Re: listen for multicast traps

Ah, looks like it's just a case of doing afterwards:

struct ip_mreq multicast_request;
multicast_request.imr_multiaddr.s_addr = inet_addr("239.255.255.255");
multicast_request.imr_interface.s_addr = htonl(INADDR_ANY);
if(setsockopt(transport->sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(void*)&multicast_request, sizeof(multicast_request))<0){
    perror("setsockopt");
    exit(1);
 }

On Thu, Feb 17, 2011 at 2:22 PM, th exterit <[email protected]> wrote:

> Hi there.  I'm writing a trap listener and using netsnmp, obviously.
>
> I want to be able to join a multicast group before I bind the socket in
> order to receive multicast traps.
>
> When I call 'netsnmp_transport_open_server("snmptrapd", "udp:162")' is
> there any option I set prior to this or can I modify the "udp:162" string to
> specify multicast and the multicast address?
>
> Thanks,
> Tom
>

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