I'm implementing different applications that will use UDP to exchange real-time data, thus a low impact on performance is very important. This system will not be connected to the Internet so I just need a symmetric encryption mechanism and one option would be AES-128. I am googling a lot but I am not finding a lot of material about the combination of AES, UDP and C++, is it not used much? Any resources would be really appreciated!
Would DTLS be an appropriate choice for this case in this private LAN far away from the internet?
I've posted a similar question on Information Security SE with more details (after the answers here came in).