| Directory > Computers > Internet > Protocols > NTP Hardening Cisco Routers - Chapter 10 - NTP
Sample chapter from the book, showing the cisco-specific methods of configuring your routers to
support using NTP time synchronization
http://www.oreilly.com/catalog/hardcisco/chapter/ch10.html
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Home of the Network Time Protocol
Home for the NTP software package, the official reference implementation of the NTP protocol.
http://www.ntp.org/
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ELPROMA NTP Servers
Manufacturer of NTP Time Servers.
http://www.ntp-servers.com/
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pool.ntp.org: Public DNS round-robin Time project
A collection of public ntp servers provided by users and ISP's placed in a round-robin under
pool.ntp.org.
http://fortytwo.ch/time
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Symmetricom, Inc.
Offers a variety of timing equipment including dedicated NTP servers.
http://www.symmetricom.com
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Network Time Synchronization Project
This group is working on the next version of NTP to improve robustness.
http://www.eecis.udel.edu/~mills/ntp.html
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Public NTP Time Servers
A list of publicly available stratum 1 and 2 Network Time Protocol servers.
http://www.eecis.udel.edu/~mills/ntp/servers.html
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Welcome To Steatite Time And Frequency
Steatite's Time and Frequency division provide high performance Time, Frequency and NTP Systems.
http://www.time-frequency.co.uk
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NTP - The Network Time Protocol
A good information page about NTP and network synchronization. With examples for the NTP
configuration with a NTP Timeserver or GPS controlled time sources.
http://www.ntp-zeit.de/index_en.htm
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Configuring Network Time Protocol (NTP) service
A detailed information page about the guidelines for implementing NTP.
http://docsrv.caldera.com/NET_tcpip/CTOC-ntpN.ntp.html
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NTP with TymServer
Ntp time server, time synchronization and network time protocol, TymServe software solutions
provided for added security behind the firewall.
http://www.tymserve.com
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Beginner's Guide to Network Time Protocol
A tutorial on installing NTP servers on UNIX (OpenBSD and Linux) and Windows to accurately
synchronize computer times.
http://geodsoft.com/howto/timesync/
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Meinberg radio clocks and NTP time server
Develops and manufactures time and frequency products, NTP time servers, radio clocks synchronized
by DCF77 or GPS, slotcards, standalone systems and customer specific solutions for all time
synchronizing needs.
http://www.meinberg.de/english/
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Time Synchronization Through the Network
This page helps with configuration of ntp-software in SuSE Linux distribution.
http://sdb.suse.de/en/sdb/html/xntp.html
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Secure Network Time Protocol (stime) Charter
Information and drafts from the IETF Working Group pursuing authenticated distribution of time
information.
http://www.ietf.org/html.charters/stime-charter.html
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Network Time Protocol at the University of Michigan
A discussion of why and how to set up NTP software.
http://www.umich.edu/~rsug/services/ntp.html
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Network Time Protocol Version 3
Aimed primarily at helping internal BNL users with NTP, this page provides useful setup information
for various flavors of Unix.
http://www.ccd.bnl.gov/xntp/
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RFC2030 - Simple Network Time Protocol Version 4
The current standard for SNTP, a version of the protocol for implementations which do not need all
of the features of NTP. Available here in HTML, PDF, and Postscript formats.
http://www.faqs.org/rfcs/rfc2030.html
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RFC1305 - Network Time Protocol (Version 3)
The current NTP standard. Available here in HTML, PDF, and Postscript formats.
http://www.faqs.org/rfcs/rfc1305.html
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Time Service Department
The official source of time used in the United States and provides time services in various ways,
including through NTP.
http://tycho.usno.navy.mil/time.html
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Brandywine Communications
Offers advanced off-the-shelf and custom time and frequency solutions including Network Time
Protocol servers.
http://brandywinecomm.com/
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EndRun Technologies
Offers timing equipment designed to work in conjunction with NTP.
http://www.endruntechnologies.com/
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Date and Time Gateway
A list of time zone specifications which ship with BSD and the current time in each.
http://www.bsdi.com/date/
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