04-14-2011
Sometimes the ports are wired together, so there is no difference. USB is, after all, 4 wires: gound, +5v, data out and data in. If they are different usb adapters, maybe this will help:
An Overview of Linux USB | Linux Journal
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LEARN ABOUT DEBIAN
if_udav
UDAV(4) BSD Kernel Interfaces Manual UDAV(4)
NAME
udav -- Davicom DM9601 USB Ethernet driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device ehci
device uhci
device ohci
device usb
device miibus
device udav
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_udav_load="YES"
HARDWARE
The udav driver supports the following adapters:
o Corega FEther USB-TXC
o ShanTou ST268 USB NIC
DESCRIPTION
The udav driver provides support for USB Ethernet adapters based on the Davicom DM9601 chipset.
For more information on configuring this device, see ifconfig(8).
SEE ALSO
altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), usb(4), ifconfig(8)
Davicom DM9601 data sheet, http://www.davicom.com.tw/big5/download/Data%20Sheet/DM9601-DS-P01-930914.pdf.
HISTORY
The udav device driver first appeared in NetBSD 2.0.
AUTHORS
The udav driver was written by Shingo WATANABE <nabe@nabechan.org>.
BSD
July 16, 2005 BSD