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DNS Basics and Mail Security

DNS Basics and Mail Security. IT:Network:Apps. Domain Name System Terms. Hosts Root Servers Zones Name Resolution Reverse and forward Lookups CName MX Records NSLookup IPconfig. DNS. DNS is a database with its own set of tools used to provide maintenance and querying capabilities

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DNS Basics and Mail Security

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  1. DNS Basics and Mail Security IT:Network:Apps

  2. Domain Name System Terms • Hosts • Root Servers • Zones • Name Resolution • Reverse and forward Lookups • CName • MX Records • NSLookup • IPconfig

  3. 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

  4. 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

  5. Testing DNS • NSLOOKUP • SET TYPE=ANY <ENTER> • DOMAIN.COM

  6. Configuring DNS Records for Email • Register domain name • www.networksolutions.com • www.godaddy.com • Create records

  7. Spam • http://www.spam.com/Not! • Spamis the use of electronic messaging systems (including most broadcast media, digital delivery systems) to send unsolicited bulk messages indiscriminately.**www.wikipedia.com

  8. Spam • Office 365 • Filtering built in

  9. Spam • Custom Office 365 Policies

  10. Spam • Google (postini)

  11. Spam • Custom Configurations

  12. Spam • Support offered in Exchange 2010 as well as legacy Exchange • 2003Intelligent(?) 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 –Microsoftupdaterequestscheduled

  13. SPAM • 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/

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