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Multicast address config lost

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Operating Systems Solaris Multicast address config lost
# 1  
Old 11-15-2009
Multicast address config lost
On Solaris OS, We use the following command to config the multicast address for NIC in order to process the multicast packets:
# route add 228.228.228.228 10.101.10.2
Where " 228.228.228.228 " is the multicast for specified NIC ip 10.101.10.2 .
Also use the netstat -nr, the above set could been displayed as the following:
Code:
Routing Table: IPv4
  Destination           Gateway           Flags  Ref     Use     Interface 
-------------------- -------------------- ----- ----- ---------- --------- 
228.228.228.228             10.101.10.2          U         1       1020 e1000g0

In our program, we use the function:
setsockopt(sockfd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq)) to
join the multicast group and receive the packets.
At the begining, all runs ok. But after about two days later, the multicast address 228.228.228.228 was lost, which cause our program run unnormmally.
What confuse us is that the above phenomena do not exist on the other UNIX/Linux OS. anyone can fix it,thanks.
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LEARN ABOUT CENTOS

rdma_join_multicast

RDMA_JOIN_MULTICAST(3)					   Librdmacm Programmer's Manual				    RDMA_JOIN_MULTICAST(3)

NAME

       rdma_join_multicast - Joins a multicast group.

SYNOPSIS

       #include <rdma/rdma_cma.h>

       int rdma_join_multicast (struct rdma_cm_id *id, struct sockaddr *addr, void *context);

ARGUMENTS

       id	   Communication identifier associated with the request.

       addr	   Multicast address identifying the group to join.

       context	   User-defined context associated with the join request.

DESCRIPTION

       Joins a multicast group and attaches an associated QP to the group.

RETURN VALUE

       Returns 0 on success, or -1 on error.  If an error occurs, errno will be set to indicate the failure reason.

NOTES

       Before  joining	a  multicast group, the rdma_cm_id must be bound to an RDMA device by calling rdma_bind_addr or rdma_resolve_addr.  Use of
       rdma_resolve_addr requires the local routing tables to resolve the multicast address to an RDMA device, unless a specific source address is
       provided.  The user must call rdma_leave_multicast to leave the multicast group and release any multicast resources.  After the join opera-
       tion completes, if a QP is associated with the rdma_cm_id, it is automatically attached to the multicast group when the multicast event	is
       retrieved  by  the  user.  Otherwise, the user is responsible for calling ibv_attach_mcast to bind the QP to the multicast group.  The join
       context is returned to the user through the private_data field in the rdma_cm_event.

SEE ALSO

       rdma_leave_multicast(3), rdma_bind_addr(3), rdma_resolve_addr(3), rdma_create_qp(3), rdma_get_cm_event(3)

librdmacm							    2008-01-02						    RDMA_JOIN_MULTICAST(3)