Ain't it similar to bond interface? I downloaded the latest OpenBSD and try to configure trunk interface, apparently it works and this is quick view of trunk interface. All the network interfaces that configured to be single trunk will receive traffic from all attached ports. Trunk allows aggregation of multiple network interfaces as one virtual inteface. How about OpenBSD? OpenBSD has introduced trunk interface in 3.8 release, and if you are always staying with Current or maybe you are always edging, you will notice they have even added failover capabilities for trunk interface, what is trunk interface anyway? You may find how to configure bond interface on RHEL/CentOS in InstantNSM documentation, or if your OS preference is FreeBSD, you may find the guide in taosecurity site. So if you are connecting your IDS sensor to the network tap, bonding interface is what you need since most of the expensive tap splits the stream into two, transmit and receive. Channel bonding enables two or more network interfaces to act as one, simultaneously increasing the bandwidth and providing redundancy. You may have heard about bonding interface in linux that allows you to bind multiple network interfaces together into a single channel.
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