Hello list-

As an MSP, we manage all of our clients over VPN tunnels. Most of our
clients are using the new virtual tunnel interfaces (VTIs), which Spectrum
correctly discovers as a connection between two interfaces. However, some
customers still use legacy cryptomaps, which leave no virtual interfaces to
connect. The problem with this is that we need to connect the "outside"
interface on every remote customer firewall with the "outside" interface on
each of the two VPN terminators here. Spectrum will not allow me to connect
more than one interface to another. However, I'm not sure the best way to
represent these connections.

I considered creating a fanout for each customer that would connect the
customer firewall to the two firewall hosts, something like this:
custa-fw_outside -> fanout
terminator-a_outside -> fanout
terminator-b_outside -> fanout

This works great for one customer, but I cannot connect any more customer
fanouts to the terminators' outside interfaces. I can't create another
fanout on our side either, since Spectrum should not connect two fanouts
together.

I could create one fanout that represents "the Internet" and connect
everything to it like so:
terminator-a_outside -> Internet
terminator-b_outside -> Internet
custa-fw_outside -> Internet
custb-fw_outside -> Internet
custc-fw_outside -> Internet
...

However, I'm concerned what this would do to root cause, since it would look
to Spectrum like one customer could reach another through the "Internet
fanout", which of course isn't true. There are also a couple of customers
that have two firewalls hosting tunnels, but one cannot talk to the other
through us either.

Is there a best practice, or at least some guidance, for this unusual
situation?

Thank you,
Jim


-- 
JIM PFLEGER  |  Application Architect  |  Insight Networking  |  insight.com

o. 480.889.9680 f. 480.889.9599  [email protected]

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