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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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modules/router/assertions.nix
+10 -2
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@@ -416,8 +416,16 @@ in
{
assertion =
!(lib.elem cfg.wan.interface (map (l: l.interface) lans))
|| (cfg.wan.ipv4.type == "pppoe" && cfg.wan.ipv4.pppoe.vlan != null && !cfg.wan.ipv6.enable);
message = "router: the WAN interface `${cfg.wan.interface}` is also used by a LAN (only allowed for PPPoE on a VLAN with IPv6 disabled).";
|| (
cfg.wan.ipv4.type == "pppoe"
&& cfg.wan.ipv4.pppoe.vlan != null
&& (!cfg.wan.ipv6.enable || cfg.wan.ipv6.transport == "ppp")
);
message = "router: the WAN interface `${cfg.wan.interface}` is also used by a LAN (only allowed for PPPoE on a VLAN, with IPv6 disabled or inside the PPP session).";
}
{
assertion = cfg.wan.ipv6.transport == "native" || cfg.wan.ipv4.type == "pppoe";
message = "router: wan.ipv6.transport = \"ppp\" needs a PPPoE uplink (wan.ipv4.type = \"pppoe\").";
}
{
assertion =