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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
 tunnel destination

This command set translates to:

    ip tunnel add Tunnel0 \
        mode gre \
        local \

Any questions? No questions.