FWIW: We experienced "sendto failed: No buffer space available" as well. QOS is not configured, but the firewall is connected to a satellite link that drops between 5-10% packets average. The explanation fits in with our situation.
-----Original Message----- From: owner-m...@openbsd.org <owner-m...@openbsd.org> On Behalf Of Stuart Henderson Sent: Friday, 17 April 2020 3:05 PM To: misc@openbsd.org Subject: Re: Unbound Notice: "sendto failed: No buffer space available" On 2020-04-16, William Ahern <will...@25thandclement.com> wrote: > I'm no network administrator, but a 3% failure rate would be very high > on a physical interface. vlan4 is presumably the interface your Apple > device passes through, right? Investigate why all the dropped packets. > Start with your queuing rules: examine/enable PF statistics, > examine/enable PF logs, or just disable queueing to rule it out entirely. It's almost certainly the queueing. I would skip queuing for DNS packets or use a separate queue so they aren't affected by bulk transfers, by its nature it drops packets and if you do that to DNS it's going to make the end-user experience of the network very poor.
