[cisco-voip] offline network - using NAT/PAT to connect to the outside world

[Charles Goldsmith]

Be careful of SIP connections from your offline network getting to
production devices.  You don't want your Unity Connection to start
reporting MWI status back to your production network or if using Single
Inbox, to sync with your Exchange.

My advice is to not let your offline network connect to anything on the
public network, other than a couple of devices for you to go in and manage
it from (ie, your workstation) and for specific tests.

On Wed, Jul 19, 2017 at 1:28 PM, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:

>
> A while back we had a good discussion about offline network upgrade
> preparation. A few people mentioned using NAT/PAT in order to connect to
> servers that would be too difficult to replicate in the off-line network.
>
> I'm trying to get my head around this and thought I'd share this
> simplified plan that I want to start off with.
>
> In the offline network we have:
>
>
> *         a layer 3 switch that does the routing for the offline network
>
> *         a router which does some other tasks like NTP, DHCP, etc.
>
> *         layer 3 switch is connected to router
>
> Here's what I envision:
>
>
> *         connect the router to a public network, i.e. network 45
>
> *         configure NAT/PAT on the router so that all the inside networks
> (on the switch) are patted using the public network address
>
> *         configure static routes on the router for all inside networks
> (on the switch) pointing to the switch
>
> *         configure static routes on the router for specific outside
> networks pointing network 45 gw
>
> *         configure static routes on the switch for specific outside
> networks pointing to the router interface
>
> The biggest issue here is that we have replicated many of our public
> networks in this offline network and there can't be any chance of that
> leaking.
>
> But I'm pretty sure this would prevent that.
>
> Thoughts? Gotchas?
>
> Lelio
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst, Network Infrastructure
> Computing and Communications Services (CCS)
> University of Guelph
>
> 519-824-4120 Ext 56354
> lelio at uoguelph.ca
> www.uoguelph.ca/ccs
> Room 037, Animal Science and Nutrition Building
> Guelph, Ontario, N1G 2W1
>
>
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>
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