IP Security (IPSec) is mandatory for IPv6implementations. Given that IPv6 will be dominated by commercial off the shelf (COTS)software products, many in the DoD community will have a software encryption capability attheir disposal.
1 The lowest monthly average temperature in Fountain Hills for December is 54 degrees. 2  The most monthly precipitation in Fountain Hills occurs in January with 0 inches.  The air quality index in Fountain Hills is 48% worse than the national average.
Although not a census-designated place (it is grouped with Knoxville for census-purposes), the populations of the two ZIP codes that serve Fountain Cityâ 37918 and 37912â were 36,815 and 18,695, respectively, as of the 2000 U.S. census.