are you using "ip helper" to relay the dhcp requests ?
On Wed, Sep 13, 2017 at 4:33 AM, Jeff Kletsky <[email protected]> wrote: > I've been able to get kea to run nicely as a DHCP server in "conventional" > mode with an interface listening on every one of the VLANs that I need to > serve. > > I'm trying to configure it now so that it only responds to relayed DHCP > through my Cisco SG300-series switches. > > "dhcp-socket-type": "udp" > > is already set. > > > I've been able to decode the Cisco format and it appears to properly > assign the client-class based on the VLAN: > > kea.conf: > > "client-classes": [ > <?include "/usr/local/etc/kea/client_classes.conf"?> > ], > > client_classes.conf includes: > > { > "name": "VLAN_1010", > "test": "substring(relay4[1].hex, 2, 2) == 0x03F2" > } > > > Thanks to the debugging instructions in 13.9 (very helpful!), I was able > to fix my first shot and "test" the above expressions. They match as > expected, with that match being logged in the kea-dhcp4 log: > > EVAL_RESULT Expression VLAN_1010 evaluated to 1 > > > In my application, the DHCP server and switches are "talking" on addresses > in the 10.2.87.0/24 range, but the pool is in the 10.10.10.0/24 range. > > > Setting the subnet parameter to correspond to the pool results in "failed > to select a subnet for incoming packet" > > The subnet parameter is mandatory, so I can't just use the client-class to > select the pool > > If I set it to 10.2.87.0/24 then kea won't start, complaining that the > pool does not match the prefix of the subnet > > So far, only the rather ugly solution of setting the subnet to one that > overlaps both the interface's address and the pool is all I've found to be > functional > > { > "subnet": "10.0.0.0/8", > "pools": [ { "pool": "10.10.10.200 - 10.10.10.219" } ], > "client-class": "VLAN_1010", > > [...] > > (similarly <?include "ed"?> in the subnet4 section) > > > The kea instance will *only* be answering relayed DHCP, never direct > connections. > > > Is there a better way to configure this? > > > TIA, > > Jeff > > > > > > > > _______________________________________________ > Kea-users mailing list > [email protected] > https://lists.isc.org/mailman/listinfo/kea-users >
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