Friday, September 7, 2018

Puzzling wireless behavior

As the programmer at a small non-profit I'm also the assumed IT guy. Computer stuff is all the same right? sigh

Anyway, we have a small building served by a single Unifi AP-LR, yes it is old. This has been fantastic until recently.

The configuration:

  • We broadcast 2 ssids. One for staff and one for guests.
  • Each network has its own vlan and connects directly to our UTM box.
  • All block actions are logged.
  • The guest network has access only to the internet and no access to any other part of our network.
  • No captive portal.
  • Each wireless network has its own /24 address block.
  • Snort IDS on WAN
  • Transparent Squid Proxy

This has all worked fine until this week.

The symptoms:

  • Some devices work on the guest ssid but others time out when accessing the internet. However,
  • All devices get an ip address.
  • DNS queries work on all devices.
  • Some services and webpages work on the "broken" devices but most do not but DNS is working on the broken pages.
  • The devices that I am testing with are both phones, one android, and one iPhone that fail to connect.
  • Laptops seem to work fine.
  • The devices that fail do work properly on the other ssid.
  • There are no log entries showing traffic from those phones being dropped or blocked. All services seem to be playing nice.
  • The AP also doesn't seem to want to inform the controller so I have no data there. Yes, I know how to ssh in and set-inform.
  • We have plenty of dhcp leases available.

Any ideas? Thanks for your help!

tl;dr

Some devices work on our guest wireless while others simultaneously do not.



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