i have had ipv6 running fine here for about 4 weeks until yesterday when it decided to stop working (and no i didnt change anything) i'm running this on fedora core release 2 (linux) in a nutshell, i can ping my tunnel (ipv4) but i cannot ping6 my ping6 tunnel my ipv6 details are here (from my sixxs.sh script) CODE #!/bin/sh ### CONFIGURATION: SIXXS ##################### # Inteface to bind the tunnel to IF="sit1" # IPv4 address of the tunnelbroker ISP4="213.204.193.2" # IPv6 address of the tunnelbroker ISP6="2001:960:2:29a::1" # Local IPv4 address to bind the tunnel to LOC4="81.225.169.198" # Local IPv6 address LOC6="2001:960:2:29a::2/64" # Local IPv6 subnet LSN="2001:960:6eb" # Time to live TTL="64" # Maximum transfer unit # Maximum transfer unit MTU="1280" ############################################## ######################################### ### DO NOT EDIT ANYTHING BELOW UNLESS ### #### YOU KNOW WHAT YOU ARE DOING!! #### ######################################### # System variables FILENAME=`basename $0` IP=`which ip` IFCONFIG=`which ifconfig` ROUTE=`which route` # Start the IPv6 engine start() { $IFCONFIG sit0 up $IFCONFIG sit0 tunnel ::$ISP4 $IFCONFIG $IF up $IFCONFIG $IF add $LOC6 $ROUTE -A inet6 add 2000::/3 gw $ISP6 dev $IF $IP link set mtu $MTU dev sit0 $IP link set mtu $MTU dev $IF $IP tunnel change $IF ttl $TTL # Add additional addresses here $IP -6 addr add $LSN::1/128 dev $IF #$IP -6 addr add $LSN::1:1/128 dev $IF } # Stop the IPv6 engine stop() { $IP -6 route flush dev $IF $IP link set dev $IF down $IP tunnel del $IF $IFCONFIG sit0 down } restart() { stop start } case "$1" in start) start echo -e "Enabling IPv6: [ \033[40;32m OK \033[0m ]" ;; stop) stop echo -e "Disabling IPv6: [ \033[40;32m OK \033[0m ]" ;; restart) restart ;; *) echo -e "\033[40;32m$FILENAME\033[0m {\033[40;32mstart\033[0m|\033[40;32mrestart\033[0m|\033[40;32mstop\033[0m}" ;; esac when i as root, type sixxs.sh start it starts fine, no error messages [root@localhost root]# sixxs.sh start SIOCSIFADDR: File exists SIOCADDRT: File exists RTNETLINK answers: File exists Enabling IPv6: [ OK ] yet if i try to ping the ipv4 of my tunnel broker it works, but if i try to ping6 my tunnel broker, it fails. i have correctly used IPTABLES on the router (in my case smoothwall) to route protocol 41 and this has worked fine for some time, just stopped yesterday and wont come back any advice from anyone ?? [root@smoothwall root]# iptables -t nat -I PREROUTING -p 41 -j DNAT --to-destination 192.168.0.117 [root@smoothwall root]# iptables -I FORWARD -p 41 -j ACCEPT original post here - http://www.linux-noob.com/forums/index.php?showtopic=926&hl= cheers anyweb