Network Time Protocol (NTP) Commands
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Option 33: Dual Internal NTP Server Setup and Operation Guidelines
-DISCONTINUED PRODUCT- Option 33: Dual Internal NTP Server Setup and Operation Guidelines Document No. PD0042100D – April 2009 Arbiter Systems, Inc. 1324 Vendels Circle, Suite 121 Paso Robles, CA 93446 U.S.A. (805) 237-3831, (800) 321-3831 http://www.arbiter.com mailto: [email protected] 1 Option 33: Dual Internal NTP Server 1.1 General Description Option 33, Dual Internal Network Time Protocol (NTP) Server, is used in the Arbiter Systems line of 19-inch, rack mount Satellite-Controlled Clocks. This option comes with a six-foot phone cable and RJ-11 to DB-9F adapter for connecting to the RS-232, or NTP Setup, port. 1.1.1 Option 33 Option 33 allows the clock to act as time server over an Ethernet network using the network time protocol operating in server mode - symmetric operation modes are not supported. Time is distributed over the network interface to computers, controllers and other equipment needing the correct time. Option 33 understands NTP Version 1, Version 2, and Version 3 frames, and optionally supports authentication via DES and MD5 cryptographic checksums. If authentication is not used, the controller can typically be used for hundreds of clients without overloading it. Authentication requires typically 40 ms for checking and generating the cryptograms, which is covered and averaged out by the protocol. Option 33 supports full SNTP and all NTP functions required for reliable server operation. Functions not required for server operation are not implemented. 1.1.2 Hardware Configuration. Option 33 consists of two building blocks; two OEM NTP modules and an interface to the GPS clock. -
Disk Clone Industrial
Disk Clone Industrial USER MANUAL Ver. 1.0.0 Updated: 9 June 2020 | Contents | ii Contents Legal Statement............................................................................... 4 Introduction......................................................................................4 Cloning Data.................................................................................................................................... 4 Erasing Confidential Data..................................................................................................................5 Disk Clone Overview.......................................................................6 System Requirements....................................................................................................................... 7 Software Licensing........................................................................................................................... 7 Software Updates............................................................................................................................. 8 Getting Started.................................................................................9 Disk Clone Installation and Distribution.......................................................................................... 12 Launching and initial Configuration..................................................................................................12 Navigating Disk Clone.....................................................................................................................14 -
Netflix and Twitch Traffic Characterization
University of Calgary PRISM: University of Calgary's Digital Repository Graduate Studies The Vault: Electronic Theses and Dissertations 2015-09-30 NetFlix and Twitch Traffic Characterization Laterman, Michel Laterman, M. (2015). NetFlix and Twitch Traffic Characterization (Unpublished master's thesis). University of Calgary, Calgary, AB. doi:10.11575/PRISM/27074 http://hdl.handle.net/11023/2562 master thesis University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission. Downloaded from PRISM: https://prism.ucalgary.ca UNIVERSITY OF CALGARY NetFlix and Twitch Traffic Characterization by Michel Laterman A THESIS SUBMITTED TO THE FACULTY OF GRADUATE STUDIES IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE GRADUATE PROGRAM IN COMPUTER SCIENCE CALGARY, ALBERTA SEPTEMBER, 2015 c Michel Laterman 2015 Abstract Streaming video content is the largest contributor to inbound network traffic at the University of Calgary. Over five months, from December 2014 { April 2015, over 2.7 petabytes of traffic on 49 billion connections was observed. This thesis presents traffic characterizations for two large video streaming services, namely NetFlix and Twitch. These two services contribute a significant portion of inbound bytes. NetFlix provides TV series and movies on demand. Twitch offers live streaming of video game play. These services share many characteristics, including asymmetric connections, content delivery mechanisms, and content popularity patterns. -
