"What if I told you there is a way to configure the network on any Linux server that: works across all distributions doesn't require any software installed apart from the kernel and a boot loader (no systemd-networkd, ifupdown, NetworkManager, nothing) is backwards compatible all the way back to Linux 2.0, in 1996 It has literally 8 different caveats on top of that, but is still totally worth your time."
"The method is this: ip= on the Linux kernel command line: for servers with a single IPv4 or IPv6 address, no software required other than the kernel and a boot loader (since 2002 or older) So by "new" I mean "new to me". This option is really old. The nfsroot.txt where it is documented predates the git import of the Linux kernel: it's part of the 2005 git import of 2.6.12-rc2. That's already 20+ years old already."
Kernel ip= boot parameter enables network configuration at boot without relying on userland network daemons. The option can assign IPv4 or IPv6 addresses, gateway, netmask, interface name, and autoconfiguration mode. The mechanism predates many modern tools and remains available across distributions and very old kernels, with traces back to Linux 2.0 and documentation in nfsroot.txt. Autoconfiguration modes include off/none (static), on/any (use any protocol), and dhcp. The approach requires only the kernel and a boot loader, supports simple server setups, and has several caveats but can be a pragmatic, low-dependency method for network setup.
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