Wireless networking in Linux is really easy to use. The wireless-tools allow to explore and configure wireless network.
This site needs donations of content and time, not money
Netlink is a flexible, robust, wire-format communications channel typically used for kernel to user communication although it can also be used for user to user and kernel to kernel communications.
There are a wide range of tools available for measuring network performance. Common ones are:
In the "Delaying only some traffic" section of this page, the following code is given as an example of how to create a delay to just one ip address:
Short list of conferences with Linux networking related attendees:
Page based on Documentation/networking/ip-sysctl.txt.