Hi,
short intro:
------------ we have got a Cisco 836. Unfortunately, we cant use the ADSL feature, because our ISP 'only' provides ADSL2+ and the C836 is not capable of ADSL2+. Nevertheless, with IOS 12.4 there comes an Ethernet 2 interface which can be used for PPPoE with dynamic IPv4 address. This works perfectly ;-)
challenge:
---------- Our current challenge is to establish our IPv6 6in4 tunnel to SixXS.net via aiccu which should be located on an openwrt router one hop 'behind' the Cisco router.
cf.
cf. footnote 1: "Unless the machine performing the NAT function is configured to forward protocol 41 to the actual endpoint or when the NAT supports proto-41 because it keeps state for outbound proto-41 packets and relies on that information."
The 6in4-heartbeat tunnel uses IP protocol-41 and therefore has a very short tunnel overhead. (compared to AYIYA)
question:
--------- how to direct the proto-41 traffic to my openwrt router via NAT?
I have read many docs on cisco.com but didn't find any hint for "NATing" a specific protocol only.
Any help, comments etc is highly appreciated,
Thanks in advance,
Valentin
keywords: Cisco, IOS, IPv6, OpenWRT, aiccu, sixXS.net, proto-41, AYIYA