解决ubuntu 12.04无线速度慢的问题

最近折腾下ubuntu12.04，发现采用无线wifi方式速度超级慢，如下，

flowing@flowing-pc:~$ sudo ping sina.com.cn
[sudo] password for flowing:
PING sina.com.cn (202.108.33.60) 56(84) bytes of data.
64 bytes from 202.108.33.60: icmp_req=1 ttl=245 time=3.69 ms
64 bytes from 202.108.33.60: icmp_req=2 ttl=245 time=4.85 ms
64 bytes from 202.108.33.60: icmp_req=3 ttl=245 time=5.12 ms
64 bytes from 202.108.33.60: icmp_req=4 ttl=245 time=7.37 ms
64 bytes from 202.108.33.60: icmp_req=5 ttl=245 time=10.7 ms
64 bytes from 202.108.33.60: icmp_req=6 ttl=245 time=5.27 ms
^Z
[1]+  已停止               sudo ping sina.com.cn
flowing@flowing-pc:~$

查找了网上的一些资料，大多数是说需要关闭IPV6的功能及配置网卡，按照所说的方式修改了系统配置，问题仍然没有解决，郁闷至极！

家里无线路由采用的是WAP2加密方式，到无线网关延迟非常大，后将无线路由配置为WEP方式加密，结果改完重新连接，OK！

flowing@flowing-pc:~$ sudo ping sina.com.cn
PING sina.com.cn (202.108.33.60) 56(84) bytes of data.
64 bytes from 202.108.33.60: icmp_req=1 ttl=245 time=2.29 ms
64 bytes from 202.108.33.60: icmp_req=2 ttl=245 time=2.50 ms
64 bytes from 202.108.33.60: icmp_req=3 ttl=245 time=2.67 ms
64 bytes from 202.108.33.60: icmp_req=4 ttl=245 time=2.31 ms
64 bytes from 202.108.33.60: icmp_req=5 ttl=245 time=2.38 ms
^Z
[3]+  已停止               sudo ping sina.com.cn