iceweasel打不开网页了

[yangdawei.hit]

能ping通所有网站，但iceweasel就是打不开网页，期待大家帮助。

[yangdawei.hit]

刚插了下网线再上网，都正常了。现在看，是无线上网时才出现上述情况。

[yangdawei.hit]

sudo ifconfig -a
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 08:9e:01:89:a2:24 txqueuelen 1000 (Ethernet)
RX packets 273052 bytes 380894983 (363.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 232800 bytes 19181044 (18.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 3435 bytes 488877 (477.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3435 bytes 488877 (477.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.108 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::2ed0:5aff:feb2:10ca prefixlen 64 scopeid 0x20<link>
ether 2c:d0:5a:b2:10:ca txqueuelen 1000 (Ethernet)
RX packets 410 bytes 54196 (52.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 214 bytes 26612 (25.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0