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Fail to ping iot device's global IPv6 address

Max

I am working on nrf51 iot sdk. I have created a IPv6 tunnel in HE and is able to ping the gateway as follows:

root@raspberrypi:/home/pi# ping6 2001:xxx:18:xxx::1
PING 2001:xxx:18:xxx::1(2001:xxx:18:xxx::1) 56 data bytes    
64 bytes from 2001:xxx:18:xxx::1: icmp_seq=1 ttl=64 time=352 ms   
64 bytes from 2001:xxx:18:xxx::1: icmp_seq=2 ttl=64 time=337 ms

But I am unable to ping the global IPv6 address of the cloud/coap/data_source example.

I am able to ping the local address as follows:

root@raspberrypi:/home/pi# ping6 -I bt0 fe80::254:2cff:fe1c:xxxx    
PING fe80::254:2cff:fe1c:xxxx(fe80::254:2cff:fe1c:xxxx) from fe80::215:83ff:fee3:xxxx bt0: 56 data bytes    
64 bytes from fe80::254:2cff:fe1c:xxxx: icmp_seq=1 ttl=64 time=96.1 ms    
64 bytes from fe80::254:2cff:fe1c:xxxx: icmp_seq=2 ttl=64 time=282 ms

My radvd.conf setting is:

interface bt0    
{    
    AdvSendAdvert on;    
    prefix 2001:xxx:19:xxx::/64    
    {         
        AdvOnLink off;
        AdvAutonomous on;   
        AdvRouterAddr on;    
    };   
};
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