ProxyAV 810 running 184.108.40.206 frequently pings its default gateway.
ProxyAV 810 appliances running AVOS 220.127.116.11 periodically ping the default gateway to work around a rare network interface issue.
This issue only affects the ProxyAV 810 appliances and the pinging behavior only occurs on AVOS 18.104.22.168. As soon as the network interface issue is resolved, the ping workaround will be removed. (as of the 31/5/2012 the Ping will still occur in all Proxy AV releases)