linux 4g lte huawei E3372 嵌入式4g拨号

wdsjy1314

我使用的HUAWEI的E3372，3.10内核，联通sim卡，可虚拟出wwan0，但用udhcpc获取ip失败：
udhcpc -i wwan0
udhcpc (v1.16.1) started
Sending discover...
Sending discover...
Sending discover...
Sending discover...
Sending discover...
Sending discover...
...
抓包：
tcpdump -ni wwan0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on wwan0, link-type EN10MB (Ethernet), capture size 262144 bytes
23:06:48.787096 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 32:44:9a:07:db:32, length 548
23:06:48.787688 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 32:44:9a:07:db:32, length 548
23:07:11.828097 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 32:44:9a:07:db:32, length 548
23:07:11.828799 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 32:44:9a:07:db:32, length 548
...
使用AT指令，可获取到ip,gw,dns等值，但把这些值配置到wwan0上，也不能访问外网，
操作如下：
# microcom -t 5000 -s 115200 /dev/ttyUSB1
ATZ
OK
AT^NDISDUP=1,1,"3gnet"
OK

^NDISSTAT:1,,,"IPV4"
# microcom -t 5000 -s 115200 /dev/ttyUSB1
AT^DHCP?
^DHCP: 84771C0A,F8FFFFFF,81771C0A,81771C0A,7B7B7B7B,7C7B7B7B,150000000,150000000

OK
翻译为：
ip:       84771C0A,（10.28.119.132）
mask:F8FFFFFF, (255.255.255.248)
gw :    81771C0A,（10.28.119.129）
dhcpserver: 81771C0A,（10.28.119.129）
dns:    7B7B7B7B,(123.123.123.123)
dns:    7C7B7B7B,(123.123.123.124)
max_tx: 150000000bps
max_rx: 150000000bps

# ifconfig wwan0 10.28.119.132 netmask 255.255.255.248
# route add default gw 10.28.119.129
#
# vi /etc/resolv.conf

nameserver 123.123.123.123
nameserver 123.123.123.124

ping www.baidu.com
一直没有反应
抓包：
tcpdump -ni wwan0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on wwan0, link-type EN10MB (Ethernet), capture size 262144 bytes
23:27:48.868715 ARP, Request who-has 10.28.119.129 tell 10.28.119.132, length 28
23:27:48.869187 ARP, Request who-has 10.28.119.129 tell 10.28.119.132, length 28
23:27:49.870131 ARP, Request who-has 10.28.119.129 tell 10.28.119.132, length 28
23:27:49.870542 ARP, Request who-has 10.28.119.129 tell 10.28.119.132, length 28
23:27:50.872114 ARP, Request who-has 10.28.119.129 tell 10.28.119.132, length 28

谁能帮帮小弟，跪谢！！