02-18-2015
I stand corrected. Didn't think about tunneling.
This User Gave Thanks to blackrageous For This Post:
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LEARN ABOUT NETBSD
etherip
ETHERIP(4) BSD Kernel Interfaces Manual ETHERIP(4)
NAME
etherip -- EtherIP tunneling device
SYNOPSIS
pseudo-device etherip
DESCRIPTION
The etherip interface is a tunneling pseudo device for Ethernet frames. It can tunnel Ethernet traffic over IPv4 and IPv6 using the EtherIP
protocol specified in RFC 3378.
The only difference between an etherip interface and a real Ethernet interface is that there is an IP tunnel instead of a wire. Therefore,
to use etherip the administrator must first create the interface and then configure protocol and addresses used for the outer header. This
can be done by using ifconfig(8) create and tunnel subcommands, or SIOCIFCREATE and SIOCSLIFPHYADDR ioctls.
Packet format
Ethernet frames are prepended with a EtherIP header as described by RFC 3378. The resulting EtherIP packets will be encapsulated in an outer
packet, which may be either an IPv4 or IPv6 packet, with IP protocol number 97.
Ethernet address
When a etherip device is created, it is assigned an Ethernet address of the form f2:0b:a5:xx:xx:xx. This address can later be changed
through a sysctl node.
The sysctl node is net.link.etherip.<iface>. Any string of six colon-separated hexadecimal numbers will be accepted. Reading that node will
provide a string representation of the current Ethernet address.
Security
The EtherIP header of incoming packets is not checked for validity. This is because there seems to be some confusion about how such a header
has to look like. For outgoing packets, the header is set up the same way as done in OpenBSD, FreeBSD, and Linux to be compatible with those
systems.
Converting from previous implementation
A tunnel configured for the previous (undocumented) implementation will work with just renaming the device from gif to etherip.
SEE ALSO
bridge(4), gif(4), inet(4), inet6(4), tap(4), ifconfig(8)
HISTORY
The etherip device first appeared in NetBSD 4.0, it is based on tap(4), gif(4), and the former gif-based EtherIP implementation ported from
OpenBSD.
BUGS
Probably many. There is lots of code duplication between etherip, tap(4), gif(4), and probably other tunnelling drivers which should be
cleaned up.
BSD
November 23, 2006 BSD