Hi,
I'm trying to set an IPv6 tunnel but the lack of documentation
especially about the sit devices makes it a bit difficult.
So here is the problem:
The G6bone gave me the prefix 3ffe:304:123::/48
The prefix of the G6bone is 3ffe:304:101::/48
This how i should theorically set up the tunnel:
Myself <---Tunnel---> G6bone
IPv6 address: IPv6 add:
3ffe:304:101:111:13:1:0:2/124
3ffe:304:101:111:13:1:0:1/124
IPv4 address: IPv4 add
123.123.123.123 194.57.138.60
First question:
Why does the end of the tunnel on my side has an IPv6 address which
belongs to the G6bone domain?
Which interface will have this IPv6 add?
e.g. do I have to make an ifconfig eth0 add
3ffe:314:101:111:13:1:0:2/124 ? or ifconfig sit0 add
3ffe:314:101:111:13:1:0:2/124 ?
Here is what I've done to set up the tunnel (I've read this in
mailing-lists archives but I didn't understand everything):
#ifconfig eth0 3ffe:304:123::1111/48
#ifconfig sit0 up
#ifconfig sit0 tunnel ::194.57.138.60
#ifconfig sit1 up
#ifconfig
eth0 Link encap:Ethernet HWaddr 00:C0:4F:DD:8A:5D
inet addr:123.123.123.123 Bcast:123.123.123.???
Mask:255.255.255.224
inet6 addr: fe80::2c0:4fff:fedd:8a5d/10 Scope:Link
inet6 addr: 3ffe:304:113::1111/48 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2882 errors:0 dropped:0 overruns:0 frame:0
TX packets:168 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:10 Base address:0x250
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:3924 Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
sit0 Link encap:IPv6-in-IPv4
inet6 addr: ::127.0.0.1/96 Scope:Unknown
inet6 addr: ::123.123.123.123/96 Scope:Compat
UP RUNNING NOARP MTU:1480 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
sit1 Link encap:IPv6-in-IPv4
inet6 addr: fe80::c2a7:e829/10 Scope:Link
UP POINTOPOINT RUNNING NOARP MTU:1480 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
#route -A inet6 add 3ffe::/16 gw fe80::194.57.138.60 dev sit1
#route --inet6
Destination Next
Hop Flags Metric Ref Use Iface
::1/128
:: U 0 0 0 lo
::127.0.0.1/128
:: U 0 0 0 lo
::123.123.123.123/128
:: U 0 0 0 lo
::/96
:: U 256 0 0 sit0
3ffe::/16
fe80::c239:8a3c UG 1 0 0 sit1
fe80::c2a7:e829/128
:: U 0 0 0 lo
fe80::2c0:4fff:fedd:8a5d/128
:: U 0 0 0 lo
fe80::/10
:: UA 256 0 0 eth0
fe80::/10
:: UA 256 0 0 sit1
ff00::/8
:: UA 256 0 0 eth0
ff00::/8
:: UA 256 0 0 sit1
::/0
:: UDA 256 0 0 eth0
What are these sit devices exactly?
Why are there two sit devices sit0 and sit1 ?
How can I see what goes to/from these devices ?
What really happens when I send an IPv6 packet with a destination
address which begins by 3ffe ?
How does this all works??
When I try to ping6 a remote host I have no response.
Here is a tcpdump:
# tcpdump -n -i eth0 ether host 00:C0:4F:DD:8A:5D
tcpdump: listening on eth0
18:54:49.446621 123.123.123.123 > 194.57.138.60: ip-proto-41 104 (DF)
18:54:50.446636 123.123.123.123 > 194.57.138.60: ip-proto-41 104 (DF)
....
Thanks for helping
Pierre
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