IP-IP Tunnel does not work

[Covaliciuc Piotr]

Hi,
I want to connect two MikroTik Routers by IPIP-tunnel. I have configured
routers as follows:

Configuration of MT1:
interface ipip add local-address=15.15.15.15 remote-address=20.20.20.20
interface enable ipip1
ip address add interface=ipip1 address=172.16.1.1/24
ip route add dst-address=20.20.20.20 gateway=172.16.1.2

15.15.15.15 - This is Public IP-address on the Ether1

Configuration of MT2:
interface ipip add local-address=20.20.20.20 remote-address=15.15.15.15
interface enable ipip1
ip address add interface=ipip1 address=172.16.1.2/24
ip route add dst-address=15.15.15.15 gateway=172.16.1.1

20.20.20.20 - This is Public IP-address on the Ether1

However, the tunnel does not work. PING on router MT1 to 172.16.1.2:
"172.16.1.2 ping timeout"


Whether you know, why tunnel does not work? Tell me, please, where I was
mistaken?

Thank you.
Peter