Cloud firewall disables CentOS firewall? Or iptables not in kernel?

April 5, 2018 930 views
DigitalOcean Cloud Firewalls Firewall CentOS
jeb
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jeb

Some time (not sure how long) after I set up my Cloud Firewall, I discovered that the built-in iptables firewall in my CentOS droplet has stopped working. I have this message in diagnostics:

iptables v1.4.21: can’t initialize iptables table `filter’: Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

Is this typical? I upgraded the kernel about two weeks after the SPECTRE/etc. reports came out, not sure if that is part of the scenario either.

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1 Answer
ryanpq MOD April 9, 2018

The module certainly should be there and the cloud firewall should not have any effect on your ability to launch iptables on your droplet(s).

Doing a bit of searching, there are others who have encountered this issue on CentOS and by ensuring the module is properly loaded they have resolved this issue:

sudo modprobe ip_tables
sudo echo 'ip_tables' >> /etc/modules
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