[erlang-questions] windows multicast

[Sergej Jurecko]

You probably can’t listen on the same port from two erlang instances.

Sergej

On 11 May 2014, at 13:25, Jörg Maushake <joerg.maushake@REDACTED> wrote:

> Thank You for this detailled reply.
> Does your windows code work on two nodes started on one machine?
> On my machine im still getting eaddrinuse when trying to run the code in two nodes.
> I did the following, to verify the code used for windows:
> 
>  Mc = {230, 0, 0, 1},
>  Src = {192,168,2,101},
>  %% 1> inet:getiflist().
>  %% {ok,["169.254.82.58","192.168.2.101","127.0.0.1"]} 
>  %% 2>
>  Opts = [ { active, true },
>           { ip, Src },
>           { multicast_loop, true },
>           { reuseaddr, true },
>           list 
>         ],
>  { ok, RecvSocket } = gen_udp:open (Port, Opts),
>  inet:setopts(RecvSocket, [{ add_membership, { Mc, Src }}]),
> 
>  And it works when starting a node. But when starting another node (on the same maching) im still getting
>  Address in use:
> 
> !! eaddrinuse 
> 
>  im using R16B03-1
> 
> 
>> Gesendet: Sonntag, 11. Mai 2014 um 07:55 Uhr
>> Von: "Sergej Jurecko" <sergej.jurecko@REDACTED>
>> An: "Jörg Maushake" <joerg.maushake@REDACTED>
>> Cc: "Gokhan Boranalp" <kunthar@REDACTED>, Erlang <erlang-questions@REDACTED>
>> Betreff: Re: [erlang-questions] windows multicast
>> 
>> Multicast in erlang is kind of weird. 
>> I actually have slightly different code for different platforms. This is code from r14 days. I’m not sure if it works any differently now, but I did have issues finding the right combination of parameters to get it to work. Nothing worked universally across all platforms. 
>> 
>> Mc = multicast address
>> Src = source ip of local interface
>> 
>> Windows:
>> {ok, SockSrc} = gen_udp:open(Port, [{reuseaddr,true}, {ip, Src}, {multicast_ttl, 1}, {multicast_loop, false}, binary]),
>> inet:setopts(SockSrc, [{add_membership, {Mc, Src}}]);
>> 
>> linux,freebsd:
>> 
>> {ok, SockSrc} = gen_udp:open(Port, [{reuseaddr,true}, {ip, {0,0,0,0}}, {add_membership, {Mc, Src}},{active,true}, binary,{recbuf, 1024*1024}]);
>> 
>> osx:
>> 
>> {ok, SockSrc} = gen_udp:open(Port, [{reuseaddr,true}, {ip, Mc}, {multicast_ttl, 1}, {multicast_loop, false},{recbuf, 1024*1024}, binary]),
>> inet:setopts(SockSrc, [{add_membership, {Mc, {0,0,0,0}}}])
>> 
>> 
>> Sergej
>> 
>> On 10 May 2014, at 21:37, Jörg Maushake <joerg.maushake@REDACTED> wrote:
>> 
>>>  Restarting windows does not change anything.
>>>  I deployed the code to macbook where it works.
>>>  It seems to be a windows issue
>>>  otp_release: R16B03-1
>>> 
>>> Gesendet: Samstag, 10. Mai 2014 um 17:18 Uhr
>>> Von: "Gokhan Boranalp" <kunthar@REDACTED>
>>> An: "Jörg Maushake" <joerg.maushake@REDACTED>
>>> Cc: Erlang <erlang-questions@REDACTED>
>>> Betreff: Re: [erlang-questions] windows multicast
>>> Restart your computer.
>>> 
>>> On Sat, May 10, 2014 at 5:58 PM, "Jörg Maushake" <joerg.maushake@REDACTED> wrote:
>>>> Hi list,
>>>> I am using erlang on windows 7.
>>>> 
>>>> When i start a multicast (the code is from nodefinder) like so:
>>>> Opts = [ { active, true },
>>>> { ip, {230, 0, 0, 1} },
>>>> { add_membership, { {230, 0, 0, 1}, { 0, 0, 0, 0 } } },
>>>> { multicast_loop, true },
>>>> { reuseaddr, true },
>>>> list
>>>> ],
>>>> { ok, RecvSocket } = gen_udp:open (4321, Opts),
>>>> 
>>>> i get this {error,eaddrnotavail}
>>>> 
>>>> Removing the tuple { ip, {230, 0, 0, 1} } from Opts seems to work!
>>>> But when i then start another node on the same machine the error i get is:
>>>> {error,eaddrinuse}
>>>> 
>>>> (The multicast group and port works with java )
>>>> 
>>>> Any suggestions ?
>>>> 
>>>> _______________________________________________
>>>> erlang-questions mailing list
>>>> erlang-questions@REDACTED
>>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>> 
>>> 
>>> 
>>> 
>>> --
>>> BR,
>>> \|/ Kunthar
>>> _______________________________________________
>>> erlang-questions mailing list
>>> erlang-questions@REDACTED
>>> http://erlang.org/mailman/listinfo/erlang-questions
>> 
>>