Hello,
I'm running an exit relay > 200 Mbit/s with local unbound on openbsd. I receive a lot of the following syslog messages from unbound:
unbound: [15040:1] error: recvfrom 226 failed: Host is down
I already increased the UDP buffer sizes:
net.inet.udp.sendspace: 262144 net.inet.udp.recvspace: 262144
(hopefully) relevant part from unbound.conf is:
num-threads: 2 msg-cache-slabs: 4 rrset-cache-slabs: 4 infra-cache-slabs: 4 key-cache-slabs: 4 rrset-cache-size: 100m msg-cache-size: 50m outgoing-range: 450 outgoing-port-avoid: "22,25,26,37,54,55,67,68,69,80,110,123,135,137,138,139,143,443,445,465,500,587,843,990,912,993,995,1025,1863,1935,2400,4242,4400,4421,4444,4445,4480,4500,4569,5038,5050,5060,5061,5062,5063,5064,5065,5198,5199,5200,5222,5555,5800,5801,5900,5901,6666,6667,6668,6669,7000,7001,7002,7003,7004,7005,7006,7658,7659,7660,7777,8050,8052,8054,8056,8058,8060,8080,8110,8118,8120,8123,8125,8143,8998,9001,9022,9030,9050,9051,9052,9053,9054,9055,9056,9057,9058,9059,9060,9080,10000,15000,15001,15002,15003,15004,16001,16999,20000,20001,25000,26999,29998,30600,31000,32000,36999,50300" outgoing-num-tcp: 25 incoming-num-tcp: 25 msg-buffer-size: 65552
I couldn't find any hints on the internet apart from increasing UDP buffers, any ideas what else to look for?
Thank you!
w.