Hi Bryan, Let me summarize your issue, so as we check if I understand it correctly:
- You have 3 subnets where you have DHCP clients, of which some have and some don't have static reservations. - Router (relay agent) will use one of 3 different giaddrs when relaying messages to the server over a single link (relay-server link) connected to a particular interface on the DHCP server. - For clients for which addresses should be assigned dynamically we want the server to use giaddr to pick the correct subnet. - For other clients, which have static addresses, it is possible that the giaddr may vary and in 2 out of 3 cases the client will not have a subnet corresponding to his static reservation selected. As a result the client will get a dynamically assigned address, rather than static one. - You want to define a static reservation for a given client's MAC address which should be used regardless of the giaddr appearing in a relayed message. The problem with this approach is that our host reservations are strictly associated with a subnet (subnet id) selected for a client. This selection takes place even before we check for host reservations. The subnet id (and MAC address) is used as an input to search for static reservations for a client. I need to think a bit more about this issue, but for a time being, would it be simply possible to insert 3 reservations for the same host, differing by the subnet identifier? In that case, no matter which subnet id is selected for the client, the server should always find a suitable reservation. That may be not viable if I misunderstood your use case :-). This also has an issue that you have redundant information in the database and this doesn't scale well with many reservations. Thanks, Marcin Siodelski ISC On 11.05.2016 23:24, Bryan Perry wrote: > So any guidance from the ISC gurus on this topic? My host reservation > seems to work fine only if the correct subnet is assigned, but if a > different subnet (still part of the same shared network) is assigned > then the client gets a lease from a pool. If I lock down the upstream > router to only use the XXX.YYY.169.1 giaddr then normal DHCP clients who > need addresses from the 170 or 171 subnets get nothing. > > Can I define multiple non-contiguous address pools inside the same > subnet declaration to handle both the static and dynamic clients? > > I'm stumped. Thanks for any help. > -Bryan > > On 5/10/2016 1:05 PM, Thomas Andersen wrote: > > Not sure that you can, and I’m not sure it’s how it is intended. > > But it’s a bit deeper than what i normally deal with. > > > > Maybe one of the ISC guys can elaborate. > > > > > > Br, > > Thomas > > > > > > > > > > On 10/05/16 20:58, "[email protected] on behalf of Bryan > > Perry" <[email protected] on behalf of [email protected]> > > wrote: > > > >> So the question becomes, how do I force it back to subnet 169 when the > >> DHCPDISCOVER comes in from the .170.1 relay address (which is the same > >> router) and the hosts entry is for subnet 169? > _______________________________________________ > Kea-users mailing list > [email protected] > https://lists.isc.org/mailman/listinfo/kea-users _______________________________________________ Kea-users mailing list [email protected] https://lists.isc.org/mailman/listinfo/kea-users
