diff --git a/protocols/nefarious.py b/protocols/nefarious.py
index b4e7e9b..67adcb1 100644
--- a/protocols/nefarious.py
+++ b/protocols/nefarious.py
@@ -846,6 +846,10 @@ class P10Protocol(IRCS2SProtocol):
             return
 
         else:  # Send a hook with the hook arguments given by the handler function.
+            if self.irc.isInternalClient(sender) or self.irc.isInternalServer(sender):
+                log.warning("(%s) Received command %s being routed the wrong way!", self.irc.name, command)
+                return
+
             parsed_args = func(sender, command, args)
             if parsed_args is not None:
                 return [sender, command, parsed_args]
diff --git a/protocols/ts6_common.py b/protocols/ts6_common.py
index de73667..539673f 100644
--- a/protocols/ts6_common.py
+++ b/protocols/ts6_common.py
@@ -330,6 +330,10 @@ class TS6BaseProtocol(IRCS2SProtocol):
             command = args[0]
             args = args[1:]
 
+        if self.irc.isInternalClient(numeric) or self.irc.isInternalServer(numeric):
+            log.warning("(%s) Received command %s being routed the wrong way!", self.irc.name, command)
+            return
+
         if command == 'ENCAP':
             # Special case for encapsulated commands (ENCAP), in forms like this:
             # <- :00A ENCAP * SU 42XAAAAAC :GLolol