Hello, Since its almost 2019 and i was using ISC DHCP for probably ~15 years and i wanted to try something new i decided to upgrade my home DHCP server to Kea. Mostly i liked from its "new" features was json file format and mysql integration. My home network is small, ~25 devices, dual stack ipv4/ipv6 (ipv4 are local ips only), but i always try things at home before i deploy them at work. :) I can afford having DHCP server up and down every 5 min when testing configurations at home... while i cant at work ;P However i use pretty much same features at home or at work, so once i get things working at home i just edit config files with subnet/hosts changes and usually it works :) Anyway with transition to kea i hoped im gonna keep my old features and gain few new ones, however i was wrong and forced to roll back to ISC. Few things that bothered me, i know ISC was in development for like ~20 years and kea is only few years old but still.
Issue 1: DHCP DDNS still cant update same host with both A and AAAA records, found this issue ticket from 2017 http://oldkea.isc.org/ticket/4519. Any news on this? This is imo kinda a must in 2019... Issue 2: Handling of hosts for DDNS, in kea only option if client doesnt send fqdn host is to set host from IP address, while in ISC i have something like this to generate host from MAC (taken from dhcpv6): set host-macaddr = concat ( suffix (concat ("0", binary-to-ascii (16, 8, "", substring(option dhcp6.client-id, 8, 1))), 2), "-", suffix (concat ("0", binary-to-ascii (16, 8, "", substring(option dhcp6.client-id, 9, 1))), 2), "-", suffix (concat ("0", binary-to-ascii (16, 8, "", substring(option dhcp6.client-id,10, 1))), 2), "-", suffix (concat ("0", binary-to-ascii (16, 8, "", substring(option dhcp6.client-id,11, 1))), 2), "-", suffix (concat ("0", binary-to-ascii (16, 8, "", substring(option dhcp6.client-id,12, 1))), 2), "-", suffix (concat ("0", binary-to-ascii (16, 8, "", substring(option dhcp6.client-id,13, 1))), 2) ); if (not (option fqdn.hostname ~~ "^[a-z0-9][a-z0-9\-]+[a-z0-9]$")) { ddns-hostname = host-macaddr; } elsif (exists fqdn.hostname) { ddns-hostname = lcase(option fqdn.hostname); } else { ddns-hostname = host-macaddr; } Why i prefer host from MAC you may ask? It again goes to consistency if host is generated from IP then same device will have 2 different hosts in ipv4/ipv6 scenario, while if its generated from MAC you get 1 host with appropriate A/AAAA records, however since issue 1 exists... i guess this is not an issue at least not right now :) also please please forcing hosts to lower case, OCD is strong :) Issue 3: I dont know if its only with mysql backend or not, but at least you cant set same reserved ip for different mac addresses/duids (whatever you use for reserving ips), it errors out. Maybe if you set it thru config file it would work... or maybe give option to add multiple macs/duids for same IP address. Why you will ask? Simplest reason, you have laptop with both wired/wireless adapter and you want it to get always same IP. ISC seems to handle this, kea does not. Issue 4: This is something more like a wish then an issue about DDNS updates. Currently there is only hacky way around it that i dont like. But here is scenario that i want to implement in my home: you have bind with 2 views for specific domain (lets say lan.domain.com), one is local and other is public. I want host in local view for domain to resolve both A and AAAA records, while in public view i only want to see AAAA records (since A - local ips - are not accessible from outside anyway). For this to work i would need DHCP server to send updated that i want (in my case AAAA) records twice with 2 different TSIG keys, so i can filter and update both zones in bind separately. Currently only hacky way around is to bind send extra notifys for "fake" slave demon/server, that runs script that does AXFR transfers, diffs and greps whatever i need and pushes it back with nsupdate with appropriate TSIG key. Anyway other then that for half i day i had it runing Kea seems great, really loved mysql lease/hosts backend, however 1st (and 2nd) issue really bugs me out, i know that even in ISC dual stack update are done half hackish with interm/standard updates... but there must be more proper way? -- Sent from: http://kea-users.7364.n8.nabble.com/ _______________________________________________ Kea-users mailing list [email protected] https://lists.isc.org/mailman/listinfo/kea-users
