vom513 <vom...@gmail.com> wrote: > On my firewall I have a bit of a complex setup in terms of interfaces. I do > VLAN trunking / subifs, SQM for bufferbloat, and some “aliases” (ex: eth0:0 - > secondary IP on same subnet). > > Under ISC dhcpd I don’t see this behavior. I discovered this (no pun > intended) with a Nagios check_dhcp script. > > If I send a unicast request direct to the server, I get one response. If I > send a broadcast - it seems the server is “hearing it twice” ? I see > multiple replies in the logs for actual clients as well. > > In the middle of writing this message, I decided to try messing with the > alias. Seems to be the culprit. If I ifdown the alias interface - I get one > response. Seems like Kea binds (??) to the alias as well - even though it’s > not defined in the interfaces in config. I could bring it back up after Kea > was running and everything was fine. It’s only when Kea starts and this > alias exists that I get this behavior (i.e. on a fresh boot). > > Also to be very clear, not only is this an alias, but it’s an alias on a VLAN > subif. Don’t know how much that matters: > > enp1s0f4d1.10:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 > inet 192.168.64.10 netmask 255.255.255.0 broadcast 192.168.64.255 > ether 00:07:43:16:0d:e8 txqueuelen 1000 (Ethernet) > > Is there some knob that can be turned to pare this down to just the actual > interface in the config ? Or did I stumble on a bug ?
Rather than adding an alias (extra interface), have you considered the more modern way of simply adding addresses ? Using /etc/network/interfaces I just add a couple of lines (you’ll need to double check syntax as I’m typing from memory) : iface eth0 ... post-up ip addr add a.b.c.d dev eth0 pre-down ip addr del a.b.c.d dev eth0 With other methods of network configuration, you’ll need to figure out how they handle the same thing. Simon -- ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users. Kea-users mailing list Kea-users@lists.isc.org https://lists.isc.org/mailman/listinfo/kea-users
