Re: Minor IPSec bug + solution

Martin Bouzek [off-list ref] wrote:

I was setting up an VPN via IPSec in kernel 2.6.x on IPv4 and found the
following bug. It is not possible to set up an IPComp/ESP tunnel with
IPComp set as mandatory. The following setup works fine for me:

You can never set IPComp as mandatory because ipcomp_output() will not
compress anything that is incompressible.

function. For tunnels it returns 

tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);

The check is correct as it is.  Internal states must never match any
required transform.
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