MyNetSec

This is a simple formula to calculate the mac-address for checkpoint loadsharing on multicast mode. This step is important as without configuring a static arp, most of the Cisco routers/switches that is interconnecting with the firewall cluster will not function. Taking the following formula into consideration: Divide the Ip address into 4 octets as follow: x.y.z.w If  y <=127 then the mac address will be 01:00:5e:y:z:w Simply convert the y:z:w from decimal to Hex example: 10.1.1.1 then the mac adress will be 01:00:5e:01:01:01 if y > 127 then the mac address will be  01:00:5e:(y-128):z:w Use the value for y minus 128 then convert them from decimal to Hex. Example: 10.157.1.1 then mac address will be 01:00:5e:(157-128):z:y = 01:00:5e:1d:01:01