After running iptables -F my server goes offline???

abefroman · 01-03-2011, 09:52 PM

After running iptables -F my server goes offline???

Isn't that suppose to flush the iptables, so it will allow all traffic?

kaushalpatel1982 · 01-03-2011, 10:43 PM

Do you run this command from SSH Client or from the server only ?
do you able to ping after flushing IPTables?

abefroman · 01-03-2011, 10:43 PM

Quote:

Originally Posted by kaushalpatel1982

Do you run this command from SSH Client or from the server only ?
do you able to ping after flushing IPTables?

From an SSH client, I could not ping it afterwards.

anomie · 01-04-2011, 12:24 AM

Quote:

Originally Posted by abefroman

After running iptables -F my server goes offline???

Isn't that suppose to flush the iptables, so it will allow all traffic?

Not if you've set the INPUT chain POLICY to DROP.

The iptables(8) -F option flushes only rules, not policies.

alpha01 · 01-04-2011, 12:28 AM

Quote:

Originally Posted by anomie

Not if you've set the INPUT chain POLICY to DROP.

The iptables(8) -F option flushes only rules, not policies.

Your'e a genius anomie, I've experienced this exact issue before and couldn't figure out why I got locked out after running iptables -F

anomie · 01-04-2011, 12:30 AM

I'm certainly not that.

But I have done enough stupid things (and locked myself out of enough servers) to have learnt me lesson.

okcomputer44 · 01-04-2011, 02:12 AM

Quote:

Originally Posted by abefroman

After running iptables -F my server goes offline???

Isn't that suppose to flush the iptables, so it will allow all traffic?

Code:

service iptables stop

will do the trick.

The -F deletes all rules in the chain or all chains.
Worst scenario if you are logged in via ssh client.

abefroman · 01-04-2011, 05:14 AM

Quote:

Originally Posted by anomie

Not if you've set the INPUT chain POLICY to DROP.

The iptables(8) -F option flushes only rules, not policies.

Thanks!