diff --git a/pacman/model/resources/iptag_resource.py b/pacman/model/resources/iptag_resource.py
index 72a5d2ead..4e6ea3206 100644
--- a/pacman/model/resources/iptag_resource.py
+++ b/pacman/model/resources/iptag_resource.py
@@ -36,7 +36,7 @@ class IPtagResource(object):
         "_traffic_identifier")
 
     def __init__(
-            self, ip_address: Optional[str], port: Optional[int],
+            self, ip_address: str, port: int,
             strip_sdp: bool, tag: Optional[int] = None,
             traffic_identifier: str = "DEFAULT"):
         """
@@ -60,7 +60,7 @@ def __init__(
         self._traffic_identifier = traffic_identifier
 
     @property
-    def ip_address(self) -> Optional[str]:
+    def ip_address(self) -> str:
         """
         The IP address to assign to the tag.
 
@@ -69,7 +69,7 @@ def ip_address(self) -> Optional[str]:
         return self._ip_address
 
     @property
-    def port(self) -> Optional[int]:
+    def port(self) -> int:
         """
         The port of the tag.
 
diff --git a/pacman/operations/tag_allocator_algorithms/basic_tag_allocator.py b/pacman/operations/tag_allocator_algorithms/basic_tag_allocator.py
index b4fa35a18..39a62065a 100644
--- a/pacman/operations/tag_allocator_algorithms/basic_tag_allocator.py
+++ b/pacman/operations/tag_allocator_algorithms/basic_tag_allocator.py
@@ -127,11 +127,9 @@ def __create_tag(
         tag: int) -> IPTag:
     ethernet_ip = eth_chip.ip_address
     assert ethernet_ip is not None
-    tag_ip = iptag.ip_address
-    assert tag_ip is not None
     return IPTag(
         ethernet_ip, placement.x, placement.y,
-        tag, tag_ip, iptag.port,
+        tag, iptag.ip_address, iptag.port,
         iptag.strip_sdp, iptag.traffic_identifier)