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

Calculating dependencies ... done!
Dependency resolution took 1.00 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-misc/sipp-3.7.7::gentoo  USE="pcap ssl -gsl -sctp" 913 KiB

Total: 2 packages (2 new), Size of downloads: 1516 KiB