constant DNS querying for 127.0.0.1

Hello,

I'm quite puzzled... I noticed a constant low bandwidth traffic on the WAN port of the router and tracked it back to the MacOS X (10.5.2) host constantly DNS querying for 127.0.0.1 (about every three seconds). I am using DHCP and the network configuration picks up the external DNS server.

I thought this localhost information should be picked up directly from /etc/hosts (in my case)
cat /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
fe80::1%lo0 localhost

and there should be no need to ask for this reverse DNS name resolution to the external DNS server.

do I really have to use dscl and create an entry for localhost to stop this DNS querying activity?

andrea