Web Server Organization.

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Web Server Organization. Section 4 Name Determination. Review. Comprehend the space name administration (DNS) Recognize the parts of DNS Arrange zone records Introduce and design DNS in Linux Comprehend name determination in Windows Introduce and arrange DNS in Windows 2000 and 2003
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Web Server Administration Chapter 4 Name Resolution

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Overview Understand the space name administration (DNS) Identify the segments of DNS Configure zone documents Install and arrange DNS in Linux Understand name determination in Windows Install and arrange DNS in Windows 2000 and 2003 Troubleshoot DNS Use WINS to determine PC names in Windows

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Understanding the DNS is utilized to guide host names to IP addresses on the Internet Also called name determination or location determination Whenever a host is included, a design document must be physically changed A host speaks to an administration on a server, for example, FTP or a Web server There can be numerous hosts on a solitary PC A Microsoft Windows 2000 or Windows 2003 system utilizes DNS to determine PC names on a LAN DNS in Windows is intended to be powerful - as PCs are added to the system, DNS consequently changes

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Clients On your PC, the TCP/IP setup contains the address(es) of your DNS server(s) Whenever you utilize a URL, whether in a program, or an utility, for example, ping, DNS servers are utilized

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Domain Namespaces The root level area is "." Significant in making DNS documents Top-level areas incorporate com, organization, fr More have been included 2000 Second-level spaces are frequently possessed by organizations and people microsoft.com, devry.edu A subdomain is a further division of a second-level area For devry.edu, there is phx.devry.edu Not regular

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Domain Namespaces Second-level spaces, for example, devry.edu have control over naming inside of their space Create has, for example, www, ftp, bb A name, for example, www.devry.edu is a completely qualified area name (FQDN) We could make subdomains, for example, phx www.phx.devry.edu

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New Top-Level Domains .biz - organizations .information - anybody can enroll .name - must enlist first and last name .ace - for experts just must give evidence .air, .exhibition hall, .coop are controlled by associations

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Host Names The first partition of a URL is normally a host name Typically unique in relation to the PC\'s name Many hosts can be connected with the same Web server

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How DNS Works

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DNS Components Name server – otherwise called DNS server backings name-to-deliver and location to-name determination Name resolver – additionally called DNS customer Can contact DNS server to lookup name Used by programs, email customers, and customer utilities, for example, ping and tracert

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DNS Servers that Define the Internet Primary and auxiliary servers store the host names utilized on the Internet Caching and sending servers hunt the Internet down host names

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Primary and Secondary Servers Primary Server Defines the hosts for the area Maintains the database for the area It has power for the area Secondary Server Gets information from essential server Provides adaptation to internal failure and burden dissemination Required for Internet areas

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Primary and Secondary Servers If you utilize DNS, you will frequently work with your ISP In a basic situation, the ISP will have the essential and optional DNS servers You get in touch with them for changes You can likewise part the servers ISP has essential, you have auxiliary You have essential, ISP has auxiliary

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Primary and Secondary Servers ISP keeps up DNS You need to send changes to ISP You have the auxiliary server which gets redesigns from the essential server Your clients reference your optional server which is speedier

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Primary and Secondary Servers You have complete control over DNS You can roll out improvements at whatever point you need If your essential DNS goes down, the optional will keep on working (yet not inconclusively)

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Resolve Host Names Caching Server Resolves host names Caches (spares) the outcomes Automatically introduced when DNS is introduced No design important Forwarding Server Caching server that has admittance to the Internet and advances activity from other reserving servers

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Caching and Forwarding Servers

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Zones A zone is an area\'s piece namespace For a space as little as technowidgets.com, the area name speaks to a solitary zone For vast associations, (for example, IBM), subdomains can be isolated into independently kept up zones Each zone ordinarily has a different DNS

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Zones must be bordering admin.devry.edu can be consolidated with devry.edu admin.devry.edu can\'t be joined with student.devry.edu There must be one essential DNS server in every zone (in addition to an auxiliary server) Each zone can have various auxiliary DNS servers

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Zone File Configuration Forward Lookup These zones contain passages that guide names to IP locations Reverse Lookup These zones contain sections that guide IP locations to names

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Common DNS Records

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DNS Configuration in Linux/and so on/named.conf portrays the documents that design the zones There are two essential documents that it depicts Forward lookup is portrayed by named.technowidgets.com It has the host names and how to handle email Reverse lookup is portrayed by named.0.168.192 Can be fundamental for email( (SMTP) and security programs

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/and so on/named.conf Creating a DNS for the technowidgets.com space Default setup is for localhost In named.conf add the accompanying line zone "technowidgets.com" { sort expert; record “named.technowidgets.com”; }; This permits technowidgets.com to be determined by/var/named/named.technowidgets.com There can be various spaces in a solitary named.conf record

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/and so forth/named.conf Also, we can add the accompanying line zone “0.168.192.in-addr.arpa” IN { sort expert; record “named.0.168.192”; }; This takes into account reverse lookup for the area It utilizes all or a piece of the system

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/var/named.technowidgets.com $TTL 86400 @ IN SOA web1.technowidgets.com. admn.technowidgets.com. ( 2002072100 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum IN NS web1 IN A IN MX 10 mail.technowidgets.com. web1 IN A www IN CNAME web1 research IN A IN MX 10 mail mail IN A

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named.0.168.192 $TTL 86400 @ IN SOA web1.technowidgets.com. admn.technowidgets.com. ( 2002072100 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum IN NS web1 100 IN PTR web1.technowidgets.com. 150 IN PTR research.technowidgets.com. 200 IN PTR mail.technowidgets.com.

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Starting DNS in Linux To begin DNS/and so on/rc.d/init.d/named begin To restart DNS/and so on/rc.d/init.d/named restart To stop DNS/and so on/rc.d/init.d/named stop Make DNS begin when you boot Linux Add the order to begin DNS to/and so on/rc.d/rc.local

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Configuring Client DNS in Linux Modify/and so on/resolv.config The accompanying line guides the customer to utilize the DNS server at nameserver The accompanying line relates this PC with the technowidgets.com space area technowidgets.com

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Test the DNS Configure a Windows PC to utilize the DNS server Start->Settings->Network and Dial-up Connections Right-tap on Local Area Connection and select Properties Select Internet Protocol (TCP/IP) and click on Properties Change DNS to Reboot and ping www.technowidgets.com

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Name Resolution in Windows NetBios (PC) names are show to the neighborhood system Starting with Windows NT, WINS database has PC name to IP address determination Windows 2000 presents Dynamic DNS is needed for Active Directory Services DNS as depicted for Linux can likewise be arranged Wizards guide you through the setup

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Finished DNS Configuration in Windows

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Troubleshooting DNS ping presentations name determination regardless of the fact that the PC can\'t be reached

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Troubleshooting DNS nslookup can show data from the DNS server

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Troubleshooting DNS burrow – accessible on Linux

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Summary DNS is an application that makes an interpretation of names to IP locations and IP locations to names Organized in a progressive structure Servers come in numerous structures: essential, auxiliary, storing, sending To design DNS, set up a forward and converse zone Use ping, nslookup, and burrow to investigate DNS

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