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Last night I was trying to undo some ip table changes I did and I ended up doing iptables -F, Is there anyway to get back to normal? I'm on an ubuntu server.

2 Answers 2

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After you flushed all rules, this is your new "normal"...

If you have installed iptables-persistent you might be able to restore the last saved state with iptables-restore /etc/iptables/rules.v4

Otherwise you have to "restore" the rules by typing them in again.

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  • What are the basic rules in order to allow me to be able to access my server again?
    – PGBRULES
    Feb 5 at 5:19
  • Set the default to "accept" with iptables --policy INPUT ACCEPT, then insert your rules and as LAST rule you should drop evrything else: iptables -A INPUT -j DROP
    – Virsacer
    Feb 5 at 9:06
  • @Virsacer I think if the policies or INPUT or OUTPUT were DROP, OP cut its own remote access, but forgot to mention it in the question but only in last comment: "be able to access my server again". So it's all about out of band remote access: remote console, remote reboot etc.
    – A.B
    Feb 5 at 12:16
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Once you delete IPtables rules, you cannot get them back.

Run these commands to delete all IPtables rules:

iptables -t raw -F
iptables -t mangle -F
iptables -t nat -F
iptables -t filter -F
iptables -t raw -X
iptables -t mangle -X
iptables -t nat -X
iptables -t filter -X

-t is the flag for the table, there are 4 tables in IPtables. -F flushes the specified table. -X deletes all chains except the defaults in a given table.

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