags [P.], seq 2081114514:2081114566, ack 2569273824, win 18760, length 52
02:18:11.527314 IP admin.lan.3408 > dw.lan.22022: Flags [.], ack 52, win 65083, length 0
02:18:11.527490 IP dw.lan.22022 > admin.lan.3408: Flags [P.], seq 52:104, ack 1, win 18760, length 52
02:18:11.527886 IP dw.lan.22022 > admin.lan.3408: Flags [P.], seq 104:172, ack 1, win 18760, length 68
02:18:11.528128 IP admin.lan.3408 > dw.lan.22022: Flags [.], ack 172, win 64963, length 0
02:18:11.528362 IP dw.lan.22022 > admin.lan.3408: Flags [P.], seq 172:224, ack 1, win 18760, length 52
02:18:11.531975 IP dw.lan.22022 > admin.lan.3408: Flags [P.], seq 224:276, ack 1, win 18760, length 52
02:18:11.532216 IP admin.lan.3408 > dw.lan.22022: Flags [.], ack 276, win 64859, length 0
02:18:11.532481 IP dw.lan.22022 > admin.lan.3408: Flags [P.], seq 276:392, ack 1, win 18760, length 116
02:18:11.702271 IP admin.lan.3408 > dw.lan.22022: Flags [.], ack 392, win 64743, length 0
02:18:13.476353 IP admin.lan.55680 > dw.lan.domain: 41840+ A? XXX.XXX.XXX.XXX. (35)
02:18:13.720518 IP dw.lan.domain > admin.lan.55680: 41840 1/0/1 A YYY.YYY.YYY.YYY (62)
02:18:13.722759 IP admin.lan.61445 > dw.lan.domain: 56446+ A? XXX.XXX.XXX.XXX. (35)
02:18:13.723161 IP dw.lan.domain > admin.lan.61445: 56446 1/0/0 A YYY.YYY.YYY.YYY (51)
02:18:14.461931 IP admin.lan.3906 > stackoverflow.com.www: Flags [S], seq 3773333230, win 65535, options [mss 1460,nop,nop,sackOK], length 0
02:18:17.437084 IP admin.lan.3906 > stackoverflow.com.www: Flags [S], seq 3773333230, win 65535, options [mss 1460,nop,nop,sackOK], length 0
02:18:23.472669 IP admin.lan.3906 > stackoverflow.com.www: Flags [S], seq 3773333230, win 65535, options [mss 1460,nop,nop,sackOK], length 0
02:18:35.446010 IP admin.lan.49953 > dw.lan.domain: 48995+ A? www.stackoverflow.com. (39)
02:18:35.446511 IP dw.lan.domain > admin.lan.49953: 48995 2/0/0 CNAME stackoverflow.com., A 198.252.206.16 (86)
02:18:35.447460 IP admin.lan.3908 > stackoverflow.com.www: Flags [S], seq 3147207046, win 65535, options [mss 1460,nop,nop,sackOK], length 0
02:18:38.461057 IP admin.lan.3908 > stackoverflow.com.www: Flags [S], seq 3147207046, win 65535, options [mss 1460,nop,nop,sackOK], length 0
02:18:42.593517 IP admin.lan.netbios-dgm > 10.0.2.15.netbios-dgm: NBT UDP PACKET(138)
02:18:43.481001 IP admin.lan.49980 > dw.lan.domain: 18073+ A? XXX.XXX.XXX.XXX. (35)
02:18:43.481533 IP dw.lan.domain > admin.lan.49980: 18073 1/0/0 A YYY.YYY.YYY.YYY (51)
02:18:44.396055 IP admin.lan.3908 > stackoverflow.com.www: Flags [S], seq 3147207046, win 65535, options [mss 1460,nop,nop,sackOK], length 0
02:19:00.255458 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2815130761:2815130845, ack 1753955101, win 64699, length 84
02:19:00.291571 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 84, win 27968, length 0
02:19:00.291829 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 84:136, ack 1, win 64699, length 52
02:19:00.291983 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 136, win 27968, length 0
02:19:00.292959 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 1:85, ack 136, win 27968, length 84
02:19:00.293557 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 136:236, ack 85, win 64615, length 100
02:19:00.331518 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 236, win 27968, length 0
02:19:00.331758 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 236:288, ack 85, win 64615, length 52
02:19:00.331884 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 288, win 27968, length 0
02:19:00.338138 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 85:617, ack 288, win 27968, length 532
02:19:00.339793 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 617:685, ack 288, win 27968, length 68
02:19:00.340024 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 685, win 65535, length 0
02:19:01.511636 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 288:372, ack 685, win 65535, length 84
02:19:01.551501 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 372, win 27968, length 0
02:19:01.551752 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 372:424, ack 685, win 65535, length 52
02:19:01.551879 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 424, win 27968, length 0
02:19:01.552571 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 685:769, ack 424, win 27968, length 84
02:19:01.553078 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 424:524, ack 769, win 65451, length 100
02:19:01.591500 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 524, win 27968, length 0
02:19:01.591739 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 524:576, ack 769, win 65451, length 52
02:19:01.591863 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 576, win 27968, length 0
02:19:01.598623 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 769:1301, ack 576, win 27968, length 532
02:19:01.599515 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 1301:1369, ack 576, win 27968, length 68
02:19:01.599755 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 1369, win 64851, length 0
02:19:02.559609 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 576:660, ack 1369, win 64851, length 84
02:19:02.591501 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 660, win 27968, length 0
02:19:02.591761 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 660:712, ack 1369, win 64851, length 52
02:19:02.591911 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 712, win 27968, length 0
02:19:02.592890 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 1369:1453, ack 712, win 27968, length 84
02:19:02.593398 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 712:812, ack 1453, win 64767, length 100
02:19:02.631527 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 812, win 27968, length 0
02:19:02.631767 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 812:864, ack 1453, win 64767, length 52
