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IP Networking
VLANs and their domains
Post 302910156 by gjws on Tuesday 22nd of July 2014 08:10:24 PM
07-22-2014
Like Jim says, the main purpose would be security enforcement. It is very typical for an application to make use of a web server, an application server, and a database server. The Web server is obviously open on ports 80 and 443, and accessible from the internet. Web server may talk to the application server via, say DCOM, which by default used UDP ports 1024-5000. Lastly, the application server may talk to the Database server using SQL on TCP port 1433.
Ideally these servers would all talk to each other through a firewall, which can perform L3 - L7 application filtering and enforcement. So your firewall would have a leg in all 3 VLANS, and all traffic between the servers would be forced through the firewall. With things like virtual firewalls becoming more common things are becoming more and more complex in the DC. For example, the web, application and db server may all reside on the same physical host in a virtualised environment, so then you need to start thinking about things like 802.1q trunking etc, but that's another discussion
Ideally these servers would all talk to each other through a firewall, which can perform L3 - L7 application filtering and enforcement. So your firewall would have a leg in all 3 VLANS, and all traffic between the servers would be forced through the firewall. With things like virtual firewalls becoming more common things are becoming more and more complex in the DC. For example, the web, application and db server may all reside on the same physical host in a virtualised environment, so then you need to start thinking about things like 802.1q trunking etc, but that's another discussion
Last edited by gjws; 07-22-2014 at 09:10 PM.. Reason: spelling
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LEARN ABOUT SUNOS
list-domains
asadmin-list-domains(1AS) User Commands asadmin-list-domains(1AS) NAME
asadmin-list-domains, list-domains - lists the domains in the given domains directory SYNOPSIS
list-domains [--domaindir install_dir/domains] [--terse=false] [--echo=false] list-domains lists the domains in the given domains directory. This command is supported in local mode only. OPTIONS
--domaindir directory where the domains are located. If specified, path must be accessible in the filesystem. If not specified, the domains in the default install_dir/domains directory are listed. --terse indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well- formatted data for consumption by a script. --echo setting to true will echo the command line statement on the standard output. Example 1: Using list-domains asadmin> list-domains List of domains: domain1 running samples not running Where: the domain1 and samples are listed and their status printed. EXIT STATUS
0 command executed successfully 1 error in executing the command asadmin-create-domain(1AS), asadmin-delete-domain(1AS), asadmin-start-domain(1AS), asadmin-stop-domain(1AS) J2EE 1.4 SDK March 2004 asadmin-list-domains(1AS)