HOW DO I BLOCK ROUGE DHCP SERVER

Question

HELLO 
 how can i block rouge dhcp servers in my network. 
 my lan network is not secure because of this

Emile Belcourt · Answer

Hello Charles, 
 You can't, really. Not unless you have a form of NAC or other switch based security so you can layer 3 Intercept and reroute the rogue DHCP packets. 
 A cursory google brings up this spiceworks article: 
 The Xg has no function for this as it occurs behind the XG. 
 Emile