From 39fec47f876d6364926b99f8411761a44ab49888 Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@fri.uni-lj.si>
Date: Wed, 7 May 2025 12:25:43 +0200
Subject: [PATCH] =?UTF-8?q?alpine:=20don=E2=80=99t=20set=20IPv6=20gateway?=
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Will get it from RA. Also don’t disable SLAAC for IPv4‐only interfaces.
---
 roles/alpine/templates/interfaces.j2 | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/roles/alpine/templates/interfaces.j2 b/roles/alpine/templates/interfaces.j2
index 57568cb..2c883ed 100644
--- a/roles/alpine/templates/interfaces.j2
+++ b/roles/alpine/templates/interfaces.j2
@@ -4,15 +4,21 @@ iface lo inet loopback
 {% for iface in interfaces | selectattr('enabled') %}
 auto {{ iface.name }}
 iface {{ iface.name }} inet static
-{% for ip in iface.ip_addresses %}
-    address {{ ip.address }}
-{% set subnet = ip.address | ipaddr('subnet') %}
+{% for address in iface.ip_addresses %}
+    address {{ address.address }}
+{% if address.family.value == 4 %}
+{% set subnet = address.address | ipaddr('subnet') %}
 {% set prefix = prefixes | selectattr('prefix', '==', subnet) | first %}
 {% set gateway = prefix.custom_fields.gateway.address %}
-{% if gateway is defined and gateway != ip.address %}
+{% if gateway is defined and gateway != address.address %}
     gateway {{ gateway | ipaddr('address') }}
 {% endif %}
-{% endfor %}
+{% endif %}
+{% endfor -%}
+
+{# disable SLAAC if we have a manually set IPv6 address #}
+{% if iface.ip_addresses | selectattr("family.value", "==", 6) %}
     pre-up echo 0 > /proc/sys/net/ipv6/conf/$IFACE/autoconf
+{% endif %}
 
 {% endfor %}