Task 7.2 IPv6 Tunneling

hi everybody.
during session i met some difficulties.
tunnel interface on one router was up/up on another up/down.
any comments
R2#
interface tunnel 0
tunnel mode gre ip
tunnel source 136.1.29.2
tunnel destination 136.1.4.4
ipv6 address fec0::1/64

R4#
interface tunnel 0
tunnel mode gre ip
tunnel destination 136.1.29.2
tunnel source 136.1.4.4
ipv6 address fec0::4/64


on R2 interface tunnel 0 is up/up, on R4 is up/down

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