[6bone] Build a tunnel with modem/router that filter IP protocol 41

[Nicolas DEFFAYET]

Hello,

A lot of stupid modem/router filter all traffic that aren't ICMP, TCP,
UDP or GRE.

I will take for example the Eicon ADSL modem because i know 2 peoples
who have this modem and try to have a IPv6 over IPv4 tunnel with it.

This modem work like this:

ISP <-ADSL-> MODEM <-LAN-> COMPUTER
Public IPv4 address is on the modem and all ports are forwarded and NAT
enabled to the computer.

You can read on the eicon website
(http://www.eicon.com/support/helpweb/adsl/vpn.asp):
"The NAT Router built-in to the 24xx series allows only TCP, UDP, GRE,
and ICMP protocols through. Any other protocols are silently dropped for
security reasons."

I did many tests with this 2 peoples and this modem filter the IP
protocol 41 and the IPv6 over IPv4 tunnel don't work.

I wait a reply of Eicon for this.

=> What's the possibility for build a IPv6 over IPv4 with this
modem/router ?

I wait your comments about that.

Best Regards,

Nicolas DEFFAYET