troubleshooting Question

Transition from single home to multihomed solution

Avatar of nabeel92
nabeel92 asked on
RoutersNetwork ArchitectureDisaster Recovery
8 Comments1 Solution511 ViewsLast Modified:
Hi there,
I've attached my network diagram where I've tried to give the big picture of a 'Dual-homed Single ISP' solution since their traceroute meets at the same device on the very next hop. How can i make the transition of this network to a multihomed network. I've thought that I can use a Router (keeping things simple for now) and have it connected to the internet using another ISP. Connect the inside interface of that router to my DMZ and LAN switches separately ? Would that be correct solution ?

Now, secondly (and this is a potential flaw i see ) all the major services are hosted on the DMZ; the DMZ has a public subnet. Our ISP (Telstra) is responsible for routing traffic to this DMZ subnet statically (not BGP) . Say when I connect the router that i've proposed in the diagram attached to another ISP and connect its inside interface to DMZ, how is that ISP going to find out on how to route to this DMZ subnet; this is obviously assuming a case of failure occuring at first ISP and we need to use this second ISP. I can route traffic from inside--> to internet fine; but how about traffic coming from outside the internet to this DMZ ? How is this second provider going to know about it about this public DMZ subnet. Which things are in our control and which things are not in our control in such scenarios is also another query ?

Any further info. I can provide, let me know. Your help will be appreciated -:)

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 1 Answer and 8 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 8 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros