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Re: kern/52554: IPv6 connections not routing to default gateway

The following reply was made to PR kern/52554; it has been noted by GNATS.

From: Roy Bixler <>
Subject: Re: kern/52554: IPv6 connections not routing to default gateway
Date: Fri, 29 Sep 2017 11:00:35 -0600

 On Fri, Sep 29, 2017 at 07:56:13AM -0600, Roy Bixler wrote:
 > On Thu, Sep 28, 2017 at 09:55:01PM +0000, Ryota Ozaki wrote:
 > >  Oh sorry, I suppose to see packets of telnet by tcpdump on br0 and eth0
 > >  of Linux. I suspected that a SYN packet is broken and filtered out on the
 > >  interfaces for some reasons. And also we may see a SYNACK packet on
 > >  the interfaces if a SYN packet reaches the server.
 > I wasn't thinking the same way, since I have had success with IPv6 on
 > guests running different operating systems, like NetBSD 7.1.  I also
 > have success with IPv6 on NetBSD 8 when connecting to other hosts on
 > the same LAN.  That only changes when I try to connect outside the
 > LAN.
 > I decided to try something different, which is an "ssh" connection
 > with IPv6 to a host outside of the LAN.  I run tcpdump locally and on
 > the remote host.  What appears to happen is that the NetBSD 8 host
 > sends its SYN packets, the remote host receives them and tries to
 > reply, but NetBSD 8 never sees the replies.
 Because of this, I started to wonder if there's just some coincidence
 at play here and NetBSD 8 somehow grabs a bad router when it does its
 DHCP negotiation.  I have a working NetBSD 7.1. setup which has a
 different IPv6 router so, after booting up the NetBSD 8 system, I
 manually changed the default router to match the NetBSD 7.1 system.
 Then I started getting replies to my IPv6 connections outside the
 LAN.  So, the problem appears to be a purely a local one. :/
 Roy Bixler <>
 "The fundamental principle of science, the definition almost, is this: the
 sole test of the validity of any idea is experiment."
 -- Richard P. Feynman

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