[191183] in North American Network Operators' Group
Re: Charter HFC Engineer?
daemon@ATHENA.MIT.EDU (Gabriel Kuri)
Fri Aug 26 15:35:48 2016
X-Original-To: nanog@nanog.org
In-Reply-To: <2b15a790-64eb-b269-abb1-3343f72e516c@tiedyenetworks.com>
From: Gabriel Kuri <gkuri@ieee.org>
Date: Fri, 26 Aug 2016 11:27:49 -0700
To: Mike <mike-nanog@tiedyenetworks.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
Mike,
SNMPv3 uses TCP.
Also, I never said I had a daemon listening on port 161, the cable modem
would simply reboot if it saw a TCP SYN packet destined to port 161 to IP
address space sitting behind my cable modem.
FYI - Charter engineers responded to me indicating it's a known bug with
this Ubee modem and Ubee is working on a new revision of firmware to fix
the bug.
On Fri, Aug 26, 2016 at 11:11 AM, Mike <mike-nanog@tiedyenetworks.com>
wrote:
>
>
> On 08/24/2016 10:39 PM, Gabriel Kuri wrote:
>
>> I was able to confirm my Ubee
>> was susceptible to this bug and would reboot by simply telneting to IP
>> space on port 161 behind the modem. I figured my random reboots were
>> related to random people port scanning my IP space throughout the day. I
>> called support to let them know and got them to bump it up to their
>> manager, who then referred it to a "technical specialist" that ended up
>> blocking port 161 on my cable modem.
>>
> Not to be unhelpful, but SNMP is a UDP protocol, you can't "telnet" to
> port 161 and be talking to the snmp deamon on the device because it's not
> listening for that. If you do get a connection, there's really something
> wrong....
>
>
> --
> Mike Ireton
> WillitsOnline LLC
>
>
