diff --git a/src/osmo_gsm_tester/modem.py b/src/osmo_gsm_tester/modem.py
index 28f7f04..7e58e32 100644
--- a/src/osmo_gsm_tester/modem.py
+++ b/src/osmo_gsm_tester/modem.py
@@ -677,6 +677,7 @@
         iface = ctx_settings.get('Interface', None)
         if not iface:
             raise log.Error('%s Settings contains no iface! %r' % (ctx_id, repr(ctx_settings)))
+        util.move_iface_to_netns(iface, self.netns(), self.run_dir.new_dir('move_netns'))
         self.run_netns_wait('ifup', ('ip', 'link', 'set', 'dev', iface, 'up'))
         self.run_netns_wait('dhcp', ('udhcpc', '-q', '-i', iface))
 
diff --git a/src/osmo_gsm_tester/util.py b/src/osmo_gsm_tester/util.py
index 21653be..b0ce041 100644
--- a/src/osmo_gsm_tester/util.py
+++ b/src/osmo_gsm_tester/util.py
@@ -100,6 +100,17 @@
     proc = Process(SETCAP_NET_ADMIN_BIN, run_dir, ['sudo', SETCAP_NET_ADMIN_BIN, binary])
     proc.launch_sync()
 
+def move_iface_to_netns(ifname, netns, run_dir):
+    '''
+    Moves an iface to a netns. It creates the netns if it doesn't exist.
+    fail_iface_not_found=False is handy in order to assume the iface is already
+    in another netns and thus cannot be foud.
+    '''
+    from .process import Process
+    NETNS_SETUP_BIN = 'osmo-gsm-tester_netns_setup.sh'
+    proc = Process('move_netns', run_dir, ['sudo', NETNS_SETUP_BIN, ifname, netns])
+    proc.launch_sync()
+
 def import_path_prepend(pathname):
     dir = os.path.realpath(pathname)
     if dir not in sys.path: