除了投诉之外，怎么才能更有效地阻止联通的劫持呢？最近深受联通的广告劫持困扰，一开始是在页面的左下角弹出虚假广告，这直接导致G-zip压缩的页面变成下载、页面内的javascript失效或-ttps连接中断，必须重新-新才可访问。现在劫持手段变成一个jsp程序了，即劫持到一个他专门的广告页面上，等待几秒之后再跳转到原来的页面上，这使得需要提交表格信息的页面提交失败，十分的耗时。已知这不是电脑-引起的，因为包括iPad和iP-one通过safari访问-ttp协议的网站都会出现这种情况。查询网页源代码，劫持的页面所在的服务器位于221.204.213.27而对于221.204.213.27这个-来看，查询WHOIS信息如下WHOIS Results for：221.204.213.27% [w-ois.apnic.net node-4]% W-ois data copyrig-t terms apnic.net/db/dbcopy...inetnum: 221.204.0.0 - 221.205.255.255netname: UNICOM-SXdescr: C-ina Unicom S-anxi Province Networkdescr: C-ina Unicomcountry: CNadmin-c: CH1302-APtec--c: XH63-APre-rks: service providermnt-by: APNIC-HMmnt-lower: MAINT-CNCGROUP-SXmnt-routes: MAINT-CNCGROUP-RRstatus: ALLOCATED PORTABLEre-rks: T-is object can only be modified by APNIC -ost-sterre-rks: If you wis- to modify t-is object details pleasere-rks: send e-il to -ost-ster@apnic.net wit- your organisationre-rks: account name in t-e subject line.c-anged: -m-c-anged@apnic.net 20030702c-anged: -m-c-anged@apnic.net 20060124c-anged: -m-c-anged@apnic.net 20090508source: APNICroute: 221.204.0.0/15descr: CNC Group CHINA169 S-anxi Province Networkcountry: CNorigin: AS4837mnt-by: MAINT-CNCGROUP-RRc-anged: abuse@cnc-noc.net 20060118source: APNICperson: C-inaUnicom Host-sternic--dl: CH1302-APe--il: abuse@c-inaunicom.cnaddress: No.21,Jin-Rong Streetaddress: Beijing,100140address: P.R.C-inap-one: 86-10-66259940fax-no: 86-10-662597-country: CNc-anged: abuse@c-inaunicom.cn 20090408mnt-by: MAINT-CNCGROUPsource: APNICperson: xue-ong -anaddress: BingZ-ou Nort- Road YouDian Front Street NO.2 S-anXi Data Communciation Bureau TaiYuan S-anXi C-inacountry: CNp-one: 86-351-4091749fax-no: 86-351-4088347e--il: -x-@public.ty.sx.cnnic--dl: XH63-APmnt-by: MAINT-CHINANET-SXc-anged: -x-@public.ty.sx.cn 20010208source: APNIC可以得出221.204.213.27这个-地址是属于联通旗下的。所以请求网络专家支招，如何避免劫持，怎么把被劫持的页面劫持回来。1 个答案
答案 1：
换个DNS试试， OpenDNS:208.67.222.222和208.67.220.220, Google: 8.8.8.8, 8.8.4.4