[zeromq-dev] multicast chat working only with DHCP networks

[Andrew Simpson]

by 0MQ multicast, I meant that I am using zeroMQ to make a chat program that is using multicast addresses to send out to other nodes on a local network.  this is a fairly simple application.  When it attempts to bind to the multicast address, it gives the aforementioned error, unless I'm on a proper network.

I'll see if I can make a small test version of this program.  At the very least I can probably post up the relevant parts of the code.
Thanks!
On Sunday, May 11, 2014 2:41 PM, Pieter Hintjens <ph at imatix.com> wrote:
 
You don't need a nameserver for multicast to work, no. However when
>you say "0MQ multicast", what do you mean exactly?
>
>It's useful to make a minimal test case for your problem and provide
>us that source code.
>
>-Pieter
>
>On Sun, May 11, 2014 at 5:28 PM, Andrew Simpson <simpsonar77 at yahoo.com> wrote:
>> I am able to get it working without DHCP.  If I disable DHCP on the comptuer
>> and set the IP address manually to the same IP as I'd get from DHCP and then
>> set the nameserver in /etc/resolv.conf the same way that DHCP assigned (in
>> my case:  nameserver 192.168.2.1) then the chat program works.  So I'm
>> assuming that I need a nameserver on the network for multicast to work?
>> (note:  my knowledge of networking is a bit limited)
>> On , Andrew Simpson <simpsonar77 at yahoo.com> wrote:
>>
>> The Error that I get when not on DHCP:
>>
>>>>>TRACE     = org.zeromq.ZMQ$Socket.bind(Native Method)
>> org.zeromq.ZMQException: Invalid argument(0x16)
>>         at org.zeromq.ZMQ$Socket.bind(Native Method)
>>
>> On Sunday, May 11, 2014 2:52 PM, Andrew Simpson <simpsonar77 at yahoo.com>
>> wrote:
>>
>> #ip route
>> 172.16.18.0/24 dev vmnet1  proto kernel  scope link  src 172.16.18.1
>> 192.168.159.0/24 dev vmnet8  proto kernel  scope link  src 192.168.159.1
>> 192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
>> 224.0.0.0/4 dev eth0  proto static  scope link
>> default via 172.20.20.1 dev eth0  proto static
>>
>>
>> On Sunday, May 11, 2014 2:45 PM, Arnaud Loonstra <arnaud at sphaero.org> wrote:
>>
>> On 05/11/2014 04:26 PM, Andrew Simpson wrote:
>>> I have a 0MQ multicast chat program that only appears to work when the
>>> computer is on a network with a DHCP server.  When I connect into a
>>> simple, flat network (say 192.168.5.x) with 2 computers, chat does not
>>> work.  Adding them back onto the network running DHCP, and getting their
>>> IPs from DHCP, everything works fine.
>>>
>>> I'm on RHEL.6.  I have disabled iptables.  Any suggestions as to what's
>>> different when using DHCP versus non-DHCP?
>>>
>>> Thanks!
>>
>> A routing table?
>>
>> --
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>>
>> g:
>> http://github.com/sphaero
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