i have a question ?
Barry Margolin
barmar at alum.mit.edu
Thu Apr 14 14:42:19 UTC 2016
In article <mailman.558.1460634920.73610.bind-users at lists.isc.org>,
johnzeng <johnzeng2013 at yahoo.com> wrote:
> Hello Dear Sir :
>
> i have a question , i build a dns server ( forward mode ) , i hope dns
> server will cover forward and cache only .
>
> but i found a strange string. when i reslove y0.ifengimg.com via
> nslookup command between a client and a dns server .
>
> i found there are different result . i hope the result will be same
> between a client and a dns server .
I suspect chinacache.net is a CDN, it gives different answers to
different clients depending on their location.
>
>
> if possible , please give me some adivisement
>
>
> John
>
> ----------------------------------------------------------
>
> this is my config
>
> ----------------------------------------------------------
>
> controls {
> inet 127.0.0.1 port 953
> allow { 127.0.0.1; } keys { "rndc-key"; };
> };
>
> max-ncache-ttl 30;
> max-cache-ttl 60;
>
> tcp-clients 10240;
>
> forward only;
> forwarders{ 202.96.134.133; 202.96.134.133; 202.96.134.133; };
>
> };
>
> allow-query { any; };
>
> allow-query-cache { any; };
> zone "." IN {
>
> type hint;
>
> file "named.root";
>
> };
>
> zone "localhost" IN {
>
> type master;
>
> file "localhost.zone";
>
> allow-update { none; };
>
> };
>
> zone "0.0.127.in-addr.arpa" IN {
>
> type master;
>
> file "named.local";
>
> allow-update { none; };
>
> };
>
>
> -------------------------------------------------------
>
> this is a client and nslookup result
> -------------------------------------------------------
>
>
> root at laptop:/accerater/config/dns# nslookup y0.ifengimg.com
> Server: 202.96.134.133
> Address: 202.96.134.133#53
>
> Non-authoritative answer:
> y0.ifengimg.com canonical name = y0.ifengimg.chinacache.net.
> y0.ifengimg.chinacache.net canonical name = cc00066.h.telssr.chinacache.net.
> cc00066.h.telssr.chinacache.net canonical name =
> hpcc-page.telssr.chinacache.net.
> Name: hpcc-page.telssr.chinacache.net
> Address: 183.2.202.48
> Name: hpcc-page.telssr.chinacache.net
> Address: 14.215.89.9
>
>
>
> -------------------------------------------------------
>
> this is a dns server and nslookup result
> -------------------------------------------------------
>
> root at app:/appgame/sbin# nslookup y0.ifengimg.com
> Server: 127.0.0.1
> Address: 127.0.0.1#53
>
> Non-authoritative answer:
> y0.ifengimg.com canonical name = y0.ifengimg.chinacache.net.
> y0.ifengimg.chinacache.net canonical name = cc00066.h.telssr.chinacache.net.
> cc00066.h.telssr.chinacache.net canonical name =
> hpcc-page.telssr.chinacache.net.
> Name: hpcc-page.telssr.chinacache.net
> Address: 14.215.89.11
> Name: hpcc-page.telssr.chinacache.net
> Address: 14.215.89.9
--
Barry Margolin
Arlington, MA
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