ARP cache timeout changed in Windows Vista and 2008

You might remember that Address Resolution Protocol (ARP) has a local cache that prevents broadcasting for a system whose MAC address has been resolved. Older versions of Windows used to have a timeout of 2 minutes for ARP entries (up to 10 minutes), this has changed. Vista and 2008 has lowered this time to a random value between 15 seconds and 45 seconds:

Free TCP/IP book

Microsoft has placed a free TCP/IP fundamentals for download. Enjoy:

TCP/IP port range in Vista and Win2k8

According to KB929851 the dynamic range of TCP/UDP ports to be used byapplications on Vista or Win2k8 has changed from 1025 to 5000 to 49152 to65535. The port ranges can be viewed by using the following commands: •netsh int ipv4 show dynamicport tcp •netsh int ipv4 show dynamicport udp •netsh int ipv6 show dynamicport tcp •netsh int ipv6 show dynamicport udp In addition to that the port ranges can be changed by using the followingcommands: •netsh int ipv4 set dynamicport tcp start=X num=Y •netsh int ipv4 set dynamicport udp start=X num=Y •netsh int ipv6 set dynamicport tcp start=X num=Y •netsh … Continue reading TCP/IP port range in Vista and Win2k8