The measure is that the node running bitcoin removes the cap to the number connection slots. The cap for connection slots I have found is set to no limit when running a bitcoin service.
Sorry I stand corrected, back in 2011 looks like a cap of 125 connections was introduced Is there a connections limit on bitcoind?
in the net.cpp file https://bitcointalk.org/index.php?topic=52772.msg629593#msg629593
but this has since been changed and I dont think there is a cap anymore... Looking at the file looks like this is the area you are interested in: https://github.com/bitcoin/bitcoin/blob/master/src/net.cpp#L1081 and the values set here https://github.com/bitcoin/bitcoin/blob/master/src/net.h