2008-09-30

Fix in the tunnel6 module. IPv4 packets (sent over IPv6 tunnel) that were less than 
40 bytes long, were dropped. That affected reverse UDP traffic to be dropped.

This issue was actually length based, not traffic type based. UDP packets just happens
to be shorted that TCP. (Larger UDP packets were coming thru).

To fix this issue, copy and install kmod-iptunnel6_2.6.25.16-brcm47xx-1_mipsel.ipk.
Then reboot your LinkSys to load proper version of the module or perform 
folowing steps:

On a Linux box:
scp kmod-iptunnel6_2.6.25.16-brcm47xx-1_mipsel.ipk 192.168.1.1:/tmp

On Linksys box:
ipkg install /tmp/kmod-iptunnel6_2.6.25.16-brcm47xx-1_mipsel.ipk
ip link set down $TUNNELNAME
ip tunnel del $TUNNELNAME
rmmod ip6_tunnel
rmmod tunnel6
insmod /lib/modules/2.6.25.16/tunnel6.ko
insmod /lib/modules/2.6.25.16/ip6_tunnel.ko
ip -6 tunnel add ipip6 mode ipip6 local abcd::100 remote abcd::1
ip link set up ipip6