IT:Network:Apps. Hosts Root Servers Zones Name Resolution Reverse and forward Lookups CName ...
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Transcript of IT:Network:Apps. Hosts Root Servers Zones Name Resolution Reverse and forward Lookups CName ...
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DNS Basics and Mail Security
IT:Network:Apps
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Domain Name System Terms Hosts Root Servers Zones Name Resolution Reverse and forward Lookups CName MX Records NSLookup IPconfig
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DNS DNS is a database with its own set of tools
used to provide maintenance and querying capabilities
Root Servers are DNS servers that maintain info about all other Domains
Topmost root domain is unnamed and is simply the “.”. Next is the Top-level, ie.◦ .com, .edu, .gov, .int, .net, .org, .mil, etc, etc
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Record Types ‘A’ Record
◦ Specifies a host address Myserver.mycompany.com IN A 127.0.0.1
CNAME◦ Canonical name define aliases for their true host name. Mapping multiple names to a single IP.
MX ◦ Mail exchange record provides information for message routing for a specified domain.
NS◦ Lists other NAME SERVERS
PTR◦ POINTER RECORD is a reverse of a host (A) resource record because it provides information for
reverse lookups SOA
◦ Start of authority SRV
◦ Services locator _MSDCS _SITES _TCP UDP
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NSLOOKUP◦ SET TYPE=ANY <ENTER>◦ DOMAIN.COM
Testing DNS
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Register domain name◦ www.networksolutions.com◦ www.godaddy.com
Create records
Configuring DNS Records for Email
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http://www.spam.com/ Not!
Spam is the use of electronic messaging systems (including most broadcast media, digital delivery systems) to send unsolicited bulk messages indiscriminately.**www.wikipedia.com
Spam
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Office 365◦ Filtering built in
Spam
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Custom Office 365 Policies
Spam
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Google (postini)
Spam
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Custom Configurations
Spam
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Support offered in Exchange 2010 as well as legacy Exchange◦ 2003Intelligent(?) Message Filtering
Exchange 2010 Content Install anti-spam agents on the Transport Hub
◦ http://technet.microsoft.com/en-us/library/bb201691.aspx
◦ .\Install-Antispamagents.ps1 Automatic update for Antispam signatures
◦ Enable-Antispamupdats –IPReputationupdatesenabled $True –Spamsignatureupdatesenabled $True –Updatemode Automatic –Microsoftupdate requestscheduled
Spam
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Security Appliances◦ http://www.spamhelp.org/appliances/
3rd Party(off-site) SPAM filtering solutions◦ Postini
http://www.google.com/postini/index.html
◦ Others http://www.spamhelp.org/services/listings/managed-
anti-spam/
SPAM