[ovs-discuss] Can not modify the nw_proto / ip_proto field
Ben Pfaff
blp at ovn.org
Sun Aug 28 16:48:42 UTC 2016
On Sat, Aug 27, 2016 at 08:00:15PM +0200, Richard Mayers wrote:
> I am trying to modify the ip_proto field using an SET_FIELD action.
> However, it seems that OVS does not allow that, and ip_porto is
> only-read field. error message:
>
> destination field nw_proto is not writable
>
> Why is this like that? In the documentation of ovs-ofctl and my
> openflow controller says that all the match fields can be used as an
> action field. Is there a way I could fix that? I am using OVS 2.5.90.
It's because there's no sensible way to translate, for example, UDP to
TCP, and reinterpreting the bytes as a new protocol wouldn't fit well
into the OVS caching model. Given that it's unlikely to be useful for
those reasons, we don't support it.
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