On 9 April 2015 at 12:10, Kengo NAKAHARA <k-nakah...@iij.ad.jp> wrote: > Hi, > > On 2015/04/03 16:14, Takahiro HAYASHI wrote: >> It seems that IFF_POINTTOPOINT interfaces like tun and gif cannot >> receive ipv6 packets. >> This occurs on NetBSD/amd64 -current since Feb 27 2015. >> >> For example, establishing gif tunnnel between 2 hosts. >> >> [host1] <---> [host2] >> 192.168.0.1 192.168.0.2 ipv4 address of real interface >> fd00::1 fd00::2 gif address >> >> When I ping6, a host can send ICMPv6 ECHO(128), but the other host >> returns ICMPv6 DST_UNREACH(1) code UNREACH_ADDR(3) to pinging host. > > I think the reason of this issue is below commit: > > http://www.nerv.org/netbsd/?q=id:20150226T095446Z.75354d997222ae09acc944ba1c6cf573c3ea724b > > This commit changes the route entry for gif as describe below > ========== before ========== > Internet6: > Destination Gateway Flags > Refs Use Mtu Interface > fd00::2 link#13 UHL > 0 0 - lo0 > ========== before ========== > ========== after ========== > Internet6: > Destination Gateway Flags > Refs Use Mtu Interface > fd00::2 fd00::2 UH > - - - gif0 > ========== after ========== > > This route change caused the function flow change in ip6_input(), in > paticular the below line > http://nxr.netbsd.org/xref/src/sys/netinet6/ip6_input.c#497 > After above commit, this statement become false, and then, the packets > is discarded through line#565. > > I found the above reason, however I have no idea to fix this issue... >
Could you file a PR? Justin
