De har alle den samme MAC addresse 00:e0:4c:53:44:58
Derudover er det den billigste ethernet/usb/hub på Ebay $3.25, og sikkert også den dårligste.
$ lsusb -d 0fe6:9700 -v
Bus 001 Device 004: ID 0fe6:9700 Kontron (Industrial Computer Source / ICS Advent) DM9601 Fast Ethernet Adapter
Couldn't open device, some information will be missing
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0fe6 Kontron (Industrial Computer Source / ICS Advent)
idProduct 0x9700 DM9601 Fast Ethernet Adapter
bcdDevice 1.01
iManufacturer 0
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 120mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 0 (Defined at Interface level)
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
Der er tale om en USB1.1 enhed, som man brugte i det forrige årtusinde. USB1.1 har en maximal hastighed på 12 MBit/sec, som man ser i klumber af maximalt 64 bytes. Men til mange ting er det jo nok. Så vi skal blot have fixet problemet med MAC-addressen. Det kan klares med en lille udev-rule
$ cat /etc/udev/rules.d/99-dm9601.rules
# set MAC to hostbased MAC as on Raspberry pi 3
ACTION=="add|move", SUBSYSTEM=="net", SUBSYSTEMS=="usb", ATTR{address}=="00:e0:4c:53:44:58", IMPORT{program}="/usr/local/sbin/fix_mac_00e04c534458.sh", ENV{NM_UNMANAGED}="1"
Der kalder et script
$ cat /usr/local/sbin/fix_mac_00e04c534458.sh
#!/bin/bash
# raspberry pi 3 has MAC b8:27:eb:..:..:.. the last 3 bytes is the last 3 bytes of serial no.
SERIAL=($(sed -n '/^Serial/{s/.* //;p}' /proc/cpuinfo | fold -w2))
if [ ${#SERIAL[@]} != 8 ]; then
# echo this is not a Raspberry Pi, use 8 lower bytes from machine-id
SERIAL=($(fold -w2 /etc/machine-id | tail -8))
fi
NEW_MAC=b8:27:eb:${SERIAL[5]}:${SERIAL[6]}:${SERIAL[7]}
if [ x$INTERFACE != x ]; then
/bin/ip link set dev $INTERFACE address $NEW_MAC
fi
echo "ATTR{address}==\"$NEW_MAC\""
Jeg vil dog anbefale at man undgår disse usb/ethernet/hub og i stedet får fat i in 4 ports USB-hub (ebay $1) og en USB-WiFi (ebay $1.75) så har man en meget hurtigere løsning der bruger meget mindre strøm, og så er det billigere.
Men jeg er allerede blevet snydt.
