Re: Dealing with ICMPv6 network unreachable.

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, Apr 03, 2015 at 09:41:51AM +0100, Roy Marples wrote:
> On Fri, 2015-04-03 at 09:58 +0200, Manuel Bouyer wrote:
> > On Thu, Apr 02, 2015 at 08:09:49PM -0400, Greg Troxel wrote:
> > > [...]
> > >   It seems that the proper response of TCP to net/host unreachable is
> > >   arguable.  In the case you mention, it's best to abort, but a
> > >   transient unreachable situation on a TCP connection shouldn't kill the
> > >   connection.
> > 
> > I fully agree. I just got my ssh connections to a linux host killed
> > only because I unplugged/replugged the ethernet cable of said linux box.
> > That's very annoying.
> 
> I would argue that's correct behaviour because the addresses will become
> non functional when you take the cable out. In the IPv6 case on NetBSD
> the addresses will be marked as detached and then tentative when the
> cable is plugged back in. I think in the Linux case the addresses are
> just removed. With dhcpcd running it will remove the addresses. There is
> no guarantee the same network will be plugged back in.

But you don't know until you get another address (or the same address
back). You shouldn't loose established TCP connection when a switch is
reloaded. I really don't think that's the correct behavior.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--