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function in6_selectroute fail


Hello:
      I want to add ipv6 to my eth . Stack is bsd_tcpip,  I configured
"IPv6 support" and "Multicast routing support" and "Thread for IPv6
routing".
      I traced "sendto": bsd_sendit -> sosend -> udp6_send ->
udp6_output -> in6_selectsrc -> in6_selectif -> in6_selectroute.

      And found "in6_selectroute" (in6_src.c) returns error, errno is
EHOSTUNREACH.
		
                if (ro->ro_rt == NULL){
			error = EHOSTUNREACH;
		}

I don't know how to set v6 route for eth0 , does IPv6 routing thread
do this work ?

Thanks for anything .

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