Going back, this issue happens randomly. While I am connected to the VPN network using OpenVPN Access Server, Google randomly redirects me to Google Hongkong or Google Mexico. Again, this happens a lo

I'll face latency issue there as well & most chances are that I'll also face DNS issue there.

What?!? Check the client area, sure enough I had a brand new IP, and my server had been auto-rebooted 36 hours ago. I updated my DNS records and everything came good immediately.

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Might open source the whole thing or make an dns api out of it.

DNS tunnel should actually still work, I just remembered you only need TXT dns requests to get through - even if they go through some internal DNS server.

I tried nslookup lowendtalk.com 8.8.8.8 but got DNS request timeouts.

After configuring everything and changing the DNS stuff, all is well. Although, MXroute is also hosted through OVH, same where my dedicated server is hosted too. I figured, at least if my server crash

My ISP is messing with me a lot & facing too much DNS issues with them.

You can use cloudflare free DNS & update them when monitor detect an issue using their API ;-). Set either a low TTL for DNS or use them as reverse proxy.

You can also use DNSMadeEasy and their DNS failover service. I have used them for 5 years now, and my sites is "never" down, most 1-2 minutes, often less. The DNS fail over service k

I have the DNS switching covered if you're using cloudflare with Uptime Robot or StatusCake.

Will get the other ones added (SolusVM + DNS)

Can you run "dig lowendtalk.com TXT @8.8.8.8" and get a reply? If so DNS tunneling is the way out!

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As for dns, maybe you can try a dnscrypt enabled dns server.

problem is if the connection is going via a proxy it would probably do the DNS lookup with the proxy.

For the DNS auto-switch, you could declare the back-up server as a backup mx for the mail service. Regarding the A/AAAA resource, you could use UptimeRobot + API.

If it allows only HTTP, HTTPS and DNS and only to whitelisted hosts then your chances are pretty bad (unless you manage to get one of your servers whitelisted, then it's easy).