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my laptop automatically got ipv6 - strange

Shadow Hawkins on Thursday, 15 May 2008 06:58:14

Hi, I've recently setup a sixxs tunnel with aiccu on my desktop computer @ home (opensuse 10.3). Everything works fine from the desktop, but know i'm puzzled: I discoverd that my laptop system (ubuntu 8.04), which is in the same local ipv4 net, has a sixxs device enabled, too AND i can successfully do a ping6/traceroute6 to sixxs.net. This is very confusing as i did not setup ANY ipv6 tunneling stuff on the laptop or routing on the desktop, and it seems to use the tunnels endpoint ipv6 address (at least the first hop on a traceroute6 is the tunnelbroker endpoint). Anyone can point out whats happening here?

my laptop automatically got ipv6 - strange

Shadow Hawkins on Thursday, 15 May 2008 13:59:53

Is your desktop normally your internet router for the laptop? Did you install radvd perhaps? (giving more info, like OS information on the desktop and laptop are usually very helpful btw) -- edwin

my laptop automatically got ipv6 - strange

Shadow Hawkins on Thursday, 15 May 2008 17:00:02

The Desktop system, which is my tunnelendpoint, is a opensuse 10.3 running aiccu on a dynamic tunnel. radvd is definetely not installed and not running. I use the system as a terminal server, i.e I use FreeNX to login under gnome, so I dont have much network/routing stuff intalled beyond the default opensuse desktop install. I somewhat got a "stange" network setup: The Desktop is connected via ethernet cable to a switch/wlan/dslmodem/router combo device, but which does NOT server as a DSL modem. Instead, i got another DSL router connected to a free switchport (on the combo box). The combo box however serves as a wlan-to-ethernet bridge and i blame the strange behavious to this bridge. My laptop, a quite basic xubuntu 8.04 install without any special networking/routing/ipv6 packages; use it mainly to connect with NX to the desktop via wlan. These parts form my whole homenetwork. The REALLY strange thing is that ubuntu brings up a network interface named sixxs - the same name the aiccu client uses BUT on the completely other desktop system. I emphasize, i definetly got no aiccu or any other tunnel software running on the laptop. ifconfig on the laptop (Hostname Ganymed): root@Ganymed:/home/timo# ifconfig sixxs Link encap:UNSPEC Hardware Adresse 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet6-Adresse: 2a01:198:200:a0::2/64 GÃ¼ltigkeitsbereich:Global inet6-Adresse: fe80::98:200:a0:2/64 GÃ¼ltigkeitsbereich:Verbindung UP PUNKTZUPUNKT RUNNING NOARP MULTICAST MTU:1280 Metrik:1 RX packets:801 errors:0 dropped:0 overruns:0 frame:0 TX packets:760 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 SendewarteschlangenlÃ¤nge:500 RX bytes:231597 (226.1 KB) TX bytes:70940 (69.2 KB) wlan0 Link encap:Ethernet Hardware Adresse 00:80:5a:33:8b:2f inet Adresse:192.168.1.33 Bcast:192.168.1.255 Maske:255.255.255.0 inet6-Adresse: fe80::280:5aff:fe33:8b2f/64 GÃ¼ltigkeitsbereich:Verbindung UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1 RX packets:1231921 errors:0 dropped:0 overruns:0 frame:0 TX packets:1725085 errors:1710 dropped:1710 overruns:0 carrier:0 Kollisionen:57327 SendewarteschlangenlÃ¤nge:1000 RX bytes:643309481 (613.5 MB) TX bytes:134429349 (128.2 MB) Interrupt:9 Basisadresse:0xc000 ---- ifconfig desktop machine (hostname orion): br0 Protokoll:Ethernet Hardware Adresse 00:1B:FC:89:F8:2A inet Adresse:192.168.1.10 Bcast:192.168.1.255 Maske:255.255.255.0 inet6 Adresse: fe80::21b:fcff:fe89:f82a/64 GÃ¼ltigkeitsbereich:Verbindung UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:24767178 errors:0 dropped:0 overruns:0 frame:0 TX packets:16485994 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 SendewarteschlangenlÃ¤nge:0 RX bytes:26472014572 (25245.6 Mb) TX bytes:7787130183 (7426.3 Mb) eth0 Protokoll:Ethernet Hardware Adresse 00:1B:FC:89:F8:2A inet6 Adresse: fe80::21b:fcff:fe89:f82a/64 GÃ¼ltigkeitsbereich:Verbindung UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:24701126 errors:0 dropped:0 overruns:0 frame:0 TX packets:15096571 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 SendewarteschlangenlÃ¤nge:1000 RX bytes:26841372367 (25597.9 Mb) TX bytes:5850334612 (5579.3 Mb) Interrupt:19 Basisadresse:0x8000 lo Protokoll:Lokale Schleife inet Adresse:127.0.0.1 Maske:255.0.0.0 inet6 Adresse: ::1/128 GÃ¼ltigkeitsbereich:Maschine UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:10415607 errors:0 dropped:0 overruns:0 frame:0 TX packets:10415607 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 SendewarteschlangenlÃ¤nge:0 RX bytes:3192061616 (3044.1 Mb) TX bytes:3192061616 (3044.1 Mb) sixxs Protokoll:UNSPEC Hardware Adresse 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet6 Adresse: 2a01:198:200:a0::2/64 GÃ¼ltigkeitsbereich:Global inet6 Adresse: fe80::98:200:a0:2/64 GÃ¼ltigkeitsbereich:Verbindung UP PUNKTZUPUNKT RUNNING NOARP MULTICAST MTU:1280 Metric:1 RX packets:318573 errors:0 dropped:0 overruns:0 frame:0 TX packets:119285 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 SendewarteschlangenlÃ¤nge:500 RX bytes:393524763 (375.2 Mb) TX bytes:7854192 (7.4 Mb) As you can see, i use a soft bridge on the desktop using brctl. The eth0 (with some tapX devices mainly for virtualization) is attached to br0. I tried to capture pakets on both machines via tcpdump -i sixxs and then do some webbrowsing the sixxs.net page (which stated i use ipv6 on BOTH machines with the SAME endpoint ip) on the other machine but with no result.So obviously the traffic generated is not seen by the contrary machine. I'm neither a network nor ipv6 pro, my only guess is something happening within the wlan-ethernet bridge which seems to relay the ipv6 packets. but how does the laptop (ubuntu) notice this and brings up a linux ethernet device?

my laptop automatically got ipv6 - strange

Jeroen Massar SixXS Staff

on Thursday, 15 May 2008 17:11:20

Try 'ps aux' on your laptop and also (as root) check "netstat -anp", I am fairly sure something is listening on a port 5072 and that that something is 'aiccu'. The sixxs tunnel you have there definitely is a Tun/Tap interface and the local addres is also configured in the way that aiccu configures it. Running a tunnel on two hosts at the same time, magically works as for every packet sent the tunnel will switch over to the other host and the response packets, which generally follow directly, will then come back to the host who just send them. You might also want to do a tcpdump to show yourself that your laptop is sending ayiya packets outbound. Of course the most important thing is that you should learn how your machine works and what is running on it.

my laptop automatically got ipv6 - strange

Shadow Hawkins on Friday, 23 May 2008 17:52:16

Do you have a subnet configured on you main computer? What are the IPv6 addresses used by the desktop and the portable? If there is a computer or other device in the subnet configured to transmit 'router advertisements', then any computer in the subnet that has IPv6 configured will get an IPv6 address. From what have observed most operating systems using IPv6 default to auto-configuring an IPv6 address when it receives the subnet prefix by router advertisement.

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