At the outset i thank you very much for your post. It helped me a lot. I tried your configuration & it is working perfectly.
From IPV4 (ISATAP Client)with IP address 192.168.1.2 iam able to ping remote IPV6 machine with ip address 2001:a:b:c::2.
But i am not able to telnet the IPV6 Machine from IPV4 (ISATAP Client). After adding the default route ::/0 200:3def:5efe:c0a8:0102 (ISATAP server Tunnel interface IP), i am able to telnet to the remote IPV6 machine.
I am surprised why is this behaviour of able ping and not telnet the remote IPV6 machine. But why i am able to telnet the same IPV6 Machine from IPV4 (ISATAP Client) after adding the ipv6 default route with gateway as tunnel ISATAP ipv6 address.
What level of code are you using on the ISATAP client? I just tried with 12.4(24)T and I can ping and telnet to the rest of the network. You shouldn't need to configure a default route on the router used as a client just as you do not need to configured a default route on a regular client as in IPv6 the default router is discovered dynamically via the RA messages.
You should see the following information on the ISATAP client:
ISATAP-client#sh ipv6 router
Router FE80::5EFE:C0A8:C02 on Tunnel0, last update 8 min
As you adviced i tried the same. I attached configuration of ISATAP server and Client configuration for your reference.
But the result is same. Until i configure the default route with gateway as ISATAP server Tunnel IP Address in the client, I am able to ping the remote IPV6 Machine and not TELNET the same machine. I am using IOS Version 12.4(25).
Can you please look into the configuration and help me
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