From d074d3f29292d785f3fc3dd1df8ff925da27b196 Mon Sep 17 00:00:00 2001
From: Tom Frenzel <40773830+tomfrenzel@users.noreply.github.com>
Date: Sun, 31 May 2026 14:10:55 +0200
Subject: [PATCH] fix(openthread-br): use correct ipv6 configuration (#14829)

---
 ct/openthread-br.sh              | 21 +++++++++++++++++++++
 install/openthread-br-install.sh | 11 +++++++++++
 2 files changed, 32 insertions(+)

diff --git a/ct/openthread-br.sh b/ct/openthread-br.sh
index 662f9837b..c0156183c 100644
--- a/ct/openthread-br.sh
+++ b/ct/openthread-br.sh
@@ -70,6 +70,27 @@ function update_script() {
   $STD ninja install
   msg_ok "Rebuilt OpenThread Border Router"
 
+  if ! grep -q "net.ipv6.conf.all.accept_ra=2" /etc/sysctl.d/99-otbr.conf; then
+    msg_info "Configuring Network"
+    cat <<EOF >/etc/sysctl.d/99-otbr.conf
+net.ipv6.conf.all.forwarding=1
+net.ipv6.conf.all.accept_ra=2
+net.ipv6.conf.all.accept_ra_rtr_pref=1
+net.ipv6.conf.all.accept_ra_rt_info_max_plen=64
+net.ipv6.conf.default.forwarding=1
+net.ipv6.conf.default.accept_ra=2
+net.ipv6.conf.default.accept_ra_rtr_pref=1
+net.ipv6.conf.default.accept_ra_rt_info_max_plen=64
+net.ipv6.conf.eth0.forwarding=1
+net.ipv6.conf.eth0.accept_ra=2
+net.ipv6.conf.eth0.accept_ra_rtr_pref=1
+net.ipv6.conf.eth0.accept_ra_rt_info_max_plen=64
+net.ipv4.ip_forward=1
+EOF
+    $STD sysctl -p /etc/sysctl.d/99-otbr.conf
+    msg_ok "Configured Network"
+  fi
+
   msg_info "Starting Services"
   systemctl start otbr-agent
   systemctl start otbr-web
diff --git a/install/openthread-br-install.sh b/install/openthread-br-install.sh
index 82c3fea45..779bb3951 100644
--- a/install/openthread-br-install.sh
+++ b/install/openthread-br-install.sh
@@ -67,6 +67,17 @@ msg_ok "Built OpenThread Border Router"
 msg_info "Configuring Network"
 cat <<EOF >/etc/sysctl.d/99-otbr.conf
 net.ipv6.conf.all.forwarding=1
+net.ipv6.conf.all.accept_ra=2
+net.ipv6.conf.all.accept_ra_rtr_pref=1
+net.ipv6.conf.all.accept_ra_rt_info_max_plen=64
+net.ipv6.conf.default.forwarding=1
+net.ipv6.conf.default.accept_ra=2
+net.ipv6.conf.default.accept_ra_rtr_pref=1
+net.ipv6.conf.default.accept_ra_rt_info_max_plen=64
+net.ipv6.conf.eth0.forwarding=1
+net.ipv6.conf.eth0.accept_ra=2
+net.ipv6.conf.eth0.accept_ra_rtr_pref=1
+net.ipv6.conf.eth0.accept_ra_rt_info_max_plen=64
 net.ipv4.ip_forward=1
 EOF
 $STD sysctl -p /etc/sysctl.d/99-otbr.conf