02:19:02.631894 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 864, win 27968, length 0
02:19:02.638525 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 1453:1985, ack 864, win 27968, length 532
02:19:02.639407 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 1985:2053, ack 864, win 27968, length 68
02:19:02.639650 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 2053, win 64167, length 0
02:19:02.951588 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 864:948, ack 2053, win 64167, length 84
02:19:02.991526 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 948, win 27968, length 0
02:19:02.991772 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 948:1000, ack 2053, win 64167, length 52
02:19:02.991901 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1000, win 27968, length 0
02:19:02.992597 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 2053:2137, ack 1000, win 27968, length 84
02:19:02.993106 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1000:1100, ack 2137, win 64083, length 100
02:19:03.031515 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1100, win 27968, length 0
02:19:03.031753 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1100:1152, ack 2137, win 64083, length 52
02:19:03.031878 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1152, win 27968, length 0
02:19:03.038521 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 2137:2669, ack 1152, win 27968, length 532
02:19:03.039439 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 2669:2737, ack 1152, win 27968, length 68
02:19:03.039678 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 2737, win 65535, length 0
02:19:03.143575 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1152:1236, ack 2737, win 65535, length 84
02:19:03.181516 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1236, win 27968, length 0
02:19:03.181767 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1236:1288, ack 2737, win 65535, length 52
02:19:03.181903 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1288, win 27968, length 0
02:19:03.182588 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 2737:2821, ack 1288, win 27968, length 84
02:19:03.183083 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1288:1388, ack 2821, win 65451, length 100
02:19:03.221522 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1388, win 27968, length 0
02:19:03.221758 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1388:1440, ack 2821, win 65451, length 52
02:19:03.221882 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1440, win 27968, length 0
02:19:03.228171 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 2821:3353, ack 1440, win 27968, length 532
02:19:03.229060 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 3353:3421, ack 1440, win 27968, length 68
02:19:03.229300 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 3421, win 64851, length 0
02:19:03.343572 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1440:1524, ack 3421, win 64851, length 84
02:19:03.381537 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1524, win 27968, length 0
02:19:03.381782 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1524:1576, ack 3421, win 64851, length 52
02:19:03.381916 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1576, win 27968, length 0
02:19:03.382599 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 3421:3505, ack 1576, win 27968, length 84
02:19:03.383203 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1576:1676, ack 3505, win 64767, length 100
02:19:03.421514 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1676, win 27968, length 0
02:19:03.421753 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1676:1728, ack 3505, win 64767, length 52
02:19:03.422019 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1728, win 27968, length 0
02:19:03.428292 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 3505:4037, ack 1728, win 27968, length 532
02:19:03.429174 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 4037:4105, ack 1728, win 27968, length 68
02:19:03.429415 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 4105, win 64167, length 0
02:19:03.535688 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1728:1812, ack 4105, win 64167, length 84
02:19:03.571521 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1812, win 27968, length 0
02:19:03.571768 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1812:1864, ack 4105, win 64167, length 52
02:19:03.572037 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1864, win 27968, length 0
02:19:03.572675 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 4105:4189, ack 1864, win 27968, length 84
02:19:03.573187 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1864:1964, ack 4189, win 64083, length 100
02:19:03.611520 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 1964, win 27968, length 0
02:19:03.611791 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 1964:2016, ack 4189, win 64083, length 52
02:19:03.612172 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2016, win 27968, length 0
02:19:03.620405 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 4189:4721, ack 2016, win 27968, length 532
02:19:03.621290 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 4721:4789, ack 2016, win 27968, length 68
02:19:03.621532 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 4789, win 65535, length 0
02:19:03.727596 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2016:2100, ack 4789, win 65535, length 84
02:19:03.728127 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 4789:4841, ack 2100, win 27968, length 52
02:19:03.728381 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2100:2152, ack 4841, win 65483, length 52
02:19:03.729107 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 4841:4925, ack 2152, win 27968, length 84
