smtp load balancer???

Chris Conn cconn at ABACOM.COM
Wed Dec 7 20:40:05 GMT 2005

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>> avhost      5       IN      A
>> avhost        5       IN      A
>> gives you a 5 second TTL on both records.  Remove one, reload DNS, and 
>> 5 seconds later it never existed.
> Been there, done that. My FreeBSD machines worked fine, my Macs worked 
> fine, my clients with Windows 2003 server continued to cache the record. 
> Two weeks ago I changed the IP on from 
> to, yet I still have traffic. This is not supposed to be 
> so, I have had plenty of people tell me is not so, yet I have traffic. 
> When I call a client and have them go to their office server and run 
> "ipconfig /flushdns" everything works again.
> DAve

Hmm, that's too bad.  My Windows DNS server does not behave like that.  My 
other UNIX servers are fine too, and to my knowledge I have not found a MS 
client that would override the record TTL.

It does not really matter since I do not rely on this method, however my 
experience differs from yours it seems when it comes to DNS ttls.

How did you declare the record and the TTL in the DNS?


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