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Matt Harris wrote on 7/31/2019 9:46 AM:<br>
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<div dir="ltr">On Wed, Jul 31, 2019 at 9:21 AM Shaun Dombrosky
<<a href="mailto:SDombrosky@blackfoot.com"
moz-do-not-send="true">SDombrosky@blackfoot.com</a>>
wrote:<br>
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<p class="MsoNormal">Good Morning,</p>
<p class="MsoNormal">First time NANOG poster, apologies
if I breach etiquette.</p>
<p class="MsoNormal">Does anyone have any first-hand
data on how much data a small-medium business (SMB)
can expect to consume in a failover scenario over a
4G/LTE connection? Retail, under 50 head count, using
PoS, maybe cloud accounting software, general internet
activity, 8 hour time period. Wonder if anyone is
using a Cradlepoint or SD-WAN solution that could pull
a few quick numbers from a dashboard for me. I
haven’t had much luck in my searches.</p>
<p class="MsoNormal">Appreciate any info anyone can
provide.</p>
<p class="MsoNormal">Thanks,</p>
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<div>Hey Shaun,</div>
<div>I'd recommend pulling that data from the device normally
facing their internet connection. Does it support netflow or
even just basic snmp statistics that you could graph?
Ostensibly the traffic level would be the same regardless of
whether using an LTE backup connection or the primary
internet connection unless you somehow prohibited certain
traffic when on LTE. Ultimately though, your best bet is
going to be to get real stats over the course of a couple of
weeks and then you'll understand better the traffic patterns
based on time of day, day of the week, etc, as well, as this
is likely relevant. </div>
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<div>Good luck! </div>
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100% agree with Matt. Something also to keep in mind is the SMB's
peak data rates. The primary (I assume ethernet) uplink may have a
sub 10ms latency and 100Mbps or greater data rate while the LTE
connection is probably several times slower in terms of bandwidth
and latency. If designing a failover connection, customer
expectations may need to be managed: internet access may be up, but
will be noticeably degraded when on LTE. A backup cable connection
may be better for VoIP or other latency/jitter sensitive
applications and of course anything that relies on a static IP
(server, vpn, etc) will probably break if the primary connection is
down. Would be a good idea to test the failover connection during a
few different time periods to gauge employee experience.<br>
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--Blake<br>
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