This way, multiple zones can be defined even on a server with only one network interface!Ĭaution: To get this feature, Firewalld relies on NetworkManager (see reference). – if not, the packet is associated with the default zone. – if not, is the packet coming from a network interface already bound to a zone? (if yes, it is associated with this zone), – is the packet coming from a source already bound to a zone? (if yes, it is associated with this zone), The association is done according to the following pattern: Source ManagementĪ zone can be bound to a network interface (see above) and/or to a network addressing (called here a source).Īny network packet entering in the network stack is associated with a zone. Note: Only permanent zones can be created. To create a new zone (here test), type: # firewall-cmd -permanent -new-zone=test To get the permanent configuration of the public zone, type: # firewall-cmd -permanent -zone=public -list-all To know which zone is associated with the eth0 interface, type: # firewall-cmd -get-zone-of-interface=eth0 Note3: The RHEL 7.3 release improves the way Firewalld handles zones (v0.3.9 -> v0.4.3.2: BZ# 1302802). Note2: More information about the nmcli command is available at the page dedicated to nmcli or at the IPV4 configuration page. It seems that with RHEL 7.5, the use of ZONE in ifcfg-* files no longer works ( source). Note1: This operation can also be done by editing the /etc/sysconfig/network-scripts/ifcfg-eth0 file and add ZONE=internal followed by # nmcli con reload.
#Add rule firewall builder mod#
# nmcli con mod "System eth0" connection.zone internalĬonnection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1) To permanently assign the eth0 network interface to the internal zone (a file called internal.xml is created in the /etc/firewalld/zones directory), type: # firewall-cmd -permanent -zone=internal -change-interface=eth0 Network interfaces can be assigned to a zone in a permanent way. Note: This information is stored in the /etc/firewalld/nf file. To change the default zone to home permanently, type: # firewall-cmd -set-default-zone=home To get the list of all the available zones, type: # firewall-cmd -get-zonesīlock dmz drop external home internal public trusted work Note: You can have more than one active zone at a time. To get the list of zones where you’ve got network interfaces or sources assigned to, type: # firewall-cmd -get-active-zones To get the default zone, type: # firewall-cmd -get-default-zone If you’ve got more than one network interface or use sources (see Source management section below), you will be able to restrict traffic between zones. Note: Without any configuration, everything is done by default in the public zone. In the latter case, this allows to restrict traffic based on origin zone (read this article from lwn.net for more details). Zone ManagementĪlso, a new concept of zone appears: all network interfaces can be located in the same default zone or divided into different ones according to the levels of trust defined. You can also look at the iptables rules created by Firewalld with the iptables-save command. Note: If you interested in kernel parameter configuration, there is a tutorial about the sysctl command.Īlthough Firewalld is the RHEL 7 way to deal with firewalls and provides many improvements, iptables can still be used (but both shouldn’t run at the same time). Then, activate the configuration: # sysctl -p To do that, paste the following line into the /etc/nf file: _forward=1 If you’ve got several network interfaces in IPv4, you will have to activate ip forwarding. Note: If Firewalld is not running, the command displays not running. Loaded: loaded (/usr/lib/systemd/system/rvice enabled)Īctive: active (running) since Tue 11:14:49 CEST 5 days ago To know if Firewalld is running, type: # systemctl status firewalldįrvice - firewalld - dynamic firewall daemon It mainly improves the security rules management by allowing configuration changes without stopping the current connections. It replaces the iptables interface and connects to the netfilter kernel code. Presentationįirewalld is the new userland interface in RHEL 7. Note: This is an RHCSA 7 exam objective and an RHCE 7 exam objective.
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