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Linux and Cisco IOS tunnels.

Among another tunnels Cisco IOS supports IPIP and GRE. Essentially, Cisco setup is subset of options, available for Linux. Let us consider the simplest example: 

interface Tunnel0
 tunnel mode gre ip
 tunnel source 10.10.14.1
 tunnel destination 10.10.13.2

This command set translates to: 

    ip tunnel add Tunnel0 \
        mode gre \
        local 10.10.14.1 \
        remote 10.10.13.2

Any questions? No questions.