fix: local network address translation in discovery module (#767)

Signed-off-by: Frederico Araujo <[email protected]>

Author: araujof

mcpgateway/federation/discovery.py

@@ -65,6 +65,7 @@
 import asyncio
 from dataclasses import dataclass
 from datetime import datetime, timedelta, timezone
+import ipaddress
 import os
 import socket
 from typing import Dict, List, Optional
@@ -219,8 +220,10 @@ def _get_local_addresses(self) -> List[str]:
             # Get all network interfaces
             for iface in socket.getaddrinfo(socket.gethostname(), None):
                 addr = iface[4][0]
-                # Skip localhost
-                if not addr.startswith("127."):
+                ip_obj = ipaddress.ip_address(addr)
+                is_ipv4 = isinstance(ip_obj, ipaddress.IPv4Address)
+                # Skip localhost and non ipv4 addresses
+                if is_ipv4 and not addr.startswith("127."):
                     addresses.append(addr)
         except Exception as e:
             logger.warning(f"Failed to get local addresses: {e}")