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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 DEBIAN

guessnet-scan

GUESSNET-SCAN(8)					      System Manager's Manual						  GUESSNET-SCAN(8)

NAME

       guessnet-scan - guess network configuration data by looking at network traffic

SYNOPSIS

       guessnet-scan [options] [ethernet_interface]

DESCRIPTION

       Guessnet-scan tries to deduce network configuration data by watching network traffic at a given Ethernet interface.

       After  scanning	network  traffic  for some time, guessnet-scan prints a configuration string suitable for inclusion in /etc/network/inter-
       faces.

       Note that guessnet-scan uses heuristics and wild guesses and that the resulting data is not guaranteed to  be  accurate.   The  program	is
       intended to be used as a first try at getting network configuration data without bothering anyone.

OPTIONS

       Options follow the usual GNU conventions,

       --debug
	      Print debugging messages.

       --help Show a brief summary of commandline options.

       --init-time=int
	      Time in seconds to wait for the interface to initialize when it is not found already up at program startup.  Default: 3 seconds.

       -t, --timeout=int
	      Time in seconds to watch for network traffic.  Default: 5 seconds.

       -v, --verbose
	      Operate verbosely.

       --version
	      Show the version number of the program.

SCANNING REQUIREMENTS

       To  correctly  identify all data of the local network, guessnet-scan needs to see traffic related to a host in the local network and to the
       local gateway, if any.

       To be able to identify the network gateway, guessnet-scan also needs to see some traffic directed to the external network: you can help the
       detection  by  generating  some	outbound IP traffic during the scan, for example by browsing a web page (without proxy) or using telnet to
       open a connection to some remote host.

       Note that if you are connected to a switch, guessnet-scan won't probably be able to work, since the switch will isolate it from the network
       traffic that the other machines are generating.

SEE ALSO

       guessnet(8), interfaces(5).

AUTHOR

       Guessnet-scan was written by Enrico Zini <enrico@debian.org>.

								  10 October 2004						  GUESSNET-SCAN(8)