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EPAIR(4) BSD Kernel Interfaces Manual EPAIR(4) NAME epair -- A pair of virtual back-to-back connected Ethernet interfaces. SYNOPSIS To compile this driver into the kernel, place the following line in your kernel configuration file: device epair Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_epair_load="YES" DESCRIPTION The epair is a pair of Ethernet-like software interfaces, which are con- nected back-to-back with a virtual cross-over cable. Each epair interface pair is created at runtime using interface cloning. This is most easily done with the ifconfig(8) create command or using the cloned_interfaces variable in rc.conf(5). While for cloning you only give either epair or epair_n_ the epair pair will be named like epair_n_[ab]. This means the names of the first epair interfaces will be epair0a and epair0b. Like any other Ethernet interface, an epair needs to have a network ad- dress. Each epair will be assigned a locally administered address by de- fault, that is only guaranteed to be unique within one network stack. To change the default addresses one may use the SIOCSIFADDR ioctl(2) or if- config(8) utility. The basic intend is to provide connectivity between two virtual network stack instances. When connected to a if_bridge(4) one end of the inter- face pair can also be part of another (virtual) LAN. As with any other Ethernet interface one can configure vlan(4) support on top of it. SEE ALSO ioctl(2), altq(4), bpf(4), if_bridge(4), vlan(4), loader.conf(5,) rc.conf(5), ifconfig(8) HISTORY The epair interface first appeared in FreeBSD 8.0. AUTHORS The epair interface was written by Bjoern A. Zeeb, CK Software GmbH, un- der sponsorship from the FreeBSD Foundation. BSD July 26, 2009 BSD
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | AUTHORS
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