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旧 Mar 15th, 2012, 18:06     #1
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默认 又有新问题了

什么原因?
见图。刷过n变都一样,从公司的internet出去的。
从shaw出去的就没问题。
注意URL, 进某个人的博客,css就没了。
刚开始,胡咯同事,说薄熙来太火了,网站反映不过来了。

http://www.chinasmile.net/forums/attachment.php?attachmentid=61227&stc=1&d=1331849008


http://www.chinasmile.net/forums/attachment.php?attachmentid=61228&stc=1&d=1331848991


http://www.chinasmile.net/forums/attachment.php?attachmentid=61229&stc=1&d=1331848991
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旧 Mar 15th, 2012, 18:28   只看该作者   #2
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默认

你有公司内部有proxy server或其他content filtering的server过滤网页吗?

http://i377.photobucket.com/albums/oo214/davidatcanada/cc.jpg
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旧 Mar 15th, 2012, 18:58   只看该作者   #3
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默认

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你有公司内部有proxy server或其他content filtering的server过滤网页吗?
正解 上周被我配坏的MS Forefront就是这样。
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旧 Mar 15th, 2012, 21:18   只看该作者   #4
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默认

公司过滤了好像。
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旧 Mar 15th, 2012, 21:43   只看该作者   #5
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默认

估计是dns server不能解析sina域名
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旧 Mar 15th, 2012, 23:38   只看该作者   #6
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默认

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正解 上周被我配坏的MS Forefront就是这样。
能详细点吗?
据反映上周就发生了。这周一我的DNS里的zone被误删了(以为两套dns,不会有问题的;天也升温,脑子有点蒙)。之后手动很快就把zone又建回来了,固定的host就几个,当时发现不对马上就把zone里的记录截了个图。应该和这个事没联系吧。
TRACEROUTE sina和yahoo,出了我的gateway后都只显示了两个ip,后面就timeout了。email到网络部,说没做任何设置改动。
首先想确定:不是我自己dns上的问题吧。先的确定自己没问题,才能继续找网络的人。

自己没设什么过滤。都是同一域名下的网页,要过滤都过滤了。没见过只过滤css样式的。

只有sina.com.cn有这个问题,其他网站都没问题,tianya,hao123,msn

明再找个域外的机子试一下。
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旧 Mar 16th, 2012, 00:40   只看该作者   #7
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默认

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能详细点吗?
据反映上周就发生了。这周一我的DNS里的zone被误删了(以为两套dns,不会有问题的;天也升温,脑子有点蒙)。之后手动很快就把zone又建回来了,固定的host就几个,当时发现不对马上就把zone里的记录截了个图。应该和这个事没联系吧。
TRACEROUTE sina和yahoo,出...
分段测试。
接在你们公司第一个路由器下试试是否能连上,记得DNS用外网的ISP的。
然后逐步内推,看到哪里出问题。
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旧 Mar 16th, 2012, 08:44   只看该作者   #8
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默认

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能详细点吗?
据反映上周就发生了。这周一我的DNS里的zone被误删了(以为两套dns,不会有问题的;天也升温,脑子有点蒙)。之后手动很快就把zone又建回来了,固定的host就几个,当时发现不对马上就把zone里的记录截了个图。应该和这个事没联系吧。
TRACEROUTE sina和yahoo,出...
一个网页很可能分布在很多个服务器上,用不同的IP,甚至距离很远的网段。我当时的问题是forefront的网段设置引起的,一个放css的服务器IP竟然在我的内网网段里,好像那个有问题的网段是forefront缺省设置加进去的,看似普通内网的网址,实际是外网的。

也有可能是dns问题。国内劫持dns,replication因此也可能非常混乱,导致部分ISP的dns不能正确解析国内的ip。既然shaw没问题,试试用shaw的dns解析。

此帖于 Mar 16th, 2012 09:19 被 懒人懒 编辑。
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旧 Mar 16th, 2012, 13:44   只看该作者   #9
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默认

问题来了。domain之外的都没问题,只有自己域内的机子不行。没装forefront,装的是trendmicro。
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旧 Mar 16th, 2012, 14:40   只看该作者   #10
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问题来了。domain之外的都没问题,只有自己域内的机子不行。没装forefront,装的是trendmicro。
trendmicro的什么产品?web security server? 还是officescan client?
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旧 Mar 16th, 2012, 15:24   只看该作者   #11
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trendmicro的什么产品?web security server? 还是officescan client?
officescan.
问题解决了。一个CCIE小兄弟刚好打了个电话进来。把自己dns的forward指导8.8.8.8就好了。但还是没弄懂为什么css的样式出不来?没什么大部分能解析,只有个别的不行?
正规的forward应该指导哪?我的上一级还是其他的?
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旧 Mar 16th, 2012, 17:43   只看该作者   #12
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officescan.
问题解决了。一个CCIE小兄弟刚好打了个电话进来。把自己dns的forward指导8.8.8.8就好了。但还是没弄懂为什么css的样式出不来?没什么大部分能解析,只有个别的不行?
正规的forward应该指导哪?我的上一级还是其他的?
8.8.8.8和4.2.2.2都是google的dns server,通常你的fowarder应该指到你ISP的dns server上。
我原来觉得也许和你的officescan有关,因为新的officescan client有web reputation的服务,如果你没有设置过的话,default不管在内网和外网这个服务都会通过trendmicro的internet上的web reputation server检查每一个客户的web request,也许网页里内嵌的某些内容被它过滤掉了,在你的local 的officescan server的log里应该可以看得到哪些block了。通常应该在officescan server设一个相关的alert email。
不过你说改了dns就好了,也许确实是你原来dns server的问题。css可能调用不同网址的内容,而你原来的dns server解析有问题。
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旧 Mar 16th, 2012, 20:25   只看该作者   #13
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以后这种问题直接交给network guy好了,15分钟处理不了让老板换人。
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旧 Mar 16th, 2012, 20:54   只看该作者   #14
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officescan.
问题解决了。一个CCIE小兄弟刚好打了个电话进来。把自己dns的forward指导8.8.8.8就好了。但还是没弄懂为什么css的样式出不来?没什么大部分能解析,只有个别的不行?
正规的forward应该指导哪?我的上一级还是其他的?
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一个网页很可能分布在很多个服务器上,用不同的IP,甚至距离很远的网段。我当时的问题是forefront的网段设置引起的,一个放css的服务器IP竟然在我的内网网段里,好像那个有问题的网段是forefront缺省设置加进去的,看似普通内网的网址,实际是外网的。

也有可能是dns问题。国内劫持dns,replication因此也可能非常混乱,导致部分ISP的dns不能正确解析国内的ip。既然shaw没问题,试试用shaw的dns解析。
肯定没认真看我的帖子,我已经告诉你问题出在哪里了,而且原因是什么。打PP
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opensource (Mar 16th, 2012)
旧 Mar 16th, 2012, 21:01   只看该作者   #15
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默认

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以后这种问题直接交给network guy好了,15分钟处理不了让老板换人。
这种问题不一定是网络问题,还有上面在讨论的security gateway,甚至客户机上装的网络安全软件引起的。浏览器的缓存出错,也会出这种问题。还有感染malware、木马,客户机上装挡广告的软件,甚至有些网站对某些浏览器的支持不好都可能。

照你这么说,不出一个星期,所有人都被开掉了。
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旧 Mar 16th, 2012, 22:18   只看该作者   #16
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默认

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作者: 懒人懒 查看帖子
这种问题不一定是网络问题,还有上面在讨论的security gateway,甚至客户机上装的网络安全软件引起的。浏览器的缓存出错,也会出这种问题。还有感染malware、木马,客户机上装挡广告的软件,甚至有些网站对某些浏览器的支持不好都可能。

照你这么说,不出一个星期,所有人都被开掉了。
这种问题可能不是网络问题,但让网络组的人开始troubshooting肯定会比server guy,要是我,第一时间做的就是nslookup,然后是tracert,接着是Telnet port 80,做完这些都过来,才跟网络没关系,但问题不是已经很清楚了吗?
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旧 Mar 16th, 2012, 22:42   只看该作者   #17
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默认

完全不是网络部的问题,我自己的dns问题。

在 dc1的forward tab里,当时“user root hints if no forwarders are available" 是checked的。按照以前mcse说的,我的dns去找顶级域root,root一级一级往下找。我的绝大部分域名解析没问题,cnn, yahoo,sina北美。只有中国sina不行。说明在解析中国sina时超时。 (问什么sina会超时,而一些小网站到没事?)
理论上,root hints是没问题,所以没填forward,dns基本工作正常。实际工作中大家都填isp的dns ip, 或者google的dns ip。还有人建议不要填isp的,因为有的isp很操蛋;只填google的。

现在好像回想起一点了,1年多前,切换ISP,自己的dns forward好像指向的是自己,OLD-DC1.(network guy给填的)。现在出问题,就是因为没填forward。
现在还没要到isp dns的ip,都发了3次信了,算了也不想用他的了。 networkguy应该背的住自己dns的ip把!?
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旧 Mar 16th, 2012, 22:44   只看该作者   #18
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默认

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作者: wdqin 查看帖子
这种问题可能不是网络问题,但让网络组的人开始troubshooting肯定会比server guy,要是我,第一时间做的就是nslookup,然后是tracert,接着是Telnet port 80,做完这些都过来,才跟网络没关系,但问题不是已经很清楚了吗?
network guy 把ping都禁用了,我只能ping自己的gateway
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旧 Mar 16th, 2012, 22:55   只看该作者   #19
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默认

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作者: 懒人懒 查看帖子
肯定没认真看我的帖子,我已经告诉你问题出在哪里了,而且原因是什么。打PP
sorry,真没注意仔细看。国内劫持dns,replication因此也可能非常混乱,导致部分ISP的dns不能正确解析国内的ip
国内的dns权威解析是谁?没准哪天google也挂了。很多年没做运维了,多谅解。
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旧 Mar 17th, 2012, 00:21   只看该作者   #20
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默认

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作者: opensource 查看帖子
network guy 把ping都禁用了,我只能ping自己的gateway
所以你 才应该第一时间将问题给network。你连troubleshooting的手段都没有。
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