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Linux Networking - VLANs & Multiple IP's

 
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Old 10-08-2014
Linux Networking - VLANs & Multiple IP's
In a "typical" data centre environment (telco, financial services etc), would a Linux OS typically have one IP address connected to one VLAN or would it have many IPs and/or VLANs. I say "Linux OS" as I'm referring to an instance of the OS not necessarily a Host or server. Think Linux OS = VM in a virtualisation context. Its common for a server/host to have many IP's and possibly in different VLANs but would an OS (VM) within that host typically just have one IP in one VLAN?

I'm asking because of an ongoing debate with a Network team that wants different IP's and VLANs per Linux OS and have us put for example ssh onto one IP, and then server traffic (e.g. HTTP) onto another IP in order to separate traffic. Is this kind of thing common in a modern data centre or not? When would one go that approach vs just putting the OS onto the VLAN thats "most representative" of its function: E.g. web proxy in DMZ VLAN, App server in Backend VLAN etc etc.
 
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LEARN ABOUT OPENSOLARIS

clprivnet

clprivnet(7)					     Sun Cluster Device and Network Interfaces					      clprivnet(7)

NAME

       clprivnet - SUNW,clprivnet Sun Cluster private network driver

SYNOPSIS

       /dev/clprivnet

DESCRIPTION

       Note -

	 Beginning  with  the Sun Cluster 3.2 release, Sun Cluster software includes an object-oriented command set. Although Sun Cluster software
	 still supports the original command set, Sun Cluster procedural documentation uses only the object-oriented command set. For more  infor-
	 mation about the object-oriented command set, see the Intro(1CL) man page.

       The  SUNW,clprivnet  Sun  Cluster  private  network driver is a STREAMS pseudo driver supporting Sun Cluster resident applications that use
       standard Solaris interfaces to communicate over the Sun Cluster private network. By striping data traffic over all links, this driver opti-
       mally utilizes the bandwidth of the private network while supporting highly available, software fault-tolerant communication.

APPLICATION PROGRAMMING INTERFACE

       The driver is supported by the character-special device /dev/clprivnet, but is reserved for Sun Cluster internal operation and the standard
       Solaris network utilities. This interface must not be directly used for general application communication.

ADMINISTRATION

       The administration and configuration of the driver as a network interface is done completely by the Sun Cluster infrastructure internals.

FILES

       /dev/clprivnet

	   clprivnet special character device

       /usr/kernel/drv/clprivnet.conf

	   System-wide default device driver properties

Sun Cluster 3.2 						    05 Sep 2007 						      clprivnet(7)