处理丢失的IPv6连接的正确方法

Question

I'm currently looking for a way to properly handle missing IPv6 connectivity.

The use case is, that i resolve a DNS record which might contain AAAA records and connect to each of the resolved IPs. Now the system running that code might not have IPv6 connectivity.

So i'm looking for the proper way to handle this and ignore these records, but only if the host can't connect anyway.

My current approach is:

if ip.To4() == nil && err.(*net.OpError).Err.(*os.SyscallError).Err == syscall.EHOSTUNREACH {
    log.Info("ignoring unreachable IPv6 address")
    continue
}

But i'm not sure, if there is a better way.

Answer 1

一个简单的解决方案是使用net.Dialer （将DualStack设置为true然后仅使用名称使用Dial()然后让库为您处理“高兴的眼球”。