1 files changed, 13 insertions, 0 deletions
diff --git a/test/util.py b/test/util.py
index a648490681d..3a8bd838b00 100644
--- a/test/util.py
+++ b/test/util.py
@@ -100,3 +100,16 @@ class Host(object):
         self._mac = mac
         self._ip4 = ip4
         self._ip6 = ip6
+
+
+class ForeignAddressFactory(object):
+    count = 0
+    prefix_len = 24
+    net_template = '10.10.10.{}'
+    net = net_template.format(0) + '/' + str(prefix_len)
+
+    def get_ip4(self):
+        if self.count > 255:
+            raise Exception("Network host address exhaustion")
+        self.count += 1
+        return self.net_template.format(self.count)