VLAN

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

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