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Tunnel setup: options

Command ip tunnel add has several additional options.

ipip and sit tunnels have no more options. gre tunnels are more complicated:

Actually, these GRE options can be set separately for input and output directions by prefixing corresponding keywords with letter i or o. F.e. icsum orders to accept only packets with correct checksum and ocsum means, that our host will calculate and send checksum.

Command ip tunnel add is not the only operation, which can be made with tunnels. Certainly, you may get short help page with:

    ip tunnel help

Besides that, you may view list of installed tunnels with the help of command:

    ip tunnel ls
Also you may look at statistics:
    ip -s tunnel ls Cisco
where Cisco is name of tunnel device. Command
    ip tunnel del Cisco
destroys tunnel Cisco. And, finally,
    ip tunnel change Cisco mode sit local ME remote HE ttl 32
changes its parameters.


next up previous contents
Next: Differences 2.2 and 2.0 Up: ip-tunnels Previous: Tunnel setup: basics   Contents
Martin A. Brown 2003-03-14