Your Performance Task Summary Explanation
Lab Report: 11.2.5 Manage Files Your Performance Your Score: 0 of 3 (0%) Pass Status: Not Passed Elapsed Time: 6 seconds Required Score: 100% Task Summary Actions you were required to perform: In Compress the D:\Graphics folderHide Details Set the Compressed attribute Apply the changes to all folders and files In Hide the D:\Finances folder In Set Read-only on filesHide Details Set read-only on 2017report.xlsx Set read-only on 2018report.xlsx Do not set read-only for the 2019report.xlsx file Explanation In this lab, your task is to complete the following: Compress the D:\Graphics folder and all of its contents. Hide the D:\Finances folder. Make the following files Read-only: D:\Finances\2017report.xlsx D:\Finances\2018report.xlsx Complete this lab as follows: 1. Compress a folder as follows: a. From the taskbar, open File Explorer. b. Maximize the window for easier viewing. c. In the left pane, expand This PC. d. Select Data (D:). e. Right-click Graphics and select Properties. f. On the General tab, select Advanced. g. Select Compress contents to save disk space. h. Click OK. i. Click OK. j. Make sure Apply changes to this folder, subfolders and files is selected. k. Click OK. 2. Hide a folder as follows: a. Right-click Finances and select Properties. b. Select Hidden. c. Click OK. 3. Set files to Read-only as follows: a. Double-click Finances to view its contents. b. Right-click 2017report.xlsx and select Properties. c. Select Read-only. d. Click OK. e. -
Network Time Protocol (NTP) General Overview
Network Time Protocol (NTP) General Overview David L. Mills University of Delaware http://www.eecis.udel.edu/~mills mailto:[email protected] alautun, Maya glyph 2-Aug-04 1 Introduction z Network Time Protocol (NTP) synchronizes clocks of hosts and routers in the Internet. z NIST estimates 10-20 million NTP servers and clients deployed in the Internet and its tributaries all over the world. Every Windows/XP has an NTP client. z NTP provides nominal accuracies of low tens of milliseconds on WANs, submilliseconds on LANs, and submicroseconds using a precision time source such as a cesium oscillator or GPS receiver. z NTP software has been ported to almost every workstation and server platform available today - from PCs to Crays - Unix, Windows, VMS and embedded systems, even home routers. z The NTP architecture, protocol and algorithms have been evolved over the last two decades to the latest NTP Version 4 described in this and related briefings. 2-Aug-04 2 The Sun never sets on NTP z NTP is argueably the longest running, continuously operating, ubiquitously available protocol in the Internet – USNO and NIST, as well as equivalents in other countries, provide multiple NTP primary servers directly synchronized to national standard cesium clock ensembles and GPS – Over 230 Internet primary serversare in Australia, Canada, Chile, France, Germany, Isreal, Italy, Holland, Japan, Norway, Sweden, Switzerland, UK, and US. z Well over a million Internet servers and clients all over the world – National and regional service providers BBN, MCI, Sprint, Alternet, etc. – Agencies and organizations: US Weather Service, US Treasury Service, IRS, PBS, Merrill Lynch, Citicorp, GTE, Sun, DEC, HP, etc. -
Which Time Server Option Is Best for Synchronizing Your Clocks
WHICH TIME SERVER OPTION IS BEST FOR SYNCHRONIZING YOUR CLOCKS? Any electronic device that automatically displays REGARDING MASTER the current local time – your clocks, phone, tablet, TIME CONTROLLERS computer and even most TVs – has to pull that time from a time server. AND The time server acts as a messenger of sorts; IP NETWORK CLOCKS it reads the time from a reference clock and distributes that information via a computer network (ETHERNET OR WI-FI) to your device when the device requests it. The time server could be a local network time server or an internet time server. SNTP, or Simple Network Time Protocol, is an internet standard protocol that allows a clock or device to contact a server and get the current time. It’s a simplification of the more robustNTP (Network Time Protocol) and is used in most embedded devices and computers. Once the device receives the current Coordinated Universal Time (UTC), the device applies offsets such as time zone or daylight saving time considerations, as well as the time spent on the network retrieving the time, before displaying the accurate local time. January 2018 AMERICAN TIME WHITE PAPER BY: MAX BLOM When it comes to syncing time for your organization’s clocks, you have 3 options: Let’s take a look at how each of these options work, their pros and cons, and our recommendation. Port 123 is reserved specifically for External Server IP Address NTP/SNTP communication 1 The NIST – the U.S. Department of Commerce’s National Institute of Standards and Technology – is the primary source for synchronizing time systems in the U.S. -
