08-31-2009 05:15 AM - edited 03-04-2019 05:53 AM
Hi folks,
If someone could clarify my configuration here for an ISATAP tunnel on a 2811 Router, directly connected to a Windows XP machine (LAB Environment). I have sourced the tunnel to the FA0/0 of the Router and applied a route on the Window XP Client as follows.netsh interface ipv6 isatap set router 10.10.10.1. The ipv4 address 10.10.10.1 is pingable from the XP Client ,but I dont see any route for the IPV6 tunnel on the XP client& I cant IPV6 ping the Windows XP client, from the 2811 Router. IPV6 is installed on the client.
Thanks for any advise in advance.
08-31-2009 06:58 AM
Hello Liam,
the host portion of the IPv6 ISATAP address should be:
0000:5EFE + 32bits equivalent of IPv4 address of tunnel source interface.
see
http://www.ietf.org/rfc/rfc4214.txt
section 6.1 isatap interface identifiers
in your case it should be:
3FFE:80C0:22C:817F:0000:5EFE:0A0A:0A01
and link local should be:
FE80::0000:5EFE:0A0A:0A01
instead we see:
SH IPV6 INT BRief
FastEthernet0/0 [up/up]
unassigned
FastEthernet0/1 [administratively down/down]
unassigned
Tunnel1 [up/up]
FE80::21D:70FF:FEBE:C190
3FFE:80C0:22C:817F:21D:70FF:FEBE:C190
the host portion of this /64 and of link local is :
21D:70FF:FEBE:C190
that is not correct so there is no communication between the two.
this looks like to be an EUI taken from a MAC address instead
see
http://www.ietf.org/rfc/rfc3513.txt
appendix A.
However, config examples don't show additional commands to force/change the OUI selection for the tunnel interface:
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-tunnel.html#wp1055566
This may be an IOS issue and I would suggest you to try another IOS image on the router.
ISATAP is based on the presence of the ipv4 address in the less significant 32 bits missing this cause the issue.
Hope to help
Giuseppe
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