Has there been resolution on this? I get this error now and then, too.
On Tuesday, August 2, 2016 at 12:25:09 PM UTC-6, Jakob Borg wrote:
>
>
> On 2 aug. 2016, at 15:19, CN47 <akrc...@gmail.com <javascript:>> wrote:
>
> I'm working on an API that should connect via IPv4 and Ipv6 to a server
> via UDP packets and send/receive information to/from that server.
>
> Please see the below example. This seems to work even though I've
> specified "udp" and not "udp6" (Both server and client address are local to
> a network)
>
> package main
>
> import (
> "fmt"
> "net"
> )
>
> func CheckError(err error) {
> if err != nil {
> fmt.Println("Error: " , err)
> }
> }
>
> func main() {
> ServerAddr,err :=
> net.ResolveUDPAddr("udp","[0:0:0:0:0:ffff:c0a8:cd36]:5400")
> CheckError(err)
>
> LocalAddr, err := net.ResolveUDPAddr("udp",
> "[0:0:0:0:0:ffff:c0a8:130]:5400")
> CheckError(err)
>
> Conn, err := net.DialUDP("udp", LocalAddr, ServerAddr)
> CheckError(err)
>
> defer Conn.Close()
> }
>
> However, once I replace those "udp" strings with "udp6" as indicated in
> the documentation, I get an error from the DialUDP() method "dial udp6
> 192.168.1.48:5400->192.168.205.54:5400: bind: can't assign requested
> address".
>
> For what it's worth, the code works if I replace those ipv6 strings with
> their ipv4 strings and use "udp4" instead of "udp".
>
> Can someone explain why udp6 doesn't seem to work?
>
>
> Those are IPv4-mapped IPv6 addresses, which is to say regular IPv4
> addresses expressed in IPv6 syntax for compatibility purposes. You are
> using an IPv4 connection, which is why "udp" and "udp4" work but "udp6"
> doesn't.
>
> //jb
>
>
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