# \[PATCH 16/16 net-next v2\] ipv4: make CONFIG\_IPV4 boolean

- From: Fernando Fernandez Mancera \<hidden\>
- Date: 2026-09-28 19:32:40 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/09/17655746
- Thread: https://ratatoskr.run/netdev/2026/09/17655752/t.md

```text
Change CONFIG_IPV4 from hidden 'def_bool y' into an exposed boolean.
This allows users to explicitly disable IPv4 via Kconfig to build
IPv6-only. The default is kept at 'INET' to prevent breaking existing
configurations.

Signed-off-by: Fernando Fernandez Mancera <redacted>
---
 net/ipv4/Kconfig | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 51bf05d9770c..c7d36cfa4a1d 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -3,7 +3,15 @@
 # IP configuration
 #
 config IPV4
-	def_bool y
+	bool "The IPv4 protocol" if IPV6
+	default INET
+	help
+	  Support for IP version 4 (IPv4).
+
+	  Disabling this option compiles the kernel networking stack without
+	  IPv4 support, resulting in a IPv6-only system.
+
+	  If unsure, say Y.
 
 config IP_MULTICAST
 	bool "IP: multicasting"
-- 
2.55.0

```