01-16-2012 12:52 PM - edited 03-01-2019 05:32 PM
Hi everybody
My book says ISTAP tunnels do not use special reserved range of ipv6 (2002::/16).
But when i configure istap tunnel using 2002::/16; I did not get any error message.
Below is the config;
R1
interface Tunnel1
no ip address
no ip redirects
ipv6 address 2002::/64 eui-64
tunnel source Loopback1
tunnel mode ipv6ip isatap
R1# show ipv6 int tunnel 1
Tunnel1 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::5EFE:101:101
No Virtual link-local address(es):
Global unicast address(es):
2002::5EFE:101:101, subnet is 2002::/64 [EUI]
thanks and have a great day.
Solved! Go to Solution.
01-16-2012 11:15 PM
Hi Sarah,
ISATAP tunnels use addressing of this format:
Indeed, ISATAP tunnels do not use a special prefix but rather a specific format of the IPv6 addressing. Therefore, the router won't complain when using 2002::/16 prefixes, as they nicely fit into the 64-bit prefix. However, semantically, you are doing an incorrect thing if you are addressing ISATAP tunnels using 6to4 addressing because you are making the ISATAP tunnel appear as 6to4 tunnel to nodes using 6to4 tunneling.
Best regards,
Peter
01-16-2012 11:15 PM
Hi Sarah,
ISATAP tunnels use addressing of this format:
Indeed, ISATAP tunnels do not use a special prefix but rather a specific format of the IPv6 addressing. Therefore, the router won't complain when using 2002::/16 prefixes, as they nicely fit into the 64-bit prefix. However, semantically, you are doing an incorrect thing if you are addressing ISATAP tunnels using 6to4 addressing because you are making the ISATAP tunnel appear as 6to4 tunnel to nodes using 6to4 tunneling.
Best regards,
Peter
01-22-2012 10:10 AM
Hi Peter.
I hope you had a good weekend.
One more question occured to me while sleeping.
My book says the address on isatap tunnel can be configured by using eui-64 format and manually.
If we want to configure the address manuall, should this address contain 5efe as well?
Can i configure like this:
2000:0:1:1:0:1:0202:0202/64 ( where 2.2.2.2 is tunnel source address)?
or we must use 5efe?
thanks .
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