Здравствуйте!
Модем стабильно раз в 10 мин разрывает связь, после тестовой прошивки. Возврат к старой ничего не меняет.
Все лампочки горят как положенно
Лог
eb 7 19:52:15 daemon info pppd[586]: No response to 5 echo-requests
Feb 7 19:52:15 daemon notice pppd[586]: Serial link appears to be disconnected.
Feb 7 19:52:15 daemon info pppd[586]: Connect time 10.5 minutes.
Feb 7 19:52:15 daemon info pppd[586]: Sent 52800 bytes, received 113073 bytes.
Feb 7 19:52:15 daemon warn pppd[586]: Couldn't increase MRU to 1500
Feb 7 19:52:21 daemon crit pppd[586]: Connection terminated....
Feb 7 19:52:22 daemon notice pppd[586]: Modem hangup
Feb 7 19:52:25 daemon info pppd[586]: Sent PADT
Feb 7 19:52:28 daemon info pppd[586]: PPP session is 36139
Feb 7 19:52:28 daemon info pppd[586]: Using interface ppp0_0_33_1
Feb 7 19:52:28 daemon crit pppd[586]: Connect: ppp_0_0_33_1 <--> nas_0_0_33
Feb 7 19:52:28 daemon warn pppd[586]: Couldn't increase MRU to 1500
Feb 7 19:52:28 daemon notice pppd[586]: PAP authentication succeeded
Feb 7 19:52:28 daemon notice pppd[586]: peer from calling number B4:14:89:03:08:00 authorized
Feb 7 19:52:28 daemon notice pppd[586]: local IP address 93.127.109.61
Feb 7 19:52:28 daemon notice pppd[586]: remote IP address 195.248.176.150
Feb 7 19:52:28 daemon notice pppd[586]: primary DNS address 195.248.191.67
Feb 7 19:52:28 daemon notice pppd[586]: secondary DNS address 195.248.191.72
Feb 7 19:52:30 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=93.127.126.248 DST=93.127.109.61 LEN=52 TOS=0x00 PREC=0x00 TTL=126 ID=15353 DF PROTO=TCP SPT=20381 DPT=44976 WINDOW=8192 RES=0x00 SYN URGP=0
Feb 7 19:52:33 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=93.127.126.248 DST=93.127.109.61 LEN=52 TOS=0x00 PREC=0x00 TTL=126 ID=16200 DF PROTO=TCP SPT=20381 DPT=44976 WINDOW=8192 RES=0x00 SYN URGP=0
Feb 7 19:52:39 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=93.127.126.248 DST=93.127.109.61 LEN=48 TOS=0x00 PREC=0x00 TTL=126 ID=17613 DF PROTO=TCP SPT=20381 DPT=44976 WINDOW=8192 RES=0x00 SYN URGP=0
Feb 7 19:53:15 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=195.248.163.151 DST=93.127.109.61 LEN=52 TOS=0x00 PREC=0x00 TTL=125 ID=4489 DF PROTO=TCP SPT=53455 DPT=18725 WINDOW=8192 RES=0x00 SYN URGP=0
Feb 7 19:53:18 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=195.248.163.151 DST=93.127.109.61 LEN=52 TOS=0x00 PREC=0x00 TTL=125 ID=4540 DF PROTO=TCP SPT=53455 DPT=18725 WINDOW=8192 RES=0x00 SYN URGP=0
Feb 7 20:01:28 daemon info pppd[586]: No response to 5 echo-requests
Feb 7 20:01:28 daemon notice pppd[586]: Serial link appears to be disconnected.
Feb 7 20:01:28 daemon info pppd[586]: Connect time 9.0 minutes.
Feb 7 20:01:28 daemon info pppd[586]: Sent 51092 bytes, received 111778 bytes.
Feb 7 20:01:28 daemon warn pppd[586]: Couldn't increase MRU to 1500
Feb 7 20:01:34 daemon crit pppd[586]: Connection terminated....
