How can I disable the logging of iptables to the console?

To permanently disable all low level kernel messages (iptables etc) from flooding the console do the following changes (as root):

Edit the file /etc/sysctl.conf Add the following line:
kernel.printk = 4 1 1 7
The above changes will be effective at reboot or immediately using the following command:
# /sbin/sysctl -p /etc/sysctl.conf
To make the changes only temporarily:
# echo "4 1 1 7" > /proc/sys/kernel/printk
You can check the current setting with:
# cat /proc/sys/kernel/printk
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