I've already join ER605 (router) & SG6428X (switch, DHCP server) in one site. But I cant find where to binding client MAC - IP . Every time I reboot the client PC, they changed the IP !! I didnt see...

in this case, do I need to set DHCP server on ER605 ? or I can set it on SG6428X with 2 VLAN interface?

I have four static external IPs, two ER605 routers, and one SG6428X switch. I want one ER605 to control two static IPs (WAN) and manage a group of PCs behind each ER605. At the same time, I want...