Microsoft Windows 2000: New Features in TCPIP Implementation Chad Beeder Support Professional Micros

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Microsoft Windows 2000 New Features in TCP/IP
ImplementationChad BeederSupport
ProfessionalMicrosoft Platforms
SupportMicrosoft Corporation
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Whats New In Windows 2000 TCP/IP

• Dynamic DNS
• Automatic Private IP Addressing (APIPA)
• Network Address Translation (NAT)
• IP Security (IPSec)
• Quality of Service (QoS)
• Performance improvements
• And more

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Dynamic DNS

• Open standard, described in RFC 2136
• WINS still supported for backwards compatibility
• Clients can register their names with DNS Server
• DHCP Server can register names for down-level
  clients

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Automatic Private IP Addressing (APIPA)

• Commonly referred to as AutoNet
• Introduced with Windows 98
• Ideal for small networks without DHCP
• Designed for single-segment networks
• 169.254.x.x Address Range

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Network Address Translation

• Two forms of NAT
• Internet Connection Sharing (ICS)
• Introduced with Windows 98 Second Edition
• Included with all versions of Windows 2000
• Limited configuration options
• For small networks
• Full NAT
• Part of RRAS (Routing Remote Access Service)
• Included with Servers only

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IP Security (IPSec)

• Encrypts data at the IP Layer
• Transparent to applications
• Configured locally or through Active Directory
  group policies
• Typically uses Kerberos authentication
• May be handled in Hardware to reduce processing
  overhead

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Quality of Service (QoS)

• Allows applications to reserve bandwidth
• Ideal for streaming audio and video
• Several QoS mechanisms supported
• RSVP (Resource Reservation Protocol)
• DiffServ (Differentiated Services)
• IEEE 802.1p
• etc.
• QoS mechanisms abstracted through generic QoS
  (GQoS) API

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Performance Improvements

• Increased default window sizes
• TCP scalable window sizes (RFC 1323)
• Off by default
• Selective Acknowledgement (SACK) (RFC 2018)
• Important when using large window sizes
• TCP Fast Retransmit
• Many required reboots eliminated
• And more!

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