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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 OSF1

niff

niff(7) 						 Miscellaneous Information Manual						   niff(7)

NAME

       niff - Network Interface Failure Finder (NIFF) introductory information.

DESCRIPTION

       The  Network  Interface Failure Finder, NIFF, is a facility for detecting and reporting possible failures in network interface cards (NICs)
       or their connections. Detection is done by monitoring device counters and attempting to	generate  traffic  to  NICs  suspected	of  having
       failed.	Reporting is done using the Event Manager subsystem (EVM).  NIFF does not drive failover operations; that is the responsibility of
       the application that subscribes to NIFF's EVM events. Appropriate courses of action may include selecting  another  network  interface  for
       communication or if it is a clustered environment, migrating an application.  See nr(7) for further information.

       At  the	heart of NIFF is the traffic monitor thread. The traffic monitor thread tracks changes in the network device's counters, and notes
       if the received packet counter remains unchanged since the previous snapshot. As long as the counter continues  to  increase,  the  traffic
       monitor thread assumes the NIC is functioning. See nifftmt(7) for further information.

       The  traffic  monitor  thread can monitor any network interface.  The configuration utility, niffconfig, is used to activate and administer
       the traffic monitor thread. See nifftmt(7) and niffconfig(8) for further information.

       The Network Interface Failure Finder daemon, niffd, is a traffic generator for network interfaces that have been classified inactive by the
       kernel traffic monitor thread. The purpose of niffd is to get the interface packet counters to increment, signifying the interface is still
       alive and well. See niffd(8) for further information.

SEE ALSO
:
       nifftmt(7), nr(7), niffconfig(8), niffd(8) delim off

																	   niff(7)