Description of problem:
When you start two portals on one machine (I use -Djboss.socket.binding.port-offset=100 to avoid port conflict) and each of them has unique multicast adress recognize each other. 

Steps to Reproduce:
1. Start h2: java -cp modules/system/layers/base/com/h2database/h2/main/h2-1.3.168-redhat-2.jar org.h2.tools.Server
2. start first node: sh standalone.sh -c standalone-ha.xml -u 239.255.19.40
3. start second node: sh standalone.sh  -c standalone-ha.xml -Djboss.socket.binding.port-offset=100 -u 239.255.19.43

Actual results:
Nodes recognize each other

Expected results:
Nodes won't be able to recognize the other.

Additional info:
In portal 6.1.1 everything works as expected.