add san vlan pour servir cephfs et san

hosts/physiques/cephiroth/networking.nix

@@ -59,6 +59,16 @@
           ];
         };
       };
+      san = {
+        ipv4 = {
+          addresses = [
+            {
+              address = "172.16.4.3";
+              prefixLength = 24;
+            }
+          ];
+        };
+      };
     };
     defaultGateway = "172.16.3.99";
     nameservers = [ "172.16.10.128" ];