Networkingsimple Network Time Protocol
IBM i Version 7.2 Networking Simple Network Time Protocol IBM Note Before using this information and the product it supports, read the information in “Notices” on page 11. This document may contain references to Licensed Internal Code. Licensed Internal Code is Machine Code and is licensed to you under the terms of the IBM License Agreement for Machine Code. © Copyright International Business Machines Corporation 1998, 2013. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Simple Network Time Protocol...............................................................................1 PDF file for Simple Network Time Protocol.................................................................................................1 SNTP concepts............................................................................................................................................. 1 SNTP client............................................................................................................................................. 2 SNTP server............................................................................................................................................ 2 Scenario: Synchronizing clocks with IBM i..................................................................................................3 Configuring System A as an SNTP client and server..............................................................................5 Configuring -
NBAR2 Standard Protocol Pack 1.0
NBAR2 Standard Protocol Pack 1.0 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 © 2013 Cisco Systems, Inc. All rights reserved. CONTENTS CHAPTER 1 Release Notes for NBAR2 Standard Protocol Pack 1.0 1 CHAPTER 2 BGP 3 BITTORRENT 6 CITRIX 7 DHCP 8 DIRECTCONNECT 9 DNS 10 EDONKEY 11 EGP 12 EIGRP 13 EXCHANGE 14 FASTTRACK 15 FINGER 16 FTP 17 GNUTELLA 18 GOPHER 19 GRE 20 H323 21 HTTP 22 ICMP 23 IMAP 24 IPINIP 25 IPV6-ICMP 26 IRC 27 KAZAA2 28 KERBEROS 29 L2TP 30 NBAR2 Standard Protocol Pack 1.0 iii Contents LDAP 31 MGCP 32 NETBIOS 33 NETSHOW 34 NFS 35 NNTP 36 NOTES 37 NTP 38 OSPF 39 POP3 40 PPTP 41 PRINTER 42 RIP 43 RTCP 44 RTP 45 RTSP 46 SAP 47 SECURE-FTP 48 SECURE-HTTP 49 SECURE-IMAP 50 SECURE-IRC 51 SECURE-LDAP 52 SECURE-NNTP 53 SECURE-POP3 54 SECURE-TELNET 55 SIP 56 SKINNY 57 SKYPE 58 SMTP 59 SNMP 60 SOCKS 61 SQLNET 62 SQLSERVER 63 SSH 64 STREAMWORK 65 NBAR2 Standard Protocol Pack 1.0 iv Contents SUNRPC 66 SYSLOG 67 TELNET 68 TFTP 69 VDOLIVE 70 WINMX 71 NBAR2 Standard Protocol Pack 1.0 v Contents NBAR2 Standard Protocol Pack 1.0 vi CHAPTER 1 Release Notes for NBAR2 Standard Protocol Pack 1.0 NBAR2 Standard Protocol Pack Overview The Network Based Application Recognition (NBAR2) Standard Protocol Pack 1.0 is provided as the base protocol pack with an unlicensed Cisco image on a device. -
New Milestone in Network Time Security As Internet Draft Approved
New milestone in Network Time Security as Internet Draft approved Stockholm, Sweden - 27 March 2020- Netnod, a leading provider of interconnection and DNS services, is pleased to announce that the Internet Draft ‘Network Time Security for the Network Time Protocol’ has been approved as a Proposed Standard. The approval came from the Internet Engineering Steering Group (IESG) on 25 March during the virtual IETF meeting. Netnod staff have been instrumental in developing this protocol which adds a much needed layer of security to the Network Time Protocol (NTP) and follows from Netnod’s launch of one of the first NTS-enabled NTP services in October 2019. The new standard (https://tools.ietf.org/html/draft-ietf-ntp-using-nts-for-ntp-28) adds an important layer of security to NTP in a similar way that Transport Layer Security (TLS) adds security to the Hypertext Transfer Protocol (HTTP), which users can see in their web browsers as a closed padlock. As described in the Proposed Standard, NTS is: ”a mechanism for using Transport Layer Security (TLS) and Authenticated Encryption with Associated Data (AEAD) to provide cryptographic security for the client-server mode of the Network Time Protocol (NTP).” NTP, the most popular protocol in use for synchronizing time, is more than 30 years old and vulnerable to Man-in-the-Middle (MITM) attacks. With many of today’s most important security processes dependent on accurate time, the consequences of receiving time from a malicious source are serious. Everything from establishing encrypted TLS sessions and using DNSSEC to time-stamping financial transactions and preventing online fraud depends on accurate and secure time. -
