Re: NT DNS forward server can not find 163.com's MX record in the cache.

Tech-Archive recommends: Fix windows errors by optimizing your registry

From: Tianjin Hu Hao (tjhuhao_at_sina.com.cn.discuss)
Date: 11/16/04 

Date: Tue, 16 Nov 2004 09:30:57 +0800

Thanks Dana & Ace for your invaluable help.

I route all mails to 163.com through HQ's mail server now. So, although my
DNS still can not find 163.com's MX record, I can ignore it now.

Thank you very much!

"Tianjin Hu Hao" <tjhuhao@sina.com.cn.discuss> 写入消息新闻:%232hSxsvwEHA.2192@TK2MSFTNGP14.phx.gbl...
> Hi all,
>
> I am using a NT DNS server in my internal network, the query to DNS server
> is forwarded to headquarter's DNS server and ISP's DNS server.
>
> The problem is: When I clean the DNS server's cache, I can find 163.com's
> MX
> record if I query my DNS immediately, But then I can not find it again
> once
> 163.com's record is cached in the NT DNS cache. And 163.com is a very big
> free email provider in China which is impossible for me to ignore the
> error.
>
> Some background:
>
> 1. There is no problem when I use nslookup to test 163.com's MX on my HQ's
> DNS and ISP's DNS.
>
> 2. I have found only 163.com's MX query problem on my DNS server. Other
> queries are OK.
>
> 3. The structure of 163.com's MX is quite strange. There is a MX record,
> MX
> record's result is m***.163.com, then there is a CNAME record map the
> m***.163.com to m***.mail.163.com, finally there is an A record map the
> m**.mail.163.com to IP address. Mail exchanger record for other site is
> just
> a MX record, then an A record map it to IP address. there is a CNAME
> record
> extra for 163.com.
> for example:
> first
> 163.com MX preference = 50, mail exchanger = m208.163.com
> then
> Name: m209.mail.163.com
> Aliases: m209.163.com
> finally
> Name: m209.mail.163.com
> Address: 202.108.44.209
> I think the structure of 163.com's MX record might lead to this error.
>
> 4.From my DNS server's capture packets, after the cache is cleared, when
> the
> client query my server at the first time, my server will query HQ's DNS
> "Standard query MX 163.com", then HQ's DNS returned "Standard query
> response
> MX 50 m207.163.com MX 50 m208.163.com MX 50 m209.163.com ......", then my
> server will return it to the client.
>
> But after the first time query, my server will query HQ "Standard query A
> m207.163.com", then HQ return "Standard query response CNAME
> m207.mail.163.com A 202.108.44.207" to my server, then my server keeps on
> query HQ m208,m209....163.com's A record, but my server doesn't return
> anything to client.
>
>
> Looking forward for somebody can help me. Thanks a lot for your help!
>
>
>

Relevant Pages

  • Issues migrating SBS 2003 domain to Server 2008 Standard
    ... We are stuck migrating our SBS 2003 domain to Server 2008. ... Fatal Error:DsGetDcName (SRV-EXCH) call failed, ... Verify your Domain Name Sysytem (DNS) is ... network connectivity to a domain controller. ...
    (microsoft.public.windows.server.sbs)
  • Re: AD management snap in cannot find DC (netdiag /v workstation)
    ... The name.local entries are used by my apache server to implement ... change button, more button, the "Primary DNS suffix of this ... Attr: subschemaSubentry ... Owner of the binding path: ...
    (microsoft.public.windows.server.active_directory)
  • Re: AD management snap in cannot find DC (netdiag /v workstation)
    ... button, more button, the "Primary DNS suffix of this computer", it should ... The Security System could not establish a secured connection with the server ... Attr: subschemaSubentry ... Owner of the binding path: ...
    (microsoft.public.windows.server.active_directory)
  • Re: AD management snap in cannot find DC (netdiag /v workstation)
    ... DNS Host Name: tonyb-pc.imageproc.imageproc.com ... Testing IpConfig - pinging the DHCP Server... ... Attr: subschemaSubentry ... Owner of the binding path: ...
    (microsoft.public.windows.server.active_directory)
  • Re: How to prevent DC from trying to register on root DNS servers
    ... The dynamic registration of the DNS record '. ... DNS server IP address: ... If you are hosting a public domain on the internet, and you host your own email, then I would create an MX record to tell the rest of the world what the mail exchanger is. ... They are only for MTA to MTA (mail server to mail server) communication. ...
    (microsoft.public.windows.server.dns)