1This module matches on the bridge port input and output devices enslaved 2to a bridge device. This module is a part of the infrastructure that enables 3a transparent bridging IP firewall and is only useful for kernel versions 4above version 2.5.44. 5.TP 6.BR --physdev-in " [!] \fIname\fP" 7Name of a bridge port via which a packet is received (only for 8packets entering the 9.BR INPUT , 10.B FORWARD 11and 12.B PREROUTING 13chains). If the interface name ends in a "+", then any 14interface which begins with this name will match. If the packet didn't arrive 15through a bridge device, this packet won't match this option, unless '!' is used. 16.TP 17.BR --physdev-out " [!] \fIname\fP" 18Name of a bridge port via which a packet is going to be sent (for packets 19entering the 20.BR FORWARD , 21.B OUTPUT 22and 23.B POSTROUTING 24chains). If the interface name ends in a "+", then any 25interface which begins with this name will match. Note that in the 26.BR nat " and " mangle 27.B OUTPUT 28chains one cannot match on the bridge output port, however one can in the 29.B "filter OUTPUT" 30chain. If the packet won't leave by a bridge device or it is yet unknown what 31the output device will be, then the packet won't match this option, unless 32'!' is used. 33.TP 34.RB "[!] " --physdev-is-in 35Matches if the packet has entered through a bridge interface. 36.TP 37.RB "[!] " --physdev-is-out 38Matches if the packet will leave through a bridge interface. 39.TP 40.RB "[!] " --physdev-is-bridged 41Matches if the packet is being bridged and therefore is not being routed. 42This is only useful in the FORWARD and POSTROUTING chains. 43