Koreader problems with iptables or insmod

Hello,

I tried to run koreader in my Kindle DXG 3.2.1, this is the output:

[root@kindle root]# /mnt/us/koreader/koreader.sh
system: I koreader.sh:def:koreader: Setting up IPTables rules . . .
Setting up IPTables rules . . .
FATAL: Module ip_tables not found.
iptables v1.3.8: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.8: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
system: I koreader.sh:def:koreader: Mounting system fonts . . .
Mounting system fonts . . .
system: I koreader.sh:def:koreader: Stopping cvm . . .
Stopping cvm . . .
system: I koreader.sh:def:koreader: Starting KOReader . . .
Starting KOReader . . .
system: I koreader.sh:def:koreader: Unmounting system fonts . . .
Unmounting system fonts . . .
system: I koreader.sh:def:koreader: Resuming cvm . . .
Resuming cvm . . .
system: I koreader.sh:def:koreader: Restoring IPTables rules . . .
Restoring IPTables rules . . .
FATAL: Module ip_tables not found.
iptables v1.3.8: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.8: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

Do I need to install insmod or iptables (how do I proceed that)?