Re: Canon ImageCLASS Color Lasers won't print

*** Problem (mostly) resolved ***

I finally solved most of the most vexing parts of my problem, and as so
often, it is kind of embarrassing. It was an unstable DNS setup in my
network.

My office's LAN is kind of unusual in that we have a whole class C
network (x.y.x.0/24) that is globally routable. It is mostly for
historical reasons; because we were a network hardware manufacturer, I
asked out bandwidth provider for it, and they agreed. And they have let
us keep it. Our security is provided by a Linux system that routes
between our subnet and the internet, and we run iptables filters there.

We have separated name resolution for our domain between inside clients
and outside clients. The server for outside clients is hosted at
Cloudflare and maintained via their web interface. The zone for inside
clients runs in the edge router, with a slave server on our main file
server system. We try to keep the zones synced, and we actually have
most of our internal host names resolved in the "public" zone so that if
users get sloppy and configure the name server on their PC as 1.1.1.1 or
9.9.9.9 everything still works. But somehow the 3 servers (Cloudflare
and our 2 inhouse) were getting out of sync when I made updates to try
new versions.

Once I got the DNS issues squared away, all the Windows, MAC and iPhone
clients started working and stayed working.

The CUPS client on the file server that I would like to use as a spool
pool still does not like the printer, but that will have to wait until
my other fires have been put out.

My takeaway is to add DNS to my daily checklist, specifically checking
for hostnames that have recently been adjusted as well as the 5 most
important ones.

-- 
Lars Poulsen - an old geek in Santa Barbara, California