02:19:03.729598 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2152:2252, ack 4925, win 65399, length 100
02:19:03.761519 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2252, win 27968, length 0
02:19:03.761756 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2252:2304, ack 4925, win 65399, length 52
02:19:03.762021 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2304, win 27968, length 0
02:19:03.769106 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 4925:5457, ack 2304, win 27968, length 532
02:19:03.770100 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 5457:5525, ack 2304, win 27968, length 68
02:19:03.770339 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 5525, win 64799, length 0
02:19:03.911688 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2304:2388, ack 5525, win 64799, length 84
02:19:03.951512 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2388, win 27968, length 0
02:19:03.951751 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2388:2440, ack 5525, win 64799, length 52
02:19:03.952017 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2440, win 27968, length 0
02:19:03.952654 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 5525:5609, ack 2440, win 27968, length 84
02:19:03.953155 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2440:2540, ack 5609, win 64715, length 100
02:19:03.991520 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2540, win 27968, length 0
02:19:03.991760 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2540:2592, ack 5609, win 64715, length 52
02:19:03.992029 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2592, win 27968, length 0
02:19:03.998638 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 5609:6141, ack 2592, win 27968, length 532
02:19:03.999524 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 6141:6209, ack 2592, win 27968, length 68
02:19:03.999768 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 6209, win 64115, length 0
02:19:04.087650 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2592:2676, ack 6209, win 64115, length 84
02:19:04.121516 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2676, win 27968, length 0
02:19:04.121763 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2676:2728, ack 6209, win 64115, length 52
02:19:04.122032 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2728, win 27968, length 0
02:19:04.122669 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 6209:6293, ack 2728, win 27968, length 84
02:19:04.123168 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2728:2828, ack 6293, win 65535, length 100
02:19:04.161519 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2828, win 27968, length 0
02:19:04.161752 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2828:2880, ack 6293, win 65535, length 52
02:19:04.162133 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2880, win 27968, length 0
02:19:04.168604 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 6293:6825, ack 2880, win 27968, length 532
02:19:04.169960 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 6825:6893, ack 2880, win 27968, length 68
02:19:04.170192 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 6893, win 64935, length 0
02:19:04.263611 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2880:2964, ack 6893, win 64935, length 84
02:19:04.301518 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 2964, win 27968, length 0
02:19:04.301758 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 2964:3016, ack 6893, win 64935, length 52
02:19:04.302018 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 3016, win 27968, length 0
02:19:04.302653 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 6893:6977, ack 3016, win 27968, length 84
02:19:04.303147 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 3016:3116, ack 6977, win 64851, length 100
02:19:04.341520 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 3116, win 27968, length 0
02:19:04.341757 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 3116:3168, ack 6977, win 64851, length 52
02:19:04.342023 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 3168, win 27968, length 0
02:19:04.348276 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 6977:7509, ack 3168, win 27968, length 532
02:19:04.349164 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 7509:7577, ack 3168, win 27968, length 68
02:19:04.349406 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 7577, win 64251, length 0
02:19:04.439625 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 3168:3252, ack 7577, win 64251, length 84
02:19:04.471545 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 3252, win 27968, length 0
02:19:04.471841 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 3252:3304, ack 7577, win 64251, length 52
02:19:04.472112 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 3304, win 27968, length 0
02:19:04.472745 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 7577:7661, ack 3304, win 27968, length 84
02:19:04.473565 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 3304:3404, ack 7661, win 64167, length 100
02:19:04.511518 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 3404, win 27968, length 0
02:19:04.511826 IP admin.lan.3615 > dw.lan.22022: Flags [P.], seq 3404:3456, ack 7661, win 64167, length 52
02:19:04.512197 IP dw.lan.22022 > admin.lan.3615: Flags [.], ack 3456, win 27968, length 0
02:19:04.519663 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 7661:8193, ack 3456, win 27968, length 532
02:19:04.520554 IP dw.lan.22022 > admin.lan.3615: Flags [P.], seq 8193:8261, ack 3456, win 27968, length 68
02:19:04.520806 IP admin.lan.3615 > dw.lan.22022: Flags [.], ack 8261, win 65535, length 0
02:19:11.889864 IP admin.lan.3408 > dw.lan.22022: Flags [P.], seq 1:53, ack 392, win 64743, length 52