Прошил, но в решении проблемы это не помогло. Периодически отваливается свисток ZTE MF 831 от Билайн с симкой от Мегафон. На стабильной прошивке (и на бетке тоже) пробовал подключать свисток в режиме модема, но маршрутизатор тогда его не определяет. Так же пробовал подключать блок питания на 2А, тоже мимо. Помогает во время разрыва или перезагружать маршрутизатор или отключать и подключать свисток через "Настройки USB".
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# TL-WR842N System Log
# Time = 2016-01-01 0:18:25 1107s
# H-Ver = WR842N v3 00000000 (BETA) : S-Ver = 3.16.9 Build 161229 Rel.37184n (BETA)
# L = 192.168.0.1 : M = 255.255.255.0
# 3G/4G : 3G/4G = 192.168.8.153 : M = 255.255.255.0 : G = 192.168.8.153
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1st day 00:00:12 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 0
1st day 00:00:12 DHCP NOTICE DHCP server started
1st day 00:00:12 SECURITY INFO PPTP Passthrough enabled
1st day 00:00:12 SECURITY INFO L2TP Passthrough enabled
1st day 00:00:12 SECURITY INFO IPSEC Passthrough enabled
1st day 00:00:12 SECURITY INFO FTP ALG enabled
1st day 00:00:12 SECURITY INFO TFTP ALG enabled
1st day 00:00:12 SECURITY INFO H323 ALG enabled
1st day 00:00:12 SECURITY INFO RTSP ALG enabled
1st day 00:00:12 DHCP INFO dhcpc_ipc_data_rcv_router 856 : current network type = 0
1st day 00:00:13 SECURITY INFO SIP ALG enabled
1st day 00:00:14 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 0
1st day 00:00:16 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 0
1st day 00:00:20 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 1
1st day 00:00:22 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 1
1st day 00:00:24 DHCP INFO DHCPC DHCP Service unavailable, recv no OFFER
1st day 00:00:24 DHCP INFO dhcpc_ipc_data_rcv_router 856 : current network type = 0
1st day 00:00:34 OTHER NOTICE Clear the USB PORT
1st day 00:00:34 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 0
1st day 00:00:36 OTHER INFO System Initialize Finished.
1st day 00:00:36 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 0
1st day 00:00:38 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 0
1st day 00:00:40 3G/4G INFO handle_card start
1st day 00:00:40 3G/4G INFO In process_msg, LTE Modem = 0, modemStatus = 1, targetVendorID = 0x0000, targerProductID = 0x0000
1st day 00:00:42 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 1
1st day 00:00:44 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 1
1st day 00:00:46 DHCP INFO DHCPC DHCP Service unavailable, recv no OFFER
1st day 00:00:47 DHCP INFO dhcpc_ipc_data_rcv_router 856 : current network type = 0
1st day 00:00:55 3G/4G INFO Before Mode switch VendorID = 0x19d2, ProductID = 0x1403
1st day 00:00:55 3G/4G INFO =>
1st day 00:00:55 3G/4G INFO =>T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
1st day 00:00:55 3G/4G INFO =>B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
1st day 00:00:55 3G/4G INFO =>D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
1st day 00:00:55 3G/4G INFO =>P: Vendor=1d6b ProdID=0002 Rev= 2.06
1st day 00:00:55 3G/4G INFO =>S: Manufacturer=Linux 2.6.31 ehci_hcd
1st day 00:00:55 3G/4G INFO =>S: Product=ATH EHCI
1st day 00:00:55 3G/4G INFO =>S: SerialNumber=platform
1st day 00:00:55 3G/4G INFO =>C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
1st day 00:00:55 3G/4G INFO =>I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
1st day 00:00:55 3G/4G INFO =>E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms
1st day 00:00:55 3G/4G INFO =>
1st day 00:00:55 3G/4G INFO =>T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
1st day 00:00:55 3G/4G INFO =>D: Ver= 2.01 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
1st day 00:00:55 3G/4G INFO =>P: Vendor=19d2 ProdID=1403 Rev=f1.55
1st day 00:00:55 3G/4G INFO =>S: Manufacturer=ZTE,Incorporated
1st day 00:00:55 3G/4G INFO =>S: Product=ZTE Wireless Ethernet Adapter
1st day 00:00:55 3G/4G INFO =>S: SerialNumber=MF8310ZTED000000CP261718HNL0ZVY1TGG47X8_8_7D72&&&&&&&&&&&&&&&&&0
1st day 00:00:55 3G/4G INFO =>C:* #Ifs= 3 Cfg#= 1 Atr=a0 MxPwr=500mA
1st day 00:00:55 3G/4G INFO =>A: FirstIf#= 0 IfCount= 2 Cls=e0(wlcon) Sub=01 Prot=03
1st day 00:00:55 3G/4G INFO =>I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=ff Driver=(none)
1st day 00:00:55 3G/4G INFO =>E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl=32ms
1st day 00:00:55 3G/4G INFO =>I:* If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
1st day 00:00:55 3G/4G INFO =>E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
1st day 00:00:55 3G/4G INFO =>E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
1st day 00:00:55 3G/4G INFO =>I:* If#= 2 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
1st day 00:00:55 3G/4G INFO =>E: Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
1st day 00:00:55 3G/4G INFO =>E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=125us
1st day 00:00:55 3G/4G INFO Memory command entry match.