Introduction to Computer Networking
www.PDHcenter.com PDH Course E175 www.PDHonline.org Introduction to Computer Networking Dale Callahan, Ph.D., P.E. MODULE 7: Fun Experiments 7.1 Introduction This chapter will introduce you to some networking experiments that will help you improve your understanding and concepts of networks. (The experiments assume you are using Windows, but Apple, Unix, and Linux systems will have similar commands.) These experiments can be performed on any computer that has Internet connectivity. The commands can be used from the command line using the command prompt window. The commands that can be used are ping, tracert, netstat, nslookup, ipconfig, route, ARP etc. 7.2 PING PING is a network tool that is used on TCP/IP based networks. It stands for Packet INternet Groper. The idea is to verify if a network host is reachable from the site where the PING command issued. The ping command uses the ICMP to verify if the network connections are intact. When a PING command is issued, a packet of 64 bytes is sent to the destination computer. The packet is composed of 8 bytes of ICMP header and 56 bytes of data. The computer then waits for a reply from the destination computer. The source computer receives a reply if the connection between the two computers is good. Apart from testing the connection, it also gives the round trip time for a packet to return to the source computer and the amount of packet loss [19]. In order to run the PING command, go to Start ! Run and in the box type “cmd”. -
TB-1052 Digital Video Systems
IRIS TECHNICAL BULLETIN TB-1052 Digital Video Systems Subject: Installing and Running Check Disk on XP Embedded Systems Hardware: TotalVision-TS Software: IRIS DVS XPe Ver. 11.04 and Earlier (Including FX and non-FX Units) Release Date: 12/22/08 SUMMARY IRIS DVS units initially produced prior to January 1, 2009 may not have complete support for running chkdsk.exe even though the chkdsk.exe file exist in the Windows/System32 directory. This Technical Bulletin describes how to install and run the Check Disk (ChkDsk) utility to minimize file corruption problems and potential RAW Disk failures. INSTALLING SOFTWARE Several additional files are needed to be installed on the DVS hard drive. You can get a copy of these files at the IRIS Web Service Site www.SecurityTexas.com/service. Download the “Check Disk Upgrade” package and follow the instructions in the ReadMe file of that zip file on how to upgrade the files on the DVS. Once the files are copied to the hard drive, highlight the file “EVENTVWR.MSC” and then select “File- >Pin to Start Menu” to provide an easy way to access the Event Viewer. After the required software has been installed run Windows File Explorer and select the C:\BankIRIS_NT directory. Double-click on the AUTOCHECK.REG file. Answer YES in response to the two prompts to update the registry. Expert Mode: To verify that the registry changes were done you can select “Start->Run” and type in “RegEdit.exe” to run the Registry Editor. Select the key “HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Sesion Manager”. Select the key "BootExecute". -
Service Information
Service Information VAS Tester Number: AVT-14-20 Subject: VAS Diagnostic Device Hard Disc Maintenance Date: Sept. 24, 2014 Supersedes AVT-12-12 due to updated information. 1.0 – Introduction If persistent diagnostic software or Windows® 7 operating system error messages are displayed while installing or using the diagnostic software, use the Windows CHKDSK utility to check hard disk integrity and fix logical file system errors. CHKDSK can also handle some physical errors and may be able to recover lost data that is readable. We recommend the CHKDSK utility be run on a regular basis on all VAS diagnostic devices in service. Consult with your dealership Systems Administrator or IT Professional about checking the integrity of the hard disk as described below on a regular basis, as well as regular performance of the Windows DEFRAG utility. 2.0 – Procedure Prerequisites: Device plugged into power adapter and booted to Windows desktop 1. Go to Windows Start > Computer 2. Right click/select Local Disk (C:) and select Properties from the dropdown menu: Continued… 2/ Page 1 of 3 © 2014 Audi of America, Inc. All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.