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Add IPv6 inside the PPP session and use enp2s0 in the example

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- wan.ipv6.transport = "ppp": IPv6CP in pppd, router advertisements and
  DHCPv6 prefix delegation on the PPP device, DHCPv6 accepted on the PPP
  device, IPv6 MSS clamped to MTU-60. Allowed on a shared single-NIC
  link. A build-time check requires a PPPoE uplink.
- IPv4 MSS clamping now only matches IPv4 packets.
- The example uses the new box's NIC name (enp2s0).

Covered by the onestick VM test (radvd and a minimal DHCPv6-PD
responder as the ISP) and assertion cases.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
nils
2026-10-28 15:03:57 +01:00
co-authored by Claude Sonnet 5.5
parent b5429ad876
commit 70dddad206
9 changed files with 227 additions and 22 deletions
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examples/desktop/default.nix
+5 -5
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@@ -1,14 +1,14 @@
# A single-NIC desktop PC as the router ("router on a stick").
#
# ISP -- ONT/modem -- switch/port --+-- eno1 (untagged) LAN 192.168.10.0/24
# +-- eno1.1001 PPPoE uplink (IPv4)
# ISP -- ONT/modem -- switch/port --+-- enp2s0 (untagged) LAN 192.168.10.0/24
# +-- enp2s0.1001 PPPoE uplink (IPv4)
#
# The switch port the PC is plugged into must carry VLAN 1001 tagged (towards
# the ISP) and the LAN untagged. IPv6 is off: without a second link there is no
# untagged uplink for DHCPv6 to run on.
#
# Before the first deployment:
# 1. Check the NIC name (`eno1`) with `ip link` on the target box. Disk layout and
# 1. Confirm the NIC name (`enp2s0`) with `ip link` on the target box. Disk layout and
# drivers come from the installer layout, so no hardware scan is needed.
# 2. Put your SSH public key below (otherwise nobody can log in over the network).
# 3. Put the PPPoE username below and the password in /var/lib/router/pppoe-password
@@ -34,7 +34,7 @@
enable = true;
wan = {
interface = "eno1";
interface = "enp2s0";
ipv4 = {
type = "pppoe";
pppoe = {
@@ -46,7 +46,7 @@
};
lans.main = {
interface = "eno1";
interface = "enp2s0";
internet = true;
ipv4.address = "192.168.10.1";
dhcp.pool = {