Diagnosis: printer was not plugged in.
Recommendation: plug printer in.
@neil@mastodon.neilzone.co.uk I had that this week - they "tidied" all the wiring and equipment - they did a neat job, all fixed to wall, and cabled - modem, FireBrick, switch, WiFi controller, all good.
I could see on the video call (I did not have to go round) the power button on the modem was out... It was mounted such that one could not see the "lights".
That was the problem...
@revk@toot.me.uk @neil@mastodon.neilzone.co.uk Years ago.
SalesDirector: I thought I told you to test the demo kit beforehand
Me: I did, tested it when I set it up and confirmed it was behaving as expected.
Me: Walks into meeting room, wait where's the switch
SalesDirector: cabling looked messy so I hid it behind the cabinet
Me: Rechecks cabling finds power cable to switch had come out (It was a small DC powered switch)
Me: Plugs power cable back into network switch, few momnets later Demo kit starts working again.
@Dragon@toast.dragon2611.net @revk@toot.me.uk @neil@mastodon.neilzone.co.uk non-IT member of staff at a customer thought that an ethernet cable looked untidy and plugged the loose end into a spare ethernet socket.
Layer 2 loop ensues, brings down the whole network (yes, they should've had STP turned on, but it seems they didn't).
The offending member of staff apparently looked quite sheepish when the tech finally tracked the loop down to the room they were still in :)
@steve@mastodon.nexusuk.org @Dragon@toast.dragon2611.net @neil@mastodon.neilzone.co.uk LOL...
My son did that at the office, and went to lunch.
Also we had a gigabit link from office to datacentre at ethernet level, it was all gigabit at the time.
Shall we say, err, "fun".
Yeh...
@revk@toot.me.uk @Dragon@toast.dragon2611.net @neil@mastodon.neilzone.co.uk Back when I was at university, I fired up dhcpd on the computer society's firewall to serve their internal network and then went to my morning lectures. Turns out the dhcpd man page was a bit wrong and when I configured it to not hand out leases on the external NIC, it sent refusals instead. Turns out it sent refusals faster than the uni's real DHCP server could respond and took out the entire uni network. Back in those days it was a more-or-less flat /16 across the site.
@steve@mastodon.nexusuk.org @revk@toot.me.uk @Dragon@toast.dragon2611.net @neil@mastodon.neilzone.co.uk oh, are we doing DHCP/university network war stories? đ
So, back before wifi was a thing, we'd have a few thousand freshers turn up each year with PCs with no NIC in them, wanting to connect to them to the halls of residence network.
The local bricks and mortar computer shop would happily sell them cheap chinese NE2000 clones. Except this one year they'd got really cheap ones, that all had the same MAC address đł
đ
Neil Brown
RevK :verified_r:
