Begin forwarded message:
> From: Robert Engels <reng...@ix.netcom.com>
> Date: August 26, 2019 at 7:38:20 PM CDT
> To: Tanner Ryan <he...@tannerryan.ca>
> Subject: Re: [go-nuts] Multiple interface addresses and UDPConn.WriteToUDP
>
> If the network is set up properly the kernel should chose the correct network
> interface based on the destination IP address.
>
> The only time this doesn’t apply is with multicast packets so as to not flood
> the network. In this case you set the interface you want to send on.
>
>> On Aug 26, 2019, at 3:47 PM, 'Tanner Ryan' via golang-nuts
>> <golang-nuts@googlegroups.com> wrote:
>>
>> Hi,
>>
>> I was hoping someone could help me with an issue. I have a simple UDP server
>> that listens on a specific port, responding with a message back.
>>
>> conn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4(0, 0, 0, 0),
>> Port: *port})
>>
>> When reading messages, I use the source address for sending a response back.
>>
>> n, sourceAddr, err := conn.ReadFromUDP(buff)
>> conn.WriteToUDP(reply, sourceAddr)
>>
>> When my WAN interface has a single IPv4 address, the server can read and
>> respond properly. When there's an additional IPv4 address on the WAN,
>> requests to the second IP are successful received, but the response is not
>> received by the original sender.
>>
>> Is there another way to fix this other than explicitly calling ListenUDP on
>> the two addresses?
>>
>>
>> Best,
>> Tanner
>> --
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