Arch Linux

mind_the_gap

Member

Registered: 2010-07-27

Posts: 14

Can't get ipv6 connectivity outside LAN

Hi there,

a new arch system has been set up by me and now I try to get IPv6 working. Sixxs is my tunnel provider and it did work on my previous (Ubuntu 10.04) system. So in general it should be possible :-). I installed the aiccu package from the AUR and if I do "aiccu start" it gets all the correct tunnel data. Testing things with "aiccu test" shows that everything, but outbound connections, works. I can ping myself, but test 6 (Ping the IPv6 Remote/PoP Inner Tunnel Endpoint), 7 (Traceroute6 to the central SixXS machine) and 8 (Traceroute6 to (www.kame.net)) fail. Test 6 gives the following hint:

### If the previous test was succesful then this could be both
### a firewalling and a routing/interface problem

It seems that the sixxs interface is configured correctlyt, ifconfig shows (the *'s are replacements by me):

sixxs     Link encap:UNSPEC  HWaddr C0-A8-02-56-00-00-00-00-00-00-00-00-00-00-00-00  
          inet6 addr: fe80::c0a8:256/64 Scope:Link
          inet6 addr: 2001:6f8:***:***::2/64 Scope:Global
          UP POINTOPOINT RUNNING NOARP  MTU:1280  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

Unfortunately, there is not much experience with ip tables, but this is the output from "route":

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     *               255.255.255.0   U     0      0        0 eth0
default         arcor.easybox   0.0.0.0         UG    0      0        0 eth0

And this is the output from "ip -f inet6 route show":

2001:6f8:***:***::/64 via :: dev sixxs  proto kernel  metric 256  mtu 1280 advmss 1220 hoplimit 0
fe80::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 0
fe80::/64 via :: dev sixxs  proto kernel  metric 256  mtu 1280 advmss 1220 hoplimit 0
default via 2001:6f8:***:***::1 dev sixxs  metric 1024  mtu 1280 advmss 1220 hoplimit 0

The configuration from /etc/aiccu.conf is tha following:

username ****
password ****

protocol tic
server tic.sixxs.net
ipv6_interface sixxs
tunnel_id ****
verbose true
daemonize true
automatic true
requiretls false
pidfile /var/run/aiccu.pid
defaultroute true
makebeats true
behindnat true

I am behind a NAT which connects me to the internet. Do you have any hints where to look else? Should it work by default or am I missing some settings?

Furthermore I need to use the teredo protocol with meredo, but this is likely another issue (as running meredo does not affect the general ipv6 situation with aiccu for me).

Edit: After executing

ip route add ::/0 dev sixxs

I could get sometimes a connection. For a ping6 the best was about 50% package loss. I found this on the wiki pake for manual 6in4 tunnels. So it seems that it actually has something to do with routing and which routes are created by the aiccu -- so this is not yet resolved.

Thanks in advance, regards,
Tom

Last edited by mind_the_gap (2010-12-13 22:34:14)

smayer

Member

Registered: 2010-08-07

Posts: 13

Re: Can't get ipv6 connectivity outside LAN

have you tried using the default settings? I'm behind several NATs and my sixxs tunnel works with the following aiccu.conf:

username ....
password ....

ipv6_interface sixxs
verbose false
daemonize true
automatic true
requiretls false

nothing more.

mind_the_gap

Member

Registered: 2010-07-27

Posts: 14

Re: Can't get ipv6 connectivity outside LAN

Thanks for posting your conig, smayer. Unfortunately I got the same result as before

--- 2001:6f8:***:***::1 ping statistics ---
3 packets transmitted, 1 received, 66% packet loss, time 2008ms
rtt min/avg/max/mdev = 29.139/29.139/29.139/0.000 ms

Some packet get through -- strange. My router is probably alright, since it did work on Ubuntu two weeks ago.

I tried the same config with an ArchLinux on my notebook. It is connected via wlan to the same router. There happens exactly the same -- packet loss. Well, either my router is not working correcly for about two weeks now or my arch setups have both some problems. I'll try this on another machine.

Edit: I tried it on another machine in this LAN -- Ubuntu 10.10. The same result there -- so it is probably not arch or my configuration. I'll exchange the router and see what happens.

Edit: It seems to work now. After I have disable intrusion detection and firewalls on my router (I'll fine tune that) the packet loss is gone. So sorry for the spam here :-)

Last edited by mind_the_gap (2010-12-16 00:21:01)