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Login a root. Start "ncu" utility:

# ncu

CHARON Network Configuration Utility, STROMASYS (c) 2015 Version 1.5 

Interfaces Dedicated to State
---------- ------------ ------------
eth0       host         connected to host
eth1       host         connected to host
lo         host         unmanaged from host

==================================================================
bridge name     bridge id        STP enabled            interfaces

select action:
1 - Dedicate to CHARON
2 - Release to host
3 - Create Bridge with TAPs
4 - Destroy Bridge
5 - Print status
6 - Exit
:> 3

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  1. Login as "root" user.

  2. Configure the physical network interface to run in promiscuous mode using the following command. This interface will be dedicated to the whole network bridge (created later).

    # ifconfig eth<N> 0.0.0.0 promisc up

    Promiscuous mode allows the physical (or virtual) network interface to accept the entire volume of incoming packets. This mode is essential for consistency of the information transfer.

  3. In case the firewall is enabled on the host system, the following command should be executed to allow the bridge to forward IP packets:

    # /sbin/iptable -I FORWARD -m physdev --physdev-is-bridged -j ACCEPT

    This command can also be performed from the bridge configuration script. It has to be executed each time the iptables service is (re)started.

    It is also possible to make this setting system-wide. Either:

    1. Issue the given command from the firewall control panel.

    2. Add the following line to the end of the "/etc/sysconfig/iptables" file:

      -I FORWARD -m physdev --physdev-is-bridged -j ACCEPT

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