Slave Server Slow in updating

[Sam Pointer]

I am running BIND 9.1.3 on Redhat 2.4.7-10 and have a master with a single
slave. There are no firewall complications. My slave server has the
following SOA record:

$TTL 0
mydomain.com.	IN	SOA	ns1.mydomain.com. root.mydomain.com. (
2002012302 3m 3m 1w 0 )

which I know are agressive values, but I'm testing and want my changes to
propigate fast.
In my named.conf of my slave server I have the entry:

zone "mydomain.com" in {
	type slave;
	masters { xxx.xxx.xxx.xxx; };  <- address of ns1.mydomain.com.

I would suspect then that if I update the serial number on the master then
the changes would take 3mins to move to the slave. Instead they seem to much
much longer. Am I missing something fundemental?

Any help appreciated; just shout if you need some info that I've left out.
Thanks all in advance.


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