There's no ROI on deploying IPv6 | We would have to rewrite our entire application to support it | What's IPv6? | Our Dynamic DNS doesn't support it | We can use RFC6598 |
It's not supported by Google Compute | None of our customers want it | It's on our roadmap | IPv6 is slower than IPv4 | Too many people have broken IPv6 stacks |
Our recursive DNS can't handle the extra load | Github doesn't support IPv6 | Can't we just buy more IPv4 addresses? | Our vendor doesn't support it | |
IPv6 just isn't a priority | I don't want to lose the security provided by NAT | We'll deploy IPv6 right after we deploy DNSSEC | Our business intelligence team can't even parse IPv4 logfiles | Our DDOS mitigation platform can't monitor IPv6 |
We don't have a lab to test it | My transit provider doesn't support IPv6 | It'll break our GeoIP | IPv6 is a security risk | IPv6 is just a fad |