Hello, How do I find out what is happening to my packets thru my ipsec tunnel. They just seem to disappear on the remote side. I have successfully got the pings thru when everything has an ipv6 address, but am not successful when trying to connect two ipv4 lans across an ipv6 ipsec tunnel. All fw chains both 4 and 6 are set to ACCEPT. NAT is turned off. eth0 eth1 eth1 eth0 10.1.254.254/17 2001:xxxx:1628::254 <----ipv6 internet -----> 2001:xxxx:e334::254 10.0.254.254/17 12:00:02.296972 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28b), length 132 12:00:03.308751 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28c), length 132 12:00:04.296857 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28d), length 132 12:00:05.293748 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28e), length 132 12:00:06.296623 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28f), length 132 I have posted to the ipsec-devel list and haven't gotten any responses. Also I have spent 2 days googling with no results about the above setup. Is it even possible to tunnel ipv4 packet thru an ipv6 ipsec tunnel? Thanks, Steve -- "They that give up essential liberty to obtain temporary safety, deserve neither liberty nor safety." (Ben Franklin) "The course of history shows that as a government grows, liberty decreases." (Thomas Jefferson)