This is plausible. I think ubnt sends broadcast traffic at MCS0. Not
sure how it handles multicast. If everyone was in the same layer2
domain a heavy broadcast traffic could affect the whole system. Maybe
the customer moving 6-10mbps was malfunctioning and broadcasting something.
In general it's safe to block all multicast and only allow it where you
need to make OSPF connections. Broadcast can be limited to 10kbps per
customer with no issue. The only broadcast they need to function is an
ARP for their default gateway and a DHCP discover. After initial
discovery the DHCP traffic switches to unicast. Not sure what tools
ubnt gives you for filtering that, but ideally you'd block multicast and
limit broadcast at every CPE.
On 6/18/2021 9:33 AM, Daniel White wrote:
Sounds like a broadcast storm to me. What is the topology of your
network? Routers at each tower, VLANs, etc.?
Are you filtering multicast and broadcast traffic at the CPE/customer
premises?
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Daniel White
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Jan-GAMs <mailto:[email protected]>
June 17, 2021 at 23:47
We had a strange outage on one of our networks yesterday. At first
we thought it was one customer. The symptom was very low to
non-existent internet traffic. The complaint was my internet is not
working!
Upon testing I found that the complaining customer had for a speed
test about 0.14kbps for a speed to it's AP. So I went to their AP
and tested the speed back at them, it was about the same unusually
slow speed. Then I tested that AP to another AP and that speed was
about the same slow speed. So then I tested another customer and
another and then ended up testing just about everyone in the whole
network. Everyone was operating at an unusually slow speedtest to
any other device of about 0.1kbps to 0kbps. The whole network was
down and yet the UISP was indicating everyone was up and operating
with even some traffic in the 6-10 Mbps range which I'm sure was fake
traffic as none of the devices tested would pass anything above a few
kbps.
A reboot of every device resolved the issue.
Our gear is Ubiquiti and I'm wondering has anyone else using Ubiquiti
been experiencing anything like what I just described? Is there a
known cause?
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