It'll break our GeoIP | It's on our roadmap | IPv6 is just a fad | IPv6 addresses are too long to remember | We would have to rewrite our entire application to support it |
No one else has deployed it | Github doesn't support IPv6 | There's no certification track | Can't we just buy more IPv4 addresses? | Larger headers are less efficient |
IPv6 is slower than IPv4 | We forgot to include IPv6 in our last RFP | IPv6 isn't an Internet Standard yet | It'll make it easier for the government to track me | |
Our recursive DNS can't handle the extra load | I don't want to lose the security provided by NAT | Vendor bugs | Our Dynamic DNS doesn't support it | We don't need that many addresses |
There's no ROI on deploying IPv6 | I don't want to expose my MAC address | What do you mean I have to wrap an IP in square brackets? | We have IPv6, but we just want to keep things simple | Too many people have broken IPv6 stacks |