[NTLUG:Discuss] OT - nslookup question

[Chris Albertson]

However, normally the authoritative server issues the TTL for each 
record, not the server cacheing the reply.
So, you, as the local server admin, don't have too much control over 
TTL's of other domain records.

Chris

Greg Edwards wrote:

> fredjame wrote:
>
>> Greg Edwards wrote:
>>
>>>
>>> Simply means that the answer came from a name server that knows the 
>>> answer, but is not the name server that manages the domain asked about.
>>>
>> I hope this isn't a silly question, but ... What is the possibility 
>> that the "name server that knows the answer, but is not the name 
>> server that manages the domain asked about" may be wrong?  Thank you 
>> in advance for any help you may be able to offer.
>> Regards
>> Fred James
>>
>
> Short answer is yes it can be wrong.  You really don't want the 
> loooong answer ;)
>
> There are factors that can cause a Non-authoritative server to return 
> a wrong answer.  For example, when a name server is being updated at 
> the source and a mistake is made it can happen.  But in practice it 
> doesn't happen that much when the authoritative server is stable.  
> That is, unless it's being done on purpose in a hijacking attempt.  
> Server admins can reduce the exposure of bad addresses by using a 
> fairly short TTL value, among other things.
>
> HTH