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The router in question is a Cisco 871, show version as follows:

Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(24)T8,
RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Sun 09-Sep-12 09:09 by prod_rel_team

If so, what would a sample configuration for this scenario look like? And would there be any particular problems in running it on a router which is already providing IPv6 to its "internal" network via a 6ot4 tunnel?

Cerebrate
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  • Don't bother with Teredo. It's a very unreliable technology that is likely to go away in the future in favour of native IPv6 connectivity or more stable transition technology like SixXS or Hurricane Electric tunnels. – Sander Steffann Jun 25 '13 at 08:08
  • @SanderSteffann Unfortunately, for now I don't have anything else to use (that I'm aware of) to connect back from a mobile device which can be behind arbitrary not-mine-to-control not-ICMPable-or-passing-protocol-41 NATs. I'd use an HE tunnel if I could. :( – Cerebrate Jun 25 '13 at 19:20

1 Answers1

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Simple answer: No.

Teredo is common on Windows PC as a work-around for the lack of a local ipv6 router.

ftp://ftp.rfc-editor.org/in-notes/rfc4380.txt details the protocol and operation.

Cisco has support for 6to4 auto-tunnels and 6rd, but alas no Teredo support.

More client info at http://en.wikipedia.org/wiki/Teredo_tunneling#Implementations

Terry Sweetser
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  • That applies as a relay, as well as as a client? The router has native IPv6 as well as IPv4 - I just want it to act as a relay for a remote Teredo client. – Cerebrate Jun 25 '13 at 19:23