ipv4 node unable to bing ipv6 node in my dualstack topology .... i wonder if i miss some thing

[auoobe_april]

i design a dual stack topolgy with three routers one in the middle is running ipv4 only and the others in the sides is running ipv6 made a tunnele so host in ipv6 only networks can ping but when i try to ping ipv6 host from ipv4 network i get a massege distenation unreachble ? can you help me to translate
 

[vivek srivastava]

ipv4 host cannot ping ipv6 host.

[ishan2106]

Hi auoobe_april ,

can you share the result ? also ur interface config ?

did you ping with 'ping6' command or simple 'ping' ?

Please elaborate so that we can try to get your ans.

tnx