What is the problem?
When attempting to use DNS name of octopi.local from the octopi box, name resolution seams to be delayed to around 10 seconds, making certain parts of octoprint abandon name resolution and assume the name resolution has failed.
After name resolution has occured, all other network function is at the speed you would expect. Upon testing with other random names to check DNS resolution timings, these all respond <1 second.
What did you already try to solve it?
If I add octopi.local to my hosts file, this problem goes away. But this is a workaround and I'm trying to find the solution.
Logs (syslog, dmesg, ... no logs, no support)
Probably the most useful logging I can give you is copied below, but if there is benefit from other logs, please let me know. There is no logging of the name resolution in syslog as I've checked it over.
pi@octopi:~ $ dig octopi.local +search
; <<>> DiG 9.11.5-P4-5.1+deb10u3-Raspbian <<>> octopi.local +search ;; global options: +cmd ;; Got answer: ;; WARNING: .local is reserved for Multicast DNS ;; You are currently testing what happens when an mDNS query is leaked to DNS ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27516 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;octopi.local. IN A ;; ANSWER SECTION: octopi.local. 2 IN A 192.168.68.50 ;; Query time: 10 msec ;; SERVER: 192.168.68.5#53(192.168.68.5) ;; WHEN: Wed Mar 17 11:11:04 GMT 2021 ;; MSG SIZE rcvd: 57
pi@octopi:~ $ nslookup > server Default server: 192.168.68.5 Address: 192.168.68.5#53 > octopi.local Server: 192.168.68.5 Address: 192.168.68.5#53 Name: octopi.local Address: 192.168.68.50 ;; connection timed out; no servers could be reached > pi@octopi:~ $
I see the connection timed out response above (and this takes some time to come up) but I cannot see what or why that is happening. Performing an NSLOOKUP from my mac, provides no such error message and response is instant.
Additional information about your network (Hardware you are trying to connect to, hardware you are trying to connect from, router, access point, used operating systems, ...)
DNS server is PiHole. There is a local DNS entry added for octopi.local. Logs from PiHole show the name resolution is being asked and resolved from local cache on PiHole (which is what you'd expect as it's locally added to the server)