Właśnie podłączyłem modem E3372 (HiLink) do routera MR-3420V2 (HUB Logilink UA0085)

Gargoyle PL 1.6.0.5 (bb2b1ed)                                |
| OpenWrt Attitude Adjustment 12.09.1 (r40431)                 |
| Build time: 2014-04-11 12:35 CEST                            |
|                                                              |
| Cezary Jackiewicz (obsy), http://eko.one.pl                  |
|                                                              |
----------------------------------------------------------------
| Machine: TP-Link TL-MR3420 v2                                |
| Uptime: 0d, 00:32:24                                         |
| Load: 0.08 0.05 0.05                                         |
| Flash: total: 320KB, free: 56KB, used: 83%                   |
| Memory: total: 28.5MB, free: 14.5MB, used: 49%               |
| WAN: 192.168.8.100, proto: dhcp                              |
| LAN: 192.168.2.1                                             |
| WLAN: mode: ap, ssid: Rezerwa, channel: 10, conn: 1     

root@Gargoyle:~# uci show network
network.loopback=interface
network.loopback.ifname=lo
network.loopback.proto=static
network.loopback.ipaddr=127.0.0.1
network.loopback.netmask=255.0.0.0
network.lan=interface
network.lan.ifname=eth1
network.lan.type=bridge
network.lan.proto=static
network.lan.netmask=255.255.255.0
network.lan.ipaddr=192.168.2.1
network.lan.dns=192.168.2.1
network.wan=interface
network.wan.auto=1
network.wan.proto=dhcp
network.wan.ifname=eth2
network.@switch[0]=switch
network.@switch[0].name=switch0
network.@switch[0].reset=1
network.@switch[0].enable_vlan=1
network.@switch_vlan[0]=switch_vlan
network.@switch_vlan[0].device=switch0
network.@switch_vlan[0].vlan=1
network.@switch_vlan[0].ports=0 1 2 3 4

root@Gargoyle:~# cat /sys/kernel/debug/usb/devices

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  2, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 3.03
S:  Manufacturer=Linux 3.3.8 ehci_hcd
S:  Product=Generic Platform EHCI Controller
S:  SerialNumber=ehci-platform
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480  MxCh= 4
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1a40 ProdID=0101 Rev= 1.11
S:  Product=USB 2.0 Hub
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   1 Ivl=256ms

T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#=  4 Spd=480  MxCh= 0
D:  Ver= 2.10 Cls=02(comm.) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=12d1 ProdID=14dc Rev= 1.02
S:  Manufacturer=HUAWEI_MOBILE
S:  Product=HUAWEI_MOBILE
C:* #Ifs= 3 Cfg#= 1 Atr=c0 MxPwr=  2mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=06 Prot=00 Driver=cdc_ether
E:  Ad=83(I) Atr=03(Int.) MxPS=  16 Ivl=2ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=06 Prot=00 Driver=cdc_ether
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=125us

Konfiguracja:
Internet / WAN
Połączenie:DHCP (kablowe)
Interfejs WAN:eth2
Aktualne IP:192.168.8.100
Bieżąca dzierżawa wygasa: 2014-09-10 17:41 CEST

Wnioski:
działa bez problemu