dns problem

[eng.waleed]

the tcp is opened what I have to check also?
----- Original Message ----- 
From: "John DeDourek" <dedourek at unb.ca>
To: "For users of Fedora" <fedora-list at redhat.com>
Sent: Sunday, April 01, 2007 10:13 PM
Subject: Re: dns problem


> Ulrich Drepper wrote:
>> eng.waleed wrote:
>>
>>> On my DNS server when I make nslookup for some site I have this message
>>> ** server can't find XXXX: SERVFAIL but the site found and resolved on
>>> other servers, what I have to check
>>>
>>
>> I've had this for quite some time as well.  It seems to happen with
>> sites which has a lot of information in the DNS record (like many IP
>> addresses).  Sometimes the same sites work, probably if the record is
>> slightly rearranged (reordered IP addresses or so).
>>
>> It is a problem with bind but I haven't been able to look deeper into it.
>>
>>
> Just a thought.  This is from reading the DNS standards some
> years ago.  (It may have changed meanwhile.)
>
> In the case that a reply from a remote server
> won't fit in a standard sized UDP reply, the remote server
> sends you a "reply truncated" indication and your local server
> is supposed to re-request the information using a TCP
> connection rather than UDP.  Do you have both UDP and TCP
> open in the firewall for the appropriate ports?  (There is
> also the possibility that the remote site doesn't realize
> this and has not opened both TCP and UDP.)
>
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