weird problem when making MX-type DNS queries

  • Thread starter Thread starter Emilio
  • Start date Start date
E

Emilio

Hello

I've got a problem making DNS queries, from my leased line.
I've been trying to install a Mail Server (Mail Trasfer Agent) but I've
found that DNS queries for MX do not respond in time.
I've used my laptop, with WinXP Pro SP2, for trying DNS queries; using some
tools (nslookup, and PingProbe (a graphical tool)), and always happens the
same scenario:

When I make queries from my leased line connection, A-type DNS queries,
responds sucessfully; but MX-type DNS queries do not.
When I make DNS queries of any type, connected from other leased lines, all
queries are sucessfully treated, and MX-type queries return the
corresponding MX records.

I get response from ping command when pingging to those DNS servers I
usually consult, and because A-type queries get answers, I guess connections
(using port 53) can be established.


I wonder what is happening and if anyone can help me.

Thanks in advance
Emilio
 
Are you using an ADSL (broadband) router to perform DNS forwarding? I've
found that the DNS implementations in some do not cater for MX records, hence
if you run a mailserver behind one you will have trouble.

If so, workarounds are to use your ISP's DNS servers directly, or to install
a local server. If you don't have the MS DNS server, alternatives are MaraDNS
(Windows) or dnsmasq (Linux)
 
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