CURRENT: ipfw: problems with timeouts and worse network performance

[Vladimir Zakharov]

On Fri, May 20, 2016, Jan Bramkamp wrote:
> On 20/05/16 14:54, Vladimir Zakharov wrote:
> > Hello
> >
> > On Fri, May 20, 2016, O. Hartmann wrote:
> >> I reported earlier about broken pipes in ssh sessions to remote hosts,
> >> which occur on an erratic basis. i'm investigating this problem now and
> >> it seems that it is also ipfw-related, but I'm not sure. This problem
> >> is present since a couple of weeks now.
> >
> > Maybe this could help...
> >
> > I've also experienced problems with broken pipes in ssh sessions some
> > time ago. Setting in sysctl.conf
> >
> > net.inet.ip.fw.dyn_ack_lifetime=3600
> >
> > fixed problem for me. I didn't experiment with the value though. So,
> > possibly, changing default value (300s) to 1 hour is overkill :).
> 
> By default the OpenSSH SSH client is configured to use TCP keepalives. 
> Those should produce enough packets at a short enough interval to keep 
> the dynamic IPFW state established.
> 
> Does your traffic pass through libalias?
I guess not. How can I be sure?

-- 
Regards,                 | "In theory there is no difference between theory
  Vladimir Zakharov      | and practice. In practice there is."- Yogi Berra