Hi, I've been testing using a 4G service as a backup WAN link in the event that the Main link goes down. I'd chosen ZettaNet. Good pricing. Static IP address. The sites where I will be deploying this solution host servers (mail etc.) and also have IPsec VPN's with other sites; so the static IP address made failover more straightforward. Unfortunately the ZettaNet service has been unavailable a couple of times now over the past few months and they've not been able to provide an explanation so far for the most recent outage. So I'm starting to look around for possible alternative service providers. So far the other service providers I've contacted are only able to provide a dynamic IP address. At the very least this will make DNS updates and IPsec configuration more involved. Questions 1. Has anybody done this where you're hosting internal servers etc. What service provider are you using? Do they provide a static or dynamic IP address? 2. Any comments on using DDNS in A records on DNS and likewise for creating IPsec VPN's. Is it feasible? Thanks Regards, Vaughan