Browse Prior Art Database

Traffic Reduction of Name Server Lookups over Low-Bandwidth Connections

IP.com Disclosure Number: IPCOM000118348D
Original Publication Date: 1996-Dec-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 83K

Publishing Venue

IBM

Related People

Woods, DR: AUTHOR

Abstract

With the staggering growth of internet users and the wide spread use of Transmission Control Protocol/Internet Protocol (TCP/IP) and User Diagram Protocol (UDP)/IP applications in today's corporate environments, many more users are trying to access the internet or corporate networks over low-bandwidth mediums such as land-line telephones or even slower and more costlier mobile choices such as circuit-switched cellular, Cellular Digital Packet Data (CDPD), packet-radio networks or satellite-based networks.

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Traffic Reduction of Name Server Lookups over Low-Bandwidth Connections

      With the staggering growth of internet users and the wide
spread use of Transmission Control Protocol/Internet Protocol
(TCP/IP) and User Diagram Protocol (UDP)/IP applications in today's
corporate environments, many more users are trying to access the
internet or corporate networks over low-bandwidth mediums such as
land-line telephones or even slower and more costlier mobile choices
such as circuit-switched cellular, Cellular Digital Packet Data
(CDPD), packet-radio networks or satellite-based networks.

      A weakness of the current IP stacks is the lack of awareness or
support for low-bandwidth and high latency access mediums.  This
becomes apparent when an application uses IP Names instead of IP
Addresses, which  require a mapping from the hostname to a dotted IP
address by a dialog  with a nameserver on the home or Local Area
Network (LAN) side of the link.

      A simple, but very revealing, demonstration of this problem can
be displayed by using the IBM ARTour Mobile Communications software,
which provides a medium access layer (Serial Line IP (SLIP) or
Network Drive Interface Specification (NDIS)) to packet radio modems
for an IP  stack with added authentication, compression, encryption,
operational status and packets sent and received.  To view the amount
of packets required for a name to address resolution across a packet
radio network,  from the client logon go to the ARTour Gateway and
open the Transmission  panel.  Then, from a command prompt execute
the host command to resolve  an IP name, such as "host www.ibm.com".
The results observed were 23 packets and 2086 bytes transmitted for
the first nameserver lookup and  a minimum of 11 packets and 1010
bytes transmitted for subsequent calls.  This translates into about
$1.32 for the first lookup and at least $.064 for each subsequent
lookup, using one of the U.S. packet radio network provider's retail
pricing plans.

      The currently available solution is for the mobile user to add
every hostname and IP address that they will access to the host's
file on their machine.  This is a viable solution only for users who
access very few IP hosts whose addresses are never changed.  This is
not a solution for internet users who surf f...