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SD-WAN is probably a lot easier. What equipment do you have currently? There are some firewalls and routers that have backup connectivity as a feature. I have ir configured in my Cisco routers using a variety of advanced configuration features such as IP SLA and reliable static routing, use of routing protocols over VPN connections, policy based routing, etc. Not trivial.
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<blockquote>
backup WiMax signal 
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WiMax has not been available in the US for years -- So let's start with where your located ? &nbsp;<br />
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But, if you prefer not to say and want Wireless options, look at something like the CradlePoint or Sierra Wireless products that offer LTE based fallback.
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We are in Chicago<br />
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We have sonicwall soho
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So WiMax is not an option unless you have some private carrier with it. &nbsp;<br />
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LTE is not a clean fallback as you will have a different set of IPs verses your ISP connection, but you will have the better possibility of some connectivity given that nine time out of ten interruptions can be attributed to the last mile connectivity and it has a habit of taking out all paths not just the primary path. &nbsp;<br />
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Some people however find that a Metro-E link and a Cable Modem follow diverse enough routing to be good backups for each other.<br />
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I would look at the two vendors I listed and put them between your Sonicwall and the ISP for Wireless... &nbsp;<br />
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You may need to update / upgrade your Sonicwall to get anything to work. &nbsp;<br />
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<a href="http://help.sonicwall.com/help/sw/eng/7634/7/2/0/content/Policies_Network_FailoverLB_Snwls.htm" rel="ugc">http://help.sonicwall.com/help/sw/eng/7634/7/2/0/content/Policies_Network_FailoverLB_Snwls.htm</a>
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al4629740

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Where does the idea of SDWAN fit in?
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SD = Software Defined&quot; the current networking buzzwords, it should mean something that has an API that can provide desired state rather than hoping that your changes have taken (or rolled back), but it usually means something like <a href="http://https://www.bigleaf.net/" rel="ugc">bigleaf</a> these days. The bigleaf boxes have little do with SD, they work by creating VPN tunnels over your individual connections to a bigleaf datacenter which is where your public addresses (provided by bigleaf) are announced, the technique is not new, but it is quite nicely packaged.<br />
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The &quot;traditional&quot; way of doing this would be to have PI space and BGP with your multiple ISPs.<br />
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Unless you &quot;need&quot; to have your public addresses stay the same, I would go with a NAT firewall that can handle multiple WAN connections and a mthod of failing over outbound traffic, you could then use duynamic DNS to make your external address(es) update as required, or have Active DNS where your DNS provider probes the possible addresses and updates A records etc when a change happens.
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Is SDWAN handled with a hardware appliance or is it in the cloud on the providers side.
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You'd have local hardware with cloud managment (think Meraki, Viptela, Fortinet, Riverbed). &nbsp;This could be either proprietary physical hardware or software on VM. &nbsp;A lot of carriers have their own &quot;flavor&quot; which is generally just a re-branded delivery of some other SD-WAN vendor's equipment. &nbsp;The difference between direct management v hosted is the same as always, cost.
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We have a location that needs to have a backup WiMax signal in the event that our primary internet goes down. &nbsp;It seems our provider is suggesting SD-WAN along with the backup line. &nbsp;Is this necessary? &nbsp;Is there another way to get a device that cuts over to the backup line to supply bandwidth when the primary goes down. &nbsp;Or should I consider SD-WAN along with the backup line? &nbsp;Any comments?
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We have a location that needs to have a backup WiMax signal in the event that our primary internet goes down.  It seems our provider is suggesting SD-WAN along with the backup line.  Is this necessary?  Is there another way to get a device that cuts over to the backup line to supply bandwidth when the primary goes down.  Or should I consider SD-WAN along with the backup line?  Any comments?

Ideas on how to cutover to a backup line when primary goes down

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.

Networking Hardware-Other

Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.