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Windows Vista Cannot Obtain IP Address

Written by Erica St. John on July 14, 2011 – 11:05

Windows Vista cannot obtain an IP Address from certain routers or from certain non-Microsoft DHCP servers

Consider the following scenario:

  • You connect a Windows Vista-based computer to a network.
  • A router or other device that is configured as a Dynamic Host Configuration Protocol (DHCP) server is configured on the network.
  • The router or the other device does not support the DHCP BROADCAST flag.

In this scenario, Windows Vista cannot obtain an IP address.

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TTL Info and Default

Written by Erica St. John on March 21, 2011 – 21:21

Requirements for Internet Hosts — Communication Layers (RFC 1122, R. Braden, Oct 89):


The IP layer MUST provide a means for the transport layer to set the TTL field of every datagram that is sent. When a fixed TTL value is used, it MUST be configurable. The current suggested value will be published in the “Assigned Numbers”  RFC.


A fixed value must be at least big enough for the Internet “diameter,” i.e., the longest possible path. A reasonable value is about twice the diameter, to allow for continued Internet growth.

Assigned Numbers (RFC 1700, J. Reynolds, J. Postel, October 1994):
page 64:


The current recommended default time to live (TTL) for the
Internet Protocol (IP) [45,105] is 64.


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