Forums Bug Reports Cannot resolve IPv6 addresses

Hi,

First, I should note that I do not actually have IPv6 connectivity here, so this isn't exactly a critical issue. But I thought it's still worth reporting:

It appears my mIRC cannot resolve hostnames to IPv6 addresses. Both /server -6 and /dns -6 fail to do so, yet resolving the same name works fine with "nslookup", e.g.:


(As you can see, I'm using Google's DNS service.)

When I do /dns -6 www.google.com I get:


If I use -4 or -46 (or no options), I get the IPv4 result correctly.

Interestingly, mIRC has no problem doing the reverse lookup:


Versions:
mIRC 7.52
Windows 8.1 Pro (version 6.3.9600)

Thanks

Thanks for your bug report. I have not been able to reproduce this issue so far. When I use "/dns -6 www.google.com", mIRC resolves this to an IPv6 IP address as expected. mIRC calls the standard Windows API getaddrinfo() to resolve named addresses to an IP address, so it can't do anything more than use the returned results. Unfortunately, I cannot think of a reason why you would not get results with it.

I have the same issue on my end, with either an ISP that doesn't support IPv6, or when using an access point that doesn't support IPv6.

I believe nslookup (cmd window) works because it conducts a raw records request via IPv4, as a self-contained program independent of getaddrinfo(). You could choose to write your own DNS client to conduct direct queries.