Weird ipv6 traceroute problem

pilax

Newbie

Posts: 7

« on: September 17, 2010, 07:53:31 am »

Hello

I set up two ipv6 tunnels on two OpenBSD gateway.
The machines behind one gateway are able to surf any ipv6 websites.
All the traceroute work.
Like this
D:\>tracert -d -6 ipv6.he.net Tracing route to ipv6.he.net [2001:470:0:64::2] over a maximum of 30 hops: 1 <1 ms <1 ms <1 ms 2001:470:1f12:3f8::2 2 33 ms 33 ms 33 ms 2001:470:1f12:3f8::1 3 33 ms 32 ms 38 ms 2001:470:0:7b::1 4 39 ms 43 ms 48 ms 2001:470:0:42::1 5 107 ms 112 ms 107 ms 2001:470:0:3e::1 6 168 ms 168 ms 173 ms 2001:470:0:10e::1 7 176 ms 188 ms 176 ms 2001:470:0:18d::1 8 180 ms 177 ms 180 ms 2001:470:0:2d::1 9 176 ms 177 ms 177 ms 2001:470:0:64::2 Trace complete.

But with the second gateway I'm not able to surf ipv6 site and the traceroute are always one hop !!
Like this
PS C:\Users\Administrator> tracert -d -6 ipv6.google.com Tracing route to ipv6.l.google.com [2a00:1450:8002::69] over a maximum of 30 hops: 1 72 ms 71 ms 72 ms 2a00:1450:8002::69

Or this one
PS C:\Users\Administrator> tracert -d -6 ipv6.he.net Tracing route to ipv6.he.net [2001:470:0:64::2] over a maximum of 30 hops: 1 203 ms 203 ms 202 ms 2001:470:0:64::2

The only difference between the two OpenBSD gateway is the kernel (4.5 and 4.7)
The working one is 4.5.

I check all the configuration but I'm stuck now... Sad

Any ideas ?

Thanks


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cholzhauer

Hero Member

Posts: 2075

Re: Weird ipv6 traceroute problem

« Reply #1 on: September 17, 2010, 08:09:43 am »

And you're sure that other than the different versions of OpenBSD, the rest of the config is the same?


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pilax

Newbie

Posts: 7

Re: Weird ipv6 traceroute problem

« Reply #2 on: September 17, 2010, 08:34:46 am »

Oh my yes !! Angry

I test with simplest configurations.
But yes on one gateway the ext_if the a pppoe kernel one.

Gateway 1 :
/etc/rc.local
ifconfig gif0 tunnel 80.124.186.106 216.66.84.42
ifconfig gif0 inet6 alias 2001:470:1f12:3f8::2 2001:470:1f12:3f8::1 prefixlen 128
route -n add -inet6 default 2001:470:1f12:3f8::1
ifconfig vr0 inet6 2001:470:1f12:3f8::3
rtadvd vr0 gif0

/etc/pf.conf
pass quick on vr0 inet6
pass quick on gif0 inet6
pass quick on $ext_if proto ipv6

Gateway 2 :
/etc/rc.local
ifconfig gif0 tunnel 86.220.166.144 216.66.84.42
ifconfig gif0 inet6 alias 2001:470:1f12:41a::2 2001:470:1f12:41a::1 prefixlen 128
route -n add -inet6 default 2001:470:1f12:41a::1
ifconfig xl1 inet6 alias 2001:470:1f12:41a::3
rtadvd xl1 gif0

/etc/pf.conf
pass quick on xl1 inet6
pass quick on gif0 inet6
pass quick on $ext_if proto ipv6

The weirdest thing is the one hop traceroute...


« Last Edit: September 17, 2010, 09:13:17 am by pilax »	Logged

pilax

Newbie

Posts: 7

Re: Weird ipv6 traceroute problem

« Reply #3 on: September 17, 2010, 09:44:31 pm »

I still looking...

Does anyone use he tunnel with an OpenBSD pppoe gateway ?

Any clue on the one hop traceroute ? Huh


« Last Edit: September 17, 2010, 09:48:07 pm by pilax »	Logged

pilax

Newbie

Posts: 7

Re: Weird ipv6 traceroute problem

« Reply #4 on: September 17, 2010, 10:28:33 pm »

I made some progress...

The weird traceroute problem is because this line option in pf.conf
match in all scrub (min-ttl 254 max-mss 1440)
Without this option, traceroute runs perfectly.

Now I discovered someting interesting when I get there : http://www.data.jp/ipv6/ipv6check.php
IPv6 check @ Hart Hart Computer, Inc. is located in Tokyo, Japan You are IPv6 connection Your IP address ---- "2001:470:1f0a:19a4:3103:e920:2a2d:dd27" Your Hostname ---- "2001:470:1f0a:19a4:3103:e920:2a2d:dd27"

My problem is only with http://ipv6.he.net ! Shocked

I'm not the only one with this issue :
http://www.tunnelbroker.net/forums/index.php?topic=1185.0

Still digging...


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