diff --git a/debian-uncloud-image.sh b/debian-uncloud-image.sh
index acdf7ba..a3d462b 100755
--- a/debian-uncloud-image.sh
+++ b/debian-uncloud-image.sh
@@ -93,6 +93,9 @@ cat > /mnt/etc/hosts << EOF
 
 EOF
 
+# Accept router advertisements for SLAAC.
+run_root sysctl -w net.ipv6.conf.all.accept_ra=1
+
 # Configure package sources and update package index.
 cat >/mnt/etc/apt/sources.list <<EOF
 deb $APT_MIRROR $RELEASE main
diff --git a/fedora-uncloud-image.sh b/fedora-uncloud-image.sh
index 2049410..a60d687 100755
--- a/fedora-uncloud-image.sh
+++ b/fedora-uncloud-image.sh
@@ -99,7 +99,10 @@ cat > /mnt/etc/hosts << EOF
 
 EOF
 
-# Initalize base services.
+# Accept router advertisements for SLAAC.
+run_root sysctl -w net.ipv6.conf.all.accept_ra=1
+
+# Initialize base services.
 run_root systemd-machine-id-setup
 
 run_root ln -sf /usr/share/zoneinfo/UTC /etc/localtime
diff --git a/ubuntu-unclound-image.sh b/ubuntu-unclound-image.sh
index 61edc7c..bfd5bc0 100755
--- a/ubuntu-unclound-image.sh
+++ b/ubuntu-unclound-image.sh
@@ -93,6 +93,9 @@ cat > /mnt/etc/hosts << EOF
 
 EOF
 
+# Accept router advertisements for SLAAC.
+run_root sysctl -w net.ipv6.conf.all.accept_ra=1
+
 # Configure package sources and update package index.
 cat >/mnt/etc/apt/sources.list <<EOF
 deb $APT_MIRROR $RELEASE main restricted universe multiverse