Ip helper address9/17/2023 Windows 2008 R2 to active-failover redundancy in Windows 2012. The redundancy of your DHCP servers not only depends on your OS, but the specific version! For Windows that was mentioned, your options range from a true split-scope in All the listed servers configured receive the DHCPDiscover packet by the router relay. maybe.Īll ip helper-address lines configured in your VLAN take the DHCP broadcast from the client, add the router's (gateway) address into the UDP packet, then unicasts to the DHCP servers. I was asked about ideas and I mentioned Infoblox, but that's in the future. Unfortunately, this is a Microsoft only DHCP Server option. Is there any way to get the ip-helper to "round-robin" between the two? What if the first server's dhcp service is having a problem - but the server is still reachable via the network (you can ping it, but dhcp service is down)? Or what if the DHCP scope is full? Will the second ip-helper address help? Will the second address only come into play if the first server is hard down? What is the best practice to provide DHCP service redundancy? If there are two dhcp servers, and two "ip-helper" addresses, will the network only forward dhcp requests to the first IP as long as it's reachable from a network perspective? If it goes down, then dhcp goes to the second address? The switches are layer 2 trunked to the core, where the VLAN interfaces are, routing happens, and DHCP is forwarded to the DHCP server. Each switch has a data VLAN and a voice VLAN. Our topology is such that we have two 4510's in our IDF closets.
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