MX freebsd

[Greg Maruszeczka]

Glenn Dawson wrote:
> At 09:58 AM 11/26/2005, Greg Maruszeczka wrote:
> 
>> Glenn Dawson wrote:
>> > At 04:53 PM 11/25/2005, Beecher Rintoul wrote:
>> >
>> >> On Friday 25 November 2005 03:43 pm, Francisco Reyes wrote:
>> >> > dick hoogendijk writes:
>> >> > > Any idea how long it takes until the MX freebsd mailservers 
>> know that
>> >> > > my mail relay has changed? It's three days ago now that I changed
>> >> my MX
>> >> > > records and still mail for nagual.st is routed to my old mx
>> >> > > mailservers.
>> >> > >
>> >> > >dig nagual.st mx
>> >> >
>> >> > ;;; QUESTION SECTION:
>> >> > ;nagual.st.                     IN      MX
>> >> >
>> >> > ;; ANSWER SECTION:
>> >> > nagual.st.              86400   IN      MX      10 mx1.mailhop.org.
>> >> > nagual.st.              86400   IN      MX      20 mx2.mailhop.org.
>> >> >
>> >> > >bc
>> >> >
>> >> > 86400/3600
>> >> > 24
>> >> >
>> >> >
>> >> > Should only take a day based on the results above.
>> >> >
>> >> > The command to see your XM settings is
>> >> > dig <url> mx
>> >>
>> >> Did you update the serial number when you changed the MX record?
>> >> Servers downline will not see the changes otherwise.
>> >
>> >
>> > Actually, the serial number is only used by the slave servers for a
>> > particular zone to decide whether or not a zone transfer is needed.
>> >
>>
>> I don't think that's entirely true. The serial number is also used by
>> named internally to determine whether to reload your zones, and hence,
>> to make the actual change in memory. AFAIK if you don't update the
>> serial number the change won't take effect.
>>
>> To confirm this I just ran `rndc reload` and then checked
>> /var/log/messages on my closest available OBSD name server. Reloaded
>> named.conf but NOT my zone files. Then I changed the serial on one of my
>> primary zone files and ran `rndc reload` again. This time syslog records
>> that both named.conf and that zone have been reloaded.
> 
> 
> Did you actually make a change to one of the zone files? or did you just 
> look at logs?
> 
> If you make a change to one of the zone files without changing the 
> serial number, and then do rndc reload, the changes will be reflected in 
> queries sent to that named process.
> 
> To quote the fourth edition of "DNS and BIND" page 432:
> 
> "When you reload the primary, it loads the updated zone file regardless 
> of whether you've changed the serial number."
> 

I stand corrected. Thanks for the clarification and reference.

G