MA statewide 911 outage and resolved shortly afterwards?

[Eric Kuhnke]

Via the Outages list, info from the Boston police department followed about
an hour later by a "it's fixed" message.

Did anyone in MA receive a push notification from their cellular carrier?


Quotation from original posts follows

"I have a report this 3pm Tue, hour from the authenticated FB page of the
Boston PD,
that 9-1-1 service is out statewide in Mass; they're handling it as a Code
2 AHOD;
flag down a cruiser if you need help.

"""
9-11 is currently down statewide.

If you are experiencing an emergency please pull a Fire Box.

If you need assistance, please reach out to your local Boston Police
District station.

Boston Police will be patrolling with their blue lights activated for high
visibility.
Please approach an officer if you need assistance:

Downtown A-1: (617) 343-4240
Charlestown A-15: (617) 343-4888
East Boston A-7: (617) 343-4220
Roxbury B-2: (617) 343-4270
Mattapan B-3: (617) 343-4700
South Boston C-6: (617) 343-4730
Dorchester C-11: (617) 343-4330
South End D-4: (617) 343-4250
Allston/Brighton D-14: (617) 343-4260
Roslindale/ West Roxbury E-5: (617) 343-4560
Jamaica Plain E-13: (617) 343-5630
Hyde Park E-18: (617) 343-5600



911 Operating System is back up and running

CANCEL 9-11 is currently down statewide.

If you are experiencing an emergency please pull a Fire Box.

If you need assistance, please reach out to your local Boston Police
District station.

Boston Police will be patrolling with their blue lights activated for high
visibility.

Please approach an officer if you need assistance:

Downtown A-1: (617) 343-4240

Charlestown A-15: (617) 343-4888

East Boston A-7: (617) 343-4220

Roxbury B-2: (617) 343-4270

Mattapan B-3: (617) 343-4700

South Boston C-6: (617) 343-4730

Dorchester C-11: (617) 343-4330

South End D-4: (617) 343-4250

Allston/Brighton D-14: (617) 343-4260

Roslindale/ West Roxbury E-5: (617) 343-4560

Jamaica Plain E-13: (617) 343-5630

Hyde Park E-18: (617) 343-5600

Re: TCP MSS clamping in PROPER way (incoming and outgoing traffic)

[Volkan SALiH]

Thanks Mr. Brandon for the response/feedback. Rgrds


17.06.2024 22:08 tarihinde Brandon Martin yazdı:
Is something out of your control also breaking PMTU discovery (e.g. 
blocking all ICMP traffic)?  With working PMTU discovery, this issue 
should resolve itself in the ingress direction.


You should also set the MTU properly on your PPPoE tunnel interface.  
If the setup inherits properly from the parent interface's MTU, this 
should again be automatic, but I've observed a lot of PPPoE stacks 
don't necessarily do that (not that I've used PPPoE in a hot minute).  
That will get mean PMTU discovery between things on your LAN and the 
Internet happens right at your Internet edge in the egress direction 
and therefore doesn't incur Internet latencies.  If the "clamp MSS to 
PMTU" is working, this probably means you have it right since that's 
usually where the rule gets its PMTU (not actual end-to-end PMTUD), 
but I don't know Microtik for sure.


Clamping the MSS to the known PTMU will fix the opposite direction in 
cases where PMTUD is broken.  That's basically why it exists.