How to use two HDAs on the same network
From Amahi Wiki
Make sure both HDA use different domain names.
You'll need to re-apply this fix on every update of hdactl.
You'll need to run the commands below on both your HDAs.
You'll need to edit named.patch before executing the patch command:
On your main HDA: replace home.com with your second HDA domain name, and 192.168.1.10 with your second HDA real IP address.
On your second HDA: replace home.com with your main HDA domain name, and 192.168.1.10 with you HDA real IP address.
(as root) wget -O named.patch http://wiki.amahi.org/images/c/ca/Named.patch patch -p0 < named.patch service hdactl restart