JM> On Wed, Nov 24, 2004 at 04:08:06PM +0100, Hexren wrote: JM> : location. 510 could identify a rack or a datacenter so that JM> : us.510.mail.example.com means "a mail server in the datecenter with JM> : the id 510 which serves the United States".
JM> So 'us.510.mail' is an atomic, arbitrary identifier. All three as a unit JM> identify a certain node, and are selected purely for convenience of human JM> operators, right?
I would say yes.
JM> I'm just making sure that the network doesn't treat 'us.510.mail' any JM> different than it would treat 'foobar', right?
I would say yes too.
How does this square with the fact, as I understand it, that I can delegate authority for mail.example.com to new nameservers which can then publish host information about this zone? Here's the example zone file extracts from the article I linked to in an earlier mail, which is delegating authority for the sub domain us.example.com:
<quote>
; zone fragment for 'zone name' example.com
; name servers in the same zone
example.com. IN SOA ns1.example.com. root.example.com. (
2003080800 ; serial number
2h ; refresh = 2 hours
15M ; update retry = 15 minutes
3W12h ; expiry = 3 weeks + 12 hours
2h20M ; minimum = 2 hours + 20 minutes
)
; main domain name servers
IN NS ns1.example.com.
IN NS ns2.example.com.
; mail domain mail servers
IN MX mail.example.com.
; A records for name servers above
ns1 IN A 192.168.0.3
ns2 IN A 192.168.0.4
; A record for mail server above
mail IN A 192.168.0.5
....; sub-domain definitions $ORIGIN us.example.com. ; we define two name servers for the sub-domain @ IN NS ns3.us.example.com. ; the record above could have been written without the $ORIGIN as ; us.example.com. IN NS ns1.us.example.com. ns3 IN A 10.10.0.24 ; 'glue' record ; the record above could have been written as ; ns3.us.example.com. A 10.10.0.24 if it's less confusing </quote>
Peter.
--
the circle squared
network systems and software
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