We currently run 3 PPPoE servers using an OSPF concentrator and radius to manage the IP addresses. With this setup, it doesn't matter which IP lands on which PPPoE server. OSFP handles it.
We now need to do something similar with DHCP. I've been messing around with /32's and Option 121, but just can not get a stable solution. I'm now thinking about plan B. Similar general setup we use on the PPPoE side. Lets say we go with 3 DHCP servers connected to an OSPF concentrator. I would have to set my DHCP network on all 3 servers to something like 192.168.0.0/23 for about 512 address total. Server one will do a GW of 192.168.0.1, Server two will do a GW of 192.168.0.2, server 3 will do a GW of 192.168.0.3. When a client connects they will randomly connect to one of the 3 servers and receive an IP address from radius. My current thoughts are 1. Each server will have a /32 address not the /23. IP address on server 1 will be 192.168.0.1/32. 2. OSFP will only announce the /32 address of the server to the concentrator. 3. I will have to use the DHCP script option to insert and delete the clients ip address as a /32 in OSPF on the server to update the concentrator. The one issue I see off the bat is when a client reboots. If the client reboots and moves from server 1 to server 3, I now have two servers with the same IP address. I think I can deal with that by using a short lease time. Thoughts? I'm still digging around looking for other (better) options of having DHCP fail-over. The one option that will not work is reserving a block of IPs per server. We have several customers that are using static IPs, so they need to be accessible from all 3 servers. -- Thanks, Mark mailto:m...@mailmt.com Myakka Communications www.Myakka.com Serving Manatee and Sarasota Counties with High-Speed Internet for over 20 years -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
