Occasionally, it's useful to know the hwaddr or MAC addr of an interface
without actually booting a box, such as when you are setting up a
jumpstart config for said box. On Sun Sparc based machines, this
information can be obtained within the OpenBoot (OB) environment.
As an aside, until recent years, all network interfaces on a Sun Sparcwithout actually booting a box, such as when you are setting up a
jumpstart config for said box. On Sun Sparc based machines, this
information can be obtained within the OpenBoot (OB) environment.
box had the same hwaddr, though this was configurable via setting the
'local-mac-address?' variable at obp to true or false:
{11} ok setenv local-mac-address? true
{11} ok printenv local-mac-address?
local-mac-address? = true
Newer Sun Sparc boxes tend to have 'local-mac-address?' preset to
true. Why is this of concern? If 'local-mac-address?' is set to false,
all interfaces will share the same hwaddr, whereas if set to true,
all interfaces hold a unique hwaddr.
The following has been culled from a Sun Fire T2000, though should
be similar on other Sparc server types. To get a listing of network
interfaces installed on the system and select one for information,
use 'show-nets'. Select the interface desired (in this case, 'a') and
'cd' there:
{11} ok show-nets
a) /pci@7c0/pci@0/pci@2/network@0,1
b) /pci@7c0/pci@0/pci@2/network@0
c) /pci@780/pci@0/pci@1/network@0,1
d) /pci@780/pci@0/pci@1/network@0
q) NO SELECTION
Enter Selection, q to quit: a
/pci@7c0/pci@0/pci@2/network@0,1 has been selected.
Type ^Y ( Control-Y ) to insert it in the command line.
e.g. ok nvalias mydev ^Y
for creating devalias mydev for /pci@7c0/pci@0/pci@2/network@0,1
{11} ok cd /pci@7c0/pci@0/pci@2/network@0,1
To get the interface hwaddr, use '.properties' and look for the entry
'mac-addresses', which should be close to the top:
{11} ok .properties
local-mac-address 00 14 4f 7e 17 f1
mac-addresses 00 14 4f 7e 17 f1
assigned-addresses 82070110 00000000 03020000 00000000 00020000
81070118 00000000 00001020 00000000 00000020
compatible pciex8086,105e.108e.105e.6
pciex8086,105e.108e.105e
pciex8086,105e.6
pciex8086,105e
pciexclass,020000
pciexclass,0200
reg 00070100 00000000 00000000 00000000 00000000
03070110 00000000 00000000 00000000 00020000
max-frame-size 00010000
address-bits 00000030
device_type network
name network
interrupts 00000002
cache-line-size 00000010
class-code 00020000
subsystem-id 0000105e
subsystem-vendor-id 0000108e
revision-id 00000006
device-id 0000105e
vendor-id 00008086
Below, the same process as above has been repeated on the same T2000
host, however, choosing a different interface, illustrating the separate,
unique hwaddr since 'local-mac-address?' is set to true:
{11} ok show-nets
a) /pci@7c0/pci@0/pci@2/network@0,1
b) /pci@7c0/pci@0/pci@2/network@0
c) /pci@780/pci@0/pci@1/network@0,1
d) /pci@780/pci@0/pci@1/network@0
q) NO SELECTION
Enter Selection, q to quit: d
/pci@780/pci@0/pci@1/network@0 has been selected.
Type ^Y ( Control-Y ) to insert it in the command line.
e.g. ok nvalias mydev ^Y
for creating devalias mydev for /pci@780/pci@0/pci@1/network@0
{11} ok cd /pci@780/pci@0/pci@1/network@0
{11} ok .properties
local-mac-address 00 14 4f 7e 17 ee
mac-addresses 00 14 4f 7e 17 ee
assigned-addresses 82040010 00000000 00200000 00000000 00020000
81040018 00000000 00000000 00000000 00000020
compatible pciex8086,105e.108e.105e.6
pciex8086,105e.108e.105e
pciex8086,105e.6
pciex8086,105e
pciexclass,020000
pciexclass,0200
reg 00040000 00000000 00000000 00000000 00000000
03040010 00000000 00000000 00000000 00020000
max-frame-size 00010000
address-bits 00000030
device_type network
name network
interrupts 00000001
cache-line-size 00000010
class-code 00020000
subsystem-id 0000105e
subsystem-vendor-id 0000108e
revision-id 00000006
device-id 0000105e
vendor-id 00008086
