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Date: Sat, 26 Sep 2015 20:30:57 +0600
From: Victor Sudakov <vas@mpeks.tomsk.su>
To: freebsd-net@freebsd.org
Subject: Re: transport mode IPSec with Windows 7, static keys
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Victor Sudakov wrote:
> 
> However, FreeBSD+racoon and Windows 7 with its builtin IPsec
> PolicyAgent service work more or less (E: 3des-cbc, A: hmac-sha1) on
> pre-shared secret.
> 
> The only problem I have encountered is that after Windows reboot,
> traffic stops flowing between FreeBSD and Windows until racoon is
> restarted. 
> 
> I wonder if it has anything to do with the net.key.preferred_oldsa
> setting.

The two sysctls:

net.key.preferred_oldsa=0
net.key.blockacq_count=0

seem to fix the reboot problem. Could anyone explain the mechanism? I
have never had to tweak them to get IPsec working between FreeBSD hosts.

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov@sibptus.tomsk.ru