hi >What are you actually planning? Likely there is a different way to >achieve it TO send an IGMP request to join a multicast goup ,the only information i had is the rt_socket ,and i need to send directly the igmp packet without passing by the ip level , that mean to use directly the xmit_start function ,to use it i need rtnet_device pointer. you see the problem i had ? So I have resolved the problem by adding a new function in "rtdev.c", its role is to get rtnet_device by local_ip adress.it work well. The only constrain that we must specify the local ip adress when using multicast.
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