Feb 7 20:01:34 daemon notice pppd[586]: Modem hangup
Feb 7 20:01:37 daemon info pppd[586]: Sent PADT
Feb 7 20:01:40 daemon info pppd[586]: PPP session is 36944
Feb 7 20:01:40 daemon info pppd[586]: Using interface ppp0_0_33_1
Feb 7 20:01:40 daemon crit pppd[586]: Connect: ppp_0_0_33_1 <--> nas_0_0_33
Feb 7 20:01:40 daemon warn pppd[586]: Couldn't increase MRU to 1500
Feb 7 20:01:40 daemon notice pppd[586]: PAP authentication succeeded
Feb 7 20:01:40 daemon notice pppd[586]: peer from calling number B4:14:89:03:08:00 authorized
Feb 7 20:01:40 daemon notice pppd[586]: local IP address 93.127.109.61
Feb 7 20:01:40 daemon notice pppd[586]: remote IP address 195.248.176.150
Feb 7 20:01:40 daemon notice pppd[586]: primary DNS address 195.248.191.67
Feb 7 20:01:40 daemon notice pppd[586]: secondary DNS address 195.248.191.72
Feb 7 20:02:31 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=65.15.37.114 DST=93.127.109.61 LEN=48 TOS=0x04 PREC=0x80 TTL=112 ID=65090 DF PROTO=TCP SPT=1391 DPT=445 WINDOW=65535 RES=0x00 SYN URGP=0
Feb 7 20:02:34 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=65.15.37.114 DST=93.127.109.61 LEN=48 TOS=0x04 PREC=0x80 TTL=112 ID=54 DF PROTO=TCP SPT=1391 DPT=445 WINDOW=65535 RES=0x00 SYN URGP=0
Feb 7 20:02:54 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=46.70.101.249 DST=93.127.109.61 LEN=52 TOS=0x04 PREC=0x80 TTL=113 ID=5076 DF PROTO=TCP SPT=19562 DPT=23806 WINDOW=8192 RES=0x00 SYN URGP=0
Feb 7 20:02:57 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=46.70.101.249 DST=93.127.109.61 LEN=52 TOS=0x04 PREC=0x80 TTL=113 ID=5383 DF PROTO=TCP SPT=19562 DPT=23806 WINDOW=8192 RES=0x00 SYN URGP=0
Feb 7 20:03:03 user alert kernel: Intrusion -> IN=ppp_0_0_33_1 OUT= MAC= SRC=46.70.101.249 DST=93.127.109.61 LEN=48 TOS=0x04 PREC=0x80 TTL=113 ID=5789 DF PROTO=TCP SPT=19562 DPT=23806 WINDOW=8192 RES=0x00 SYN URGP=0
Feb 7 20:13:10 daemon info pppd[586]: No response to 5 echo-requests
Feb 7 20:13:10 daemon notice pppd[586]: Serial link appears to be disconnected.
Feb 7 20:13:10 daemon info pppd[586]: Connect time 11.5 minutes.
Feb 7 20:13:10 daemon info pppd[586]: Sent 58258 bytes, received 109286 bytes.
Feb 7 20:13:10 daemon warn pppd[586]: Couldn't increase MRU to 1500
Feb 7 20:13:16 daemon crit pppd[586]: Connection terminated....
Feb 7 20:13:16 daemon notice pppd[586]: Modem hangup
Feb 7 20:13:19 daemon info pppd[586]: Sent PADT
Feb 7 20:13:22 daemon info pppd[586]: PPP session is 64702
Feb 7 20:13:22 daemon info pppd[586]: Using interface ppp0_0_33_1
Feb 7 20:13:22 daemon crit pppd[586]: Connect: ppp_0_0_33_1 <--> nas_0_0_33

Линия проверенна на другом модеме.

Исходя из лога, роутер не получает ответа на 5 эхо запросов и рвёт линк. В вебморде нельзя нигде увеличить количество LCP-провалов? И ещё в каком положении галка "Keep connection alive" или нечто похожее и QoS (Quality of service)?