[rohc] linux constant IP ID field can't be compressed in profile 0x0001?

[Alan Kennington <ak.rohc@topology.org>]

Is there an obvious way to solve the problem of the constant value
of the IP header Identifier field for UDP/IP from linux boxes?
As I read it, RFC 3095, 5.7, p.75, says that the difference of the
IP-ID minus the RTP is encoded with p = 0, which means that the _difference_
may be constant or slowly increasing.

Therefore as I understand it, an IP ID field which is always equal to
zero is incompressible.
Can this be right? If so, this is a black mark against linux.

Cheers,
Alan Kennington.

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