[strongSwan] IPComp - what this message mean?

[Kamil Jońca]

I try to set up strongswan on my openwrt router, and it is almost done.
The only thing I want to do is compression.
I got:
--8<---------------cut here---------------start------------->8---
daemon.info syslog: 04[IKE] unable to allocate a CPI from kernel, IPComp disabled
--8<---------------cut here---------------end--------------->8---
What can it be, and is it possible to do?
KJ

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