I have had pretty good luck with the /32 method what routing platform
are you using? Assuming it is mikrotik it is pretty easy to do using
dhcp up and down scripts or proxy arp. Forget about the option 121 it is
not needed. What type of scale are you talking about 200 customers per
router or 2k customers per router?
On 2/11/25 16:12, Mark - Myakka Technologies via AF wrote:
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
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