1st day 00:00:57 3G/4G INFO After mode switch vendorID is 0x19d2 productID is 0x1403
1st day 00:00:57 3G/4G INFO Before judgeModemTypeByTargetID, index = -1, targetPid = 0x1403
1st day 00:00:57 3G/4G INFO After judgeModemTypeByTargetID, modem type = 2
1st day 00:00:57 3G/4G INFO In process_msg, LTE Modem = 2, modemStatus = 2, targetVendorID = 0x19d2, targerProductID = 0x1403
1st day 00:00:57 3G/4G INFO insmod LTE modem drivers
1st day 00:00:57 3G/4G INFO primary device is not in
1st day 00:00:57 3G/4G INFO swSwitchNetWorkType 450 switch to 1
1st day 00:00:57 3G/4G INFO swSwitchToNetwork 378 Now try to switch to the network type: 1
1st day 00:00:57 3G/4G INFO change to the second link nw = 1
1st day 00:00:57 DHCP INFO DHCPC Entering released state
1st day 00:00:57 3G/4G INFO Clean page caches to free memory for LTE modem.
1st day 00:00:58 3G/4G INFO Not tty device, return.
1st day 00:00:58 3G/4G INFO connectToNetwork 124 disconnect is finished, begin to switch connect type.^M
1st day 00:01:01 3G/4G INFO Not tty device, return.
1st day 00:01:01 3G/4G INFO USB modem is ready
1st day 00:01:02 3G/4G INFO Start set modem ISP info automatically
1st day 00:01:02 3G/4G INFO modem index is 0
1st day 00:01:02 3G/4G INFO End set modem ISP info
1st day 00:01:04 3G/4G INFO Not tty device, return.
1st day 00:01:07 3G/4G INFO Not tty device, return.
1st day 00:01:10 3G/4G INFO Not tty device, return.
1st day 00:01:13 3G/4G INFO Not tty device, return.
1st day 00:01:16 3G/4G INFO Not tty device, return.
1st day 00:01:19 3G/4G INFO Not tty device, return.
1st day 00:01:21 3G/4G INFO mobileAutoDial 640 LTE dial automaticly
1st day 00:01:21 3G/4G INFO swLteMobileCmdReq 432 lteLinkStatus == 0, ifName == lte0
1st day 00:01:23 3G/4G NOTICE swLteMobileCmdReq 505 call dhcpcLteModemStart
1st day 00:01:23 3G/4G NOTICE swLteMobileCmdReq 512 Wan type is DHCP IP, kill the process first.
1st day 00:01:24 3G/4G NOTICE swLteMobileCmdReq<518>: calling dhcpcLteModemStart with lte0
1st day 00:01:24 DHCP INFO DHCPC Send DISCOVER with request ip 0 and unicast flag 0
1st day 00:01:24 DHCP INFO DHCPC Recv OFFER from server c0a80801 with ip c0a80899
1st day 00:01:24 DHCP INFO DHCPC Send REQUEST to server c0a80801 with request ip c0a80899
1st day 00:01:25 3G/4G INFO Not tty device, return.
1st day 00:01:25 DHCP INFO dhcpc_ipc_data_rcv_router 856 : current network type = 1
1st day 00:01:25 DHCP INFO dhcpc_ipc_data_rcv_lte 300 lte_net_info.status = 0x1 lte_net_info.ip = 0x0, lte_net_info.mask = 0x0, lte_net_info.gw = 0x0
1st day 00:01:25 DHCP INFO DHCPC Recv ACK from server c0a80801 with ip c0a80899 lease time 86400
1st day 00:01:25 DHCP INFO DHCPC:GET ip:c0a80899 mask:ffffff00 gateway:c0a80801 dns1:c0a80801 dns2:0 static route:0
1st day 00:01:25 DHCP INFO Mark the ip c0a80899 for option 50.
1st day 00:01:26 DHCP INFO dhcpc_ipc_data_rcv_router 856 : current network type = 1
1st day 00:01:26 DHCP INFO dhcpc_ipc_data_rcv_lte 300 lte_net_info.status = 0x0 lte_net_info.ip = 0xc0a80899, lte_net_info.mask = 0xffffff00, lte_net_info.gw = 0xc0a80801
1st day 00:01:26 DHCP INFO dhcpc_ipc_data_rcv_lte 359 dhcpstr.ip = 192.168.8.1
1st day 00:01:26 DHCP INFO Update DNS1 = 0xc0a80801, DNS2=0x0
1st day 00:01:28 3G/4G INFO Not tty device, return.
1st day 00:01:28 DHCP WARNING dhcpc_ipc_data_rcv_lte 409
1st day 00:01:28 DHCP INFO LTE Network connected.
1st day 00:01:28 3G/4G INFO Modem information is updated
1st day 00:03:47 DHCP INFO DHCPS:Recv REQUEST from 44:91:DB:A5:F6:D5
1st day 00:03:47 DHCP INFO DHCPS:Send ACK to 192.168.0.102
1st day 00:04:34 3G/4G INFO Not tty device, return.
1st day 00:04:49 3G/4G INFO Not tty device, return.
1st day 00:07:13 3G/4G INFO Not tty device, return.
1st day 00:07:34 3G/4G INFO Not tty device, return.
1st day 00:07:55 3G/4G INFO Not tty device, return.
1st day 00:08:16 3G/4G INFO Not tty device, return.
1st day 00:08:37 3G/4G INFO Not tty device, return.
1st day 00:08:59 3G/4G INFO Not tty device, return.
1st day 00:09:20 3G/4G INFO Not tty device, return.
1st day 00:09:41 3G/4G INFO Not tty device, return.
1st day 00:10:02 3G/4G INFO Not tty device, return.
1st day 00:10:23 3G/4G INFO Not tty device, return.
1st day 00:10:44 3G/4G INFO Not tty device, return.
1st day 00:11:05 3G/4G INFO Not tty device, return.
1st day 00:11:26 3G/4G INFO Not tty device, return.
1st day 00:11:47 3G/4G INFO Not tty device, return.