Please note that the various rules files are there for admins to adjust as needed. However, to work with other programs on the system, I reiterate that by default ufw will not flush anything it doesn't manage itself (MANAGE_BUILTINS, as mentioned, controls this behavior). If someone adds rules to these files then care is needed to add rules to remove them. You could add flush rules to do this like has been posted above, but as posted this is not much different from setting MANAGE_BUILTINS=yes. Perhaps you would like to instead add to the nat table your own chain, adding your rules to the chain, and then flush that chain (this is what ufw does internally for its chains).
Maciej mentioned after_up, after_down, before_up and before_down. Please note that these days ufw supports something similar with its /etc/ufw/after.init and /etc/ufw/before.init scripts. See 'BOOT INITIALIZATION' in 'man ufw-framework' for details. Progress has been made on nat and other routing rules, so ufw will start to manage some of these others tables in a similar fashion as the filter table (thought it's been slow going). -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ufw in Ubuntu. https://bugs.launchpad.net/bugs/881137 Title: UFW does not clean iptables setting from /etc/ufw/before.rules Status in ufw package in Ubuntu: Won't Fix Bug description: Adding some additional settings to /etc/ufw/before.rules is not deleted when ufw is stopped. I added these lines at top of file /etc/ufw/before.rules *nat :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE COMMIT Then I reloaded ufw firewall with command: ufw reload. Output from iptables-save $ iptables-save -t nat *nat :PREROUTING ACCEPT [4:478] :INPUT ACCEPT [4:478] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE COMMIT Then I reloaded ufw firewall again: $ iptables-save -t nat *nat :PREROUTING ACCEPT [4:478] :INPUT ACCEPT [4:478] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE -A POSTROUTING -o eth0 -j MASQUERADE COMMIT And ufw reload again $ iptables-save -t nat *nat :PREROUTING ACCEPT [4:478] :INPUT ACCEPT [4:478] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE -A POSTROUTING -o eth0 -j MASQUERADE -A POSTROUTING -o eth0 -j MASQUERADE COMMIT And again and postrouting is never deleted when ufw is stopped and added again when stared. Same happen if I stop ufw firewall with: $ stop ufw. nat lines are not cleaned. UFW should remove all iptables settings specified in config files after ufw is stopped! This can be dangerous if apt-get is updating some ufw files and scripts needs to reload ufw (some lines will be more times). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ufw/+bug/881137/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
