nixos/network-interfaces: reflect negative settings of `proxyARP`

Currently, setting `proxyARP` to true enables `proxy_arp`, but setting
it to false doesn't disable it. This is surprising and stateful.

1 files changed, 2 insertions, 2 deletions

diff --git a/nixos/modules/tasks/network-interfaces.nix b/nixos/modules/tasks/network-interfaces.nix
index e2a17c246bd94..74df1cb05509d 100644
--- a/nixos/modules/tasks/network-interfaces.nix
+++ b/nixos/modules/tasks/network-interfaces.nix
@@ -1352,8 +1352,8 @@ in
       "net.ipv6.conf.default.disable_ipv6" = mkDefault (!cfg.enableIPv6);
       # networkmanager falls back to "/proc/sys/net/ipv6/conf/default/use_tempaddr"
       "net.ipv6.conf.default.use_tempaddr" = tempaddrValues.${cfg.tempAddresses}.sysctl;
-    } // listToAttrs (flip concatMap (filter (i: i.proxyARP) interfaces)
-        (i: [(nameValuePair "net.ipv4.conf.${replaceChars ["."] ["/"] i.name}.proxy_arp" true)]))
+    } // listToAttrs (forEach interfaces
+        (i: nameValuePair "net.ipv4.conf.${replaceChars ["."] ["/"] i.name}.proxy_arp" i.proxyARP))
       // listToAttrs (forEach interfaces
         (i: let
           opt = i.tempAddress;