Why tunnel between 2 machines with gns does not rise?

Question

linux

GNS3 is installed on two linux machines. Routing between the emulated routers is up, all addresses are registered, linking Source and Dst addresses for the tunnel are available. But the tunnel does not rise. 10.10.10.2, which is registered on the router of the second machine, does not respond from the first one.
tcpdump on linux is generally empty, wareshark on fa0/0 R2 receives only icmp echo request, i.e. packets do not reach the linux machine. How to debug?
Screenshot and settings of one of the machines: (on the second machine everything is the same)

!
interface Tunnel0
 ip address 10.10.10.1 255.255.255.252
 tunnel source 50.60.70.1
 tunnel destination 4.4.4.3
end

ABR#ping 4.4.4.3

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.4.4.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/42/72 m

s

Answer 1

thanks, no longer needed, figured it out.
On one of the machines, an interface was added from the ip tunnel, killed it and it all worked. The question is closed.

Answer 2

Show sh run from both routers.
How do you check that the tunnels are up?
Show the output of sh int tu0