After installing Amahi a few days ago I am in the need of changing the ip number to 192.168.2.8. I had to change a setting in my router and this is what the numbers are like now. 192.168.1.9 was the old number that amahi used before.
You can only change the third digit. You can set the router typically to only serve a single DHCP address and make that the one for the HDA. Then use the HDA for the DHCP server for the network.
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My HDA: Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz on MSI board, 16GB RAM, 1TBx1+2TBx2+4TBx2