What Stops IPv6 Traffic in a Dual-stack ISP?

Category : Business | Sub Category : News Posted on 2024-03-23 10:29:42

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What Stops IPv6 Traffic in a Dual-stack ISP?

Or rather: what Stops IPv4 Traffic in a Dual-stack setup and faulty IPv6 records?

Hosting providers have (for most) a rather unwanted behavior when it comes to IPv6 DNS defaults for their customers.
The default today and all the way back more than 5 years ago is: a valid AAAA DNS record takes precedence in a Dual-stack setup.

In other words, an A DNS record (ipv4) in combination with a valid (but misconfigured) AAAA DNS record (ipv6) will leave an ipv4 service unreachable in a Dual-stack setup.

If your service does not use IPv6, there is no need for any AAAA DNS record, a simple fix is to remove them (often 2 entries for each service) and your ipv4 service becomes reachable in a Dual-stack setup.

Go!