mirror of
https://git.savannah.gnu.org/git/gnuboot.git
synced 2025-01-06 16:27:40 +01:00
Denis 'GNUtoo' Carikli
6e5e4f3421
Before being merged with the commitdc6e1f32c1("Import website-build to build the GNU Boot website."), website-build was a separate git repository. And so, even after the merge, until the commit20d122e94a("website-build: use website from local git repository."), it still worked in the same way and still downloaded the website from git. This prevented merging the website and website-build directories together as the GNU Boot repository also needed to be a valid Untitled website repository as well. Now after this commit, the website is built from the same git tree, so we can simply adjust the build scripts to be able to move things around. In addition of making things more clear for contributors, it also simplify the migration to haunt as with haunt we typically have the haunt.cfg (and the autotools build code if needed) code in the top directory and the markdown files in a subdirectory. Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org> Acked-by: Adrien 'neox' Bourmault <neox@gnu.org>
99 lines
3.2 KiB
Markdown
99 lines
3.2 KiB
Markdown
---
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title: Changing the MAC address
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x-unreviewed: true
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...
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Introduction (GM45+e1000)
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=========================
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This section is applicable to all Libreboot-supported laptops with the
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mobile 4 series chipset (as shown in `$ lspci`)
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that use the e1000 ethernet controller (e.g. T400, X200).
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The R500 is an exception to this as it does not use the built-in e1000.
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On all these laptops, the
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[MAC address](https://en.wikipedia.org/wiki/MAC_address)
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for the built-in gigabit ethernet controller is stored inside the flash chip,
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along with Libreboot and other configuration data. Therefore, installing
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Libreboot will overwrite it.
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Thus, for these laptops, prebuilt Libreboot already contains a generic
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MAC address in the configuration section. This address is `00:f5:f0:40:71:fe
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in builds before 2018-01-16 and `00:4c:69:62:72:65` (see the ascii character
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set) afterwards.
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Unless you change it, your computer will boot and use it. This can lead
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to network problems if you have more than one Libreboot computer on
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the same layer2 network (e.g. on the same network switch). The switch
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(postman) will simply not know who to deliver to as the MAC (house) addresses
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will be the same.
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To prevent these address clashes, you can either modify prebuilt Libreboot
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to use an address of your own choosing or you can change the address in your
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operating system's boot scripts.
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In either case, it is a good idea to write down the address that your
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computer originally had.
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Obtaining the existing MAC address
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==================================
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The existing MAC address may be obtained by the following methods:
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1. Run `ip link` or `ifconfig` in a terminal/console/shell;
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find your ethernet device (e.g., **enpXXX** or **ethXXX**),
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and look for a set of 12 colon-delimited
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[hexadecimal digits](https://en.wikipedia.org/wiki/Hexadecimal).
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For example: `00:f3:f0:45:91:fe`.
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* `$ ip link
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... link/ether ??:??:??:??:??:?? brd ...
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* Alternatively:
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ifconfig
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... ether ??:??:??:??:??:?? txqueuelen ...
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2. Otherwise you can read the white label that is often found on the
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motherboard under the memory sticks:
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3. The MAC address is usually listed on the laptop chassis as well. This one
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will be incorrect if the motherboard was changed and the stickers were not
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updated.
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Changing the MAC address in the operating system
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================================================
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There are three portable ways of doing so:
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1. Using the new iproute2 package:
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ip link set <interface> down
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ip link set dev <interface> address 00:4c:69:62:72:65
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ip link set <interface> up
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2. Using the old `ifconfig` command:
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ifconfig <interface> hw ether 00:4c:69:62:72:65
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3. Using the macchanger package.
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You can use use of these three methods in your operating system's
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init scripts or you can use your operating system's own networking
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configuration. Refer to your operating system's documentation for
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how to do this.
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Changing the MAC address on X200/T400/T500/W500
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===============================================
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On GM45 laptops with ICH9M southbridge and Intel PHY module, the MAC address
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is hardcoded in boot flash, which means it can be changed if you re-flash.
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See [ich9utils documentation](../install/ich9utils.md)
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