I am looking at adding a second internet connection for my business and connecting them to a 1812 router. They will be different types through different providers to give real redundancy. How would you suggest configuring this for true redundancy/failover? Using OER or just by routing protocol? What about security? Would you use the router as the firewall or add an ASA inside the router to provide a separate firewall and VPN device?
I think that you cannot use neither routing protocols nor OER, because you will not be able to use a same subnet (prefix) with both ISPs. That would require BGP, An AS number, and possibly PI address space, all things that are very complicated to obtain.
So I guess, like it is becoming more and more common now, you can in practice only use NAT to both providers for redundancy. A router is perfectly adequate to do that, and is an excellent firewall too. Still, some people like the ASA better.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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