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原帖由 aries215 于 2009-5-11 06:27 发表
谢谢关注!
我这里还是Ping不通221.5.88.88的,只有“time out"。
郁闷。
[qingping@wqpbsd ~]$ /sbin/ping 221.5.88.88
PING 221.5.88.88 (221.5.88.88): 56 data bytes
64 bytes from 221.5.88.88: icmp_seq=0 ttl=236 time=44.543 ms
64 bytes from 221.5.88.88: icmp_seq=1 ttl=236 time=44.521 ms
64 bytes from 221.5.88.88: icmp_seq=2 ttl=236 time=44.486 ms
64 bytes from 221.5.88.88: icmp_seq=3 ttl=236 time=44.512 ms
64 bytes from 221.5.88.88: icmp_seq=4 ttl=236 time=44.535 ms
64 bytes from 221.5.88.88: icmp_seq=5 ttl=236 time=44.518 ms
64 bytes from 221.5.88.88: icmp_seq=6 ttl=236 time=44.536 ms
^C
--- 221.5.88.88 ping statistics ---
7 packets transmitted, 7 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 44.486/44.522/44.543/0.018 ms
[qingping@wqpbsd ~]$
我的PC机是有公网地址的,你再给几个DNS服务器地址我给你ping一ping
我觉得你的问题不是DNS不通的问题,问题肯定是在网络层。
你可以先撇开DNS的问题不和运营商探讨,你先搞定IP层。你要DNS Server地址干嘛?不就是想让DNS Server返回一个name->IP的映射嘛,给你一个测试地址:166.111.9.2,你的机器打开以后http://166.111.9.2看你能不能看到人家Web服务器的内容。看不到,说明IP层有问题,IP层有问题,你的应用层不出问题那就是天底下最奇怪的事情了。地基没有了,房子能不倒么?
再给你几个DNS服务器的地址:
[qingping@wqpbsd ~]$ nslookup
> set type=NS
> edu.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
edu.cn nameserver = DNS.edu.cn.
edu.cn nameserver = NS2.CUHK.HK.
edu.cn nameserver = NS2.NET.edu.cn.
edu.cn nameserver = DENEB.DFN.DE.
edu.cn nameserver = DNS2.edu.cn.
Authoritative answers can be found from:
> com.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
com.cn nameserver = c.dns.cn.
com.cn nameserver = cns.cernet.net.
com.cn nameserver = f.dns.cn.
com.cn nameserver = d.dns.cn.
com.cn nameserver = b.dns.cn.
com.cn nameserver = a.dns.cn.
com.cn nameserver = e.dns.cn.
看到这么多的DNS服务器了吧?现在告诉你他们的IP地址:
wqpbsd# nslookup
> dns.edu.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: dns.edu.cn
Address: 202.112.0.35
> NS2.NET.edu.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: NS2.NET.edu.cn
Address: 202.112.0.33
> DENEB.DFN.DE
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: DENEB.DFN.DE
Address: 192.76.176.9
> a.dns.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: a.dns.cn
Address: 203.119.25.1
> cns.cernet.net
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: cns.cernet.net
Address: 202.112.0.44
> b.dns.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: b.dns.cn
Address: 203.119.26.1
> c.dns.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: c.dns.cn
Address: 203.119.27.1
> d.dns.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: d.dns.cn
Address: 203.119.28.1
> e.dns.cn
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
Name: e.dns.cn
Address: 203.119.29.1
>
顺便说一声:我用的DNS Server地址是202.106.0.20
顺便强调一下:OSI的7层模型其实不仅仅是有相当的理论意义,其实在指导排错的时候也是非常有用的。
[ 本帖最后由 wuqing 于 2009-5-11 08:21 编辑 ] |
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