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i was working for a routing algo protocol in c++ on centos. centos was running on vmware .. i was able to register mcast address 126.96.36.199 when my interfaces card are connected in bridge mode in vmware. but as i connected my centos with cisco router using gns3 cloud i got errors
so overall topolgoy is like
cenots++bridgemode-----bridgemode+centos //able to add into group
centos+--vmnet1-----------+vmnet1(gns3cloud---cisco router) //unable to add into group
cout << "unknown group address"<<endl;
if memcpy((char *) &mcastAddr.sin_addr.s_addr,h->h_addr_list,h->h_length);