These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.04 s (backtrack: 0/20).

[ebuild  N     ] net-libs/libnet-1.3-r1:1.1::gentoo  USE="-man -static-libs -test" 603 KiB
[ebuild  N     ] net-analyzer/ettercap-0.8.4.1::gentoo  USE="ipv6 ncurses plugins -doc -geoip -gtk -test" 5674 KiB

Total: 2 packages (2 new), Size of downloads: 6277 KiB