TTL value

[rac8006 at aol.com]

I'm investigating why the browse.dat file on my system is  written every
few minutes.  I've traced part of it to update_server_ttl being called frequently.

update_server_ttl is being called by process_local_master_announce.  Is there 
some reason that my DNS-323 which is the master is sending this request.
The ip_default_ttl value on the DNS-323 is 64.  Is this a normal value?

RAC