Hi all, details: linux fedora 3 (kernel compiled from official sources) iptables 1.2.11 (compiled from sources too) vlan support turned on (vconfig from cvs) I have following situation: eth0 eth1.X(vlans) internet----------[linux]-----------------[clients] I *DO NOT* use private addresses so I don't use NAT at all (just packet forwarding). One of my clients tries to establish IPsec connection to a host located somewhere outside of my network and it doesn't work. During the tests I removed all firewall rules. tcpdump shows me: [root@GW]# tcpdump -n -i eth1.9 -vv tcpdump: listening on eth1.9, link-type EN10MB (Ethernet), capture size 96 bytes 12:09:59.200139 IP (tos 0x0, ttl 116, id 7059, offset 0, flags [none], proto 50, length: 88) XX.XX.XX.XX > YY.YY.YY>YY: ESP(spi=0x139c2705,seq=0x35b) 12:10:01.767596 IP (tos 0x0, ttl 128, id 49969, offset 0, flags [none], proto 50, length: 88) YY.YY.YY.YY > XX.XX.XX>XX: ESP(spi=0x43b9ff86,seq=0x3d3) I tried to lower MTU on eth1.9 but it didn't help. Any ideas ? -- Best regards, Daniel mailto:daniel@xxxxxxxxx