hi... I instaled debian sarge's base system with 5 interface that connects to 5 port on switch cisco 2950T that configured sprate VLAN. I use Iptables for inter vlan routing and firewalling, but i have problem and my frames have CheckSum error On tcp Header. why???????? required any patches??? Thanks Alot for attentions my switch config example) interface gig 0/1: switchport mode trunk ***** interface fast 0/10 switchport mode access switchport access vlan 3 ------------------------- rahimi{at}eaedu.net rahimi_m{at}cse.shirazu.ac.ir -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]