Newbie help/Tunnel problem

[Rick <hui@student.dlut.edu.cn>]

 I want to set a tunnel to connect with others.
My site:  IPv4  210.30.17.57
	   IPv6  3ffe:321e:1:181::2
Remote site:   IPv4 202.38.99.1
	   IPv6 3ffe:321e:1:181::1

And my /etc/network/interfaces files
---------------------------------------
    iface lo inet loopback

    iface eth0 inet static
      address 210.30.17.57
      netmask 255.255.255.0
      gateway 210.30.17.254

    iface eth0 inet6 static
      address 3ffe:321e:1:181::2
      netmask 64
      gateway 3ffe:321e:1:181::1
------------------------------------
then I running
    #ifconfig sit0 up
    #ifconfig sit0 tunnel ::202.38.99.1
    #ifconfig sit1 up
    #ifconfig sit1 add 3ffe:321e:1:181::2/64

And the following is the result of ifconfig
    eth0      Link encap:Ethernet  HWaddr 00:80:C8:4B:8A:B5
          inet addr:210.30.17.57  Bcast:210.30.17.255  Mask:255.255.255.0
          inet6 addr: fe80::280:c8ff:fe4b:8ab5/10 Scope:Link
          inet6 addr: 3ffe:321e:1:181::2/64 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3064 errors:1 dropped:0 overruns:0 frame:0
          TX packets:1058 errors:3 dropped:0 overruns:0 carrier:3
          collisions:0 txqueuelen:100
          Interrupt:10 Base address:0x7000

  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:16436  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 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: ::210.30.17.57/96 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: 3ffe:321e:1:181::2/64 Scope:Global
          inet6 addr: fe80::d21e:1139/10 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
 And the result of ping6
 # ping6 3ffe:321e:1:181::1
PING 3ffe:321e:1:181::1(3ffe:321e:1:181::1) 56 data bytes
>From ::1: Destination unreachable: Address unreachable
>From ::1: Destination unreachable: Address unreachable
>From ::1: Destination unreachable: Address unreachable
?--- 3ffe:321e:1:181::1 ping6 statistics ---
5 packets transmitted, 0 packets received, 100% packet loss


   The adminstrator of remote server hardly make mistake. So could someone tell me
   why my tunnel could not work.
   And why the inet6 address in sit0 is ::210.30.17.57/96,
  not ::202.38.99.1/96.

   BTW:another question,when I running
   #ip tunnel add mytunl mode sit remote 202.38.99.1
   #ip link set mytunl up
   I got erroe:
   SIOCGIFFLAGS: No such device
   What is the problem?


            Rick
            hui@student.dlut.edu.cn