[geeks] Network Nightmare

[md.benson at gmail.com]

Thanks for the suggestion. Ibll read up on that and see if itbs something
we can resolve easily. Any idea of solutions that could be applied?

Sent from my iPhone

> On 20 Jul 2020, at 13:28, Jonathan Katz <jon at jonworld.com> wrote:
>
> o;?Sounds like a potential spanning-tree loop among your switches.
>
>> On Mon, 20 Jul 2020 at 11:33, <md.benson at gmail.com> wrote:
>>
>> Hi,
>>
>> We are having a major issue at $work with or LAN just completely flaking
>> out
>> or slowing up to a crawl. It usually happens in the morning when people
>> start
>> coming into work and booting up PCs (which means Ib m not usually on site
>> to
>> analyse it). Usually disconnecting one of the Area switches from the
>> Central
>> switch will calm it down, but it can reoccur several times.
>>
>> We have one central (unmanaged) switch that has the 2 main area switches
>> (also
>> unmanaged) spurred off it as well as a WiFi AP and a switch on a Fibre
line
>> (via copper to fibre media converters). The main switch then connects to a
>> Firebox T35 via a single line to the main switch.
>>
>> The T35, as well as vetting our LAN traffic, routes off-site traffic to 3
>> WANs
>> depending if itb s for a specific Cloud service (uses RDP Terminal
services
>> via a permanent VPN over a dedicated VDSL line), VoIP (uses itb s own VDSL
>> line to prevent internet traffic compromising call quality) or general
>> Internet (has a general use VDSL line of itb s own).
>>
>> We have 2 servers (in different places, one in a rack with a dedicated
>> switch), about 20 client PCs, 2 WiFi APs (with minimal traffic as they are
>> only accessible through equipment I allow). We will be introducing 18 VoIP
>> phones also in the next week or so so as you can imagine LAN outages or
>> blackouts are going to be a major headache.
>>
>> The infrastructure wiring is all Cat6a (STP) and is less than 3 years old.
>>
>> Hereb s a link to a diagram:
>>
>> https://www.dropbox.com/s/j4qf3evxqy31xcb/network-2020.png?dl=0
>>
>> I understand the situation is very vague but I am at a loss to know how to
>> begin diagnosis of this kind of issue. I canb t just pull up logs for
>> something at link level with a setup like this, and I lack the expertise
to
>> know the go-to tools or methods in a situation like this.
>>
>> My only possible notion thus far is we might be overwhelming the Firewall
>> (we
>> are near itb s recommended limits) but the situation seems more like
>> something in the LAN is getting stuck in a loop or a bunfight or
something.
>>
>> All help and suggestions gratefully received.
>>
>> b
>>
>> Mark
>> _______________________________________________
>> GEEKS:  http://www.sunhelp.org/mailman/listinfo/geeks
>>
> --
> -Jon
> +44 7792 149029
> _______________________________________________
> GEEKS:  http://www.sunhelp.org/mailman/listinfo/geeks