Friday, February 8, 2019

One ISP Handoff - 2 WAN devices

All,

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I know you are going to rip me apart for this - I haven't done a whole lot of networking in the past year or two and am extremely rusty and can't wrap my head around it with everything else at the moment.

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Here is the scenario - I have a new site coming online next Friday. I typically have the Fiber directly terminated on the site firewall without any other internet facing devices.

I was just informed this morning for this new site that our phone guys need a WAN connection for an Edgemarc device. I do not want to NAT this through our firewall. I have a /29 block from the ISP on one subnet, which includes their gateway so, 5 usable IPs.

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I believe I can just terminate the ISP on a switch and then our firewall and edgemarc device off of that - but I am lost on the configuration of it. Should it just be a layer 2 switch? if I put all 3 devices on one vlan - what else do I need to do(minus hardening and management)? Do I need routes on the switch?

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The last time something similar came up - it was a layer 3 switch which needed multiple wan subnets, which I do not have here. and the timeline isn't going to allow a change order to the ISP.

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I know this is basic math - Go easy.. or take your shots with a bit of an answer. :)



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