We are having massive network wide issues since upgrading our cnPilot routers to 4.7.4-R19 .
SYMPTOMS: Devices don’t get DHCP addresses, cnPilots vanish from the cloud, config changes can’t be made, software updated/downgrades can’t be made, and eventually routers crash.
The core issues seems to stem from a massive crit_techsup file generated in /etc/cambium
This issue prevents any firmware updates/downgrades from happening. It prevents any config changes from being made. And it eventually crashes the router and requires a truck roll to fix.
We have been talking to Cambium support for over 3 weeks and get only “This is a critical issue internally”, yet as we’re having a literal core meltdown there isn’t even so much as a work around or solution provided yet.
I’ve e-mailed and talked to on the phone our RTM on Thursday and have not heard anything further from him.
Where can I take this further up the chain in Cambium, and is anyone else seeing this issue?
Apparently between certain versions, a factory reset was was needed. Whether it merely needed a fresh config (thereby omitting erroneous parameters), or it actually changed something more permanently, I cannot confirm. that being said, every time I get a new router I upgrade the firmware and factory reset the config, then load a config template.I can’t recall the version past which need this procedure was needed (check release notes).
Yes I am running 4.7.4-R19. I’ll check the output of those commands when I get a gap. What is your output?
I would check that your MTUs are correct (at least 1518) and that you don’t have any fragmentation through your network. If there is, then set the desired MTU in the WAN interface settings (accounting for TCP overhead and the protocol over your network. I take it you don’t have a management network? I only use VLANs, but at the very least you should have a management network on a VLAN.