Chandler Swift
3c8150a5aa
When `ip=dhcp` is passed as a kernel param (which I assume, but don't
know for sure, just gets passed to systemd and probably then to
systemd-networkd or NetworkManager or whatever does the networking in
the initrd?), IPv6 doesn't come up. With the param, bad IPv6:
```text
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 3c:52:82:00:46:d6 brd ff:ff:ff:ff:ff:ff
altname enp0s31f6
inet 192.168.1.20/24 brd 192.168.1.255 scope global eno1
valid_lft forever preferred_lft forever
inet6 2601:441:8301:8af7:94e1:4d4c:73c2:ac31/64 scope global temporary dynamic
valid_lft 322763sec preferred_lft 86330sec
inet6 fd0a:8f9f:6f83:0:3e52:82ff:fe00:46d6/64 scope global dynamic mngtmpaddr proto kernel_ra
valid_lft forever preferred_lft forever
inet6 2601:441:8301:8af7:3e52:82ff:fe00:46d6/64 scope global dynamic mngtmpaddr proto kernel_ra
valid_lft 322763sec preferred_lft 322763sec
inet6 fe80::3e52:82ff:fe00:46d6/64 scope link proto kernel_ll
valid_lft forever preferred_lft forever
```
whereas without the param I get good (whatever that means) addresses:
```text
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 3c:52:82:00:46:d6 brd ff:ff:ff:ff:ff:ff
altname enp0s31f6
inet 192.168.1.20/24 brd 192.168.1.255 scope global dynamic noprefixroute eno1
valid_lft 43188sec preferred_lft 43188sec
inet6 fd0a:8f9f:6f83::33b/128 scope global dynamic noprefixroute
valid_lft 43190sec preferred_lft 43190sec
inet6 2601:441:8301:8af7::33b/128 scope global dynamic noprefixroute
valid_lft 43190sec preferred_lft 43190sec
inet6 2601:441:8301:8af7:b572:fc6c:ba27:dcdb/64 scope global temporary dynamic
valid_lft 322965sec preferred_lft 86235sec
inet6 2601:441:8301:8af7:f3f0:df23:a6bb:7d25/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 322965sec preferred_lft 322965sec
inet6 fd0a:8f9f:6f83:0:485e:f55d:fa1d:cef4/64 scope global temporary dynamic
valid_lft 604790sec preferred_lft 86235sec
inet6 fd0a:8f9f:6f83:0:7851:1417:807:f017/64 scope global mngtmpaddr noprefixroute
valid_lft forever preferred_lft forever
inet6 fe80::eb0c:1983:24a5:3e42/64 scope link noprefixroute
valid_lft forever preferred_lft forever
```
I'm honestly not entirely sure what this _should_ look like, but what I
_do_ know is that in the "bad" configuration, SSH takes an extra ~10s to
connect as it has to wait for two ~5s `No route to host` timeouts:
```console
[chandler@oscar:~]$ ssh -v root@bert
OpenSSH_9.8p1, OpenSSL 3.0.14 4 Jun 2024
debug1: Reading configuration data /home/chandler/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 5: Applying options for *
debug1: Connecting to bert [fd0a:8f9f:6f83::33b] port 22.
debug1: connect to address fd0a:8f9f:6f83::33b port 22: No route to host
debug1: Connecting to bert [2601:441:8301:8af7::33b] port 22.
debug1: connect to address 2601:441:8301:8af7::33b port 22: No route to host
debug1: Connecting to bert [192.168.1.20] port 22.
debug1: Connection established.
```
Future work: What _should_ my IPv6 config look like? Is there any way I
can keep network config stable between the initrd and the booted system?
Why is this recommended against?
> The default is false when systemd is enabled in initrd, because the
> systemd-networkd documentation suggests it.
68 lines
2.1 KiB
Nix
68 lines
2.1 KiB
Nix
{ config, pkgs, lib, ... }:
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{
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imports =
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[
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./hardware-configuration.nix
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./services/factorio.nix
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./services/http/index.nix
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./services/monitoring.nix
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];
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# Bootloader
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boot.loader.systemd-boot.enable = true;
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boot.loader.efi.canTouchEfiVariables = true;
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# Set up SSH unlocking
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boot.kernelParams = [ "ip=dhcp" ];
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boot.initrd = {
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availableKernelModules = [ "e1000e" ];
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network = {
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enable = true;
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flushBeforeStage2 = true; # Without this, stage2 IPv6 config is messed up?
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ssh = {
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enable = true;
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port = 22;
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authorizedKeys = [ "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEhPyyqS3BGYor3zLbjc8hZuhem3mS8TNmvWogXcnz/b chandler@chandlerswift.com" ];
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hostKeys = [ "/etc/secrets/initrd/ssh_host_ed25519_key" ];
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shell = "/bin/cryptsetup-askpass";
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};
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};
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};
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boot.initrd.luks.devices."luks-48836129-1aa0-45c7-9fd1-6b053fa620b1".device = "/dev/disk/by-uuid/48836129-1aa0-45c7-9fd1-6b053fa620b1";
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networking.hostName = "bert";
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# Enable networking
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networking.networkmanager.enable = true;
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time.timeZone = "America/Chicago";
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i18n.defaultLocale = "en_US.UTF-8";
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services.xserver.xkb = {
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layout = "us";
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variant = "";
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};
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environment.systemPackages = with pkgs; [
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rsync
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];
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# Enable the OpenSSH daemon.
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services.openssh.enable = true;
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users.users.root.openssh.authorizedKeys.keys = [''ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEhPyyqS3BGYor3zLbjc8hZuhem3mS8TNmvWogXcnz/b chandler@chandlerswift.com'' ];
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networking.firewall.allowedTCPPorts = [
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80 # Caddy
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443 # Caddy
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];
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# This value determines the NixOS release from which the default
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# settings for stateful data, like file locations and database versions
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# on your system were taken. It‘s perfectly fine and recommended to leave
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# this value at the release version of the first install of this system.
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# Before changing this value read the documentation for this option
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# (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
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system.stateVersion = "24.05"; # Did you read the comment?
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}
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