diff --git a/install/ipv6on-custom.sh b/install/ipv6on-custom.sh
index a7a06c7..a570088 100644
--- a/install/ipv6on-custom.sh
+++ b/install/ipv6on-custom.sh
@@ -17,8 +17,7 @@ echo "net.ipv6.conf.all.disable_ipv6 = 0" >> /etc/sysctl.conf
 echo "net.ipv6.conf.default.disable_ipv6 = 0" >> /etc/sysctl.conf
 echo "net.ipv6.conf.lo.disable_ipv6 = 0" >> /etc/sysctl.conf
 
-# Comentado para evitar conflicto
-# echo "net.ipv6.conf.eth0.disable_ipv6 = 1" >> /etc/sysctl.conf
+grep -qxF 'net.ipv6.conf.eth0.disable_ipv6 = 1' /etc/sysctl.conf || echo 'net.ipv6.conf.eth0.disable_ipv6 = 1' | sudo tee -a /etc/sysctl.conf
 
 # Aplicar los cambios de sysctl
 sysctl -p