Problem
Okay, I have been getting a few of these packets in my firewall log:
eth1 12 udp packets from 17.173.254.223 port 16387 (-) to 192.168.1.2 port 61560 (-)
Solution
Go into Settings > General> Restrictions on the iPhone, scroll down to the very last option 'Game Center'. Change the 'Multi Player Games' option to 'OFF'.
Source: http://www.techrepublic.com/forum/questions/101-337095
