USB 3g modem NDIS mode problem

[Dmitry Fedoseev]

I have Huawei E352 modem switched into NDIS mode:

iface wwan0 inet dhcp
        pre-up          /bin/echo -en 'AT^NDISDUP=1,1,"internet"\r\n' > /dev/ttyUSB0
        post-down       /bin/echo -en 'AT^NDISDUP=1,0\r\n' > /dev/ttyUSB0

root@orangepione-0:~# ip link show dev wwan0
5: wwan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
    link/ether 02:50:f3:00:00:00 brd ff:ff:ff:ff:ff:ff

I works:

root@orangepione-0:~# ifup wwan0 
Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/wwan0/02:50:f3:00:00:00
Sending on   LPF/wwan0/02:50:f3:00:00:00
Sending on   Socket/fallback
DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 6
DHCPREQUEST on wwan0 to 255.255.255.255 port 67
DHCPOFFER from 100.69.222.113
DHCPACK from 100.69.222.113
bound to 100.69.222.116 -- renewal in 2978 seconds.

but I can not ping anything:

root@orangepione-0:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
28 packets transmitted, 0 received, 100% packet loss, time 27003ms

but I can see the trafic:

root@orangepione-0:~# tcpdump -n -i wwan0 icmp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on wwan0, link-type EN10MB (Ethernet), capture size 262144 bytes
17:12:10.868491 IP 100.69.222.116 > 8.8.8.8: ICMP echo request, id 984, seq 11, length 64
17:12:11.235952 IP 8.8.8.8 > 100.69.222.116: ICMP echo reply, id 984, seq 11, length 64
17:12:11.868462 IP 100.69.222.116 > 8.8.8.8: ICMP echo request, id 984, seq 12, length 64
17:12:12.207080 IP 8.8.8.8 > 100.69.222.116: ICMP echo reply, id 984, seq 12, length 64

On Debian Jessie same configuration works perfectly. Which Armbian specific points I miss? Where is trafic lost or blocked?