Article ID: 841804
If your Microsoft Windows XP-based computer is running Routing Information Protocol (RIP) Listener, RIP Listener may not update the route table with new route information.
This issue may occur if a firewall is preventing RIP Listener from receiving route information that is sent by routers that are using RIP version 1. When you install Windows XP Service Pack 2 (SP2), Windows Firewall is turned on. If your computer has Windows Firewall or another firewall turned on, incoming UDP port 520 may be blocked.
For additional information about other problems with RIP Listener, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/811156/ )Route table on a Windows XP-based computer that is configured as a Remote Access Server is not updated with new route information