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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VLAN(7) Miscellaneous Information Manual VLAN(7)
NAME
VLAN - virtual local area network
DESCRIPTION
This manpage provides a brief overview of VLAN (virtual LAN) technology.
VLANs are logical, or network segments that can span multiple physical network segments. A primary benefit of VLANs is that they can iso-
late broadcast and multicast traffic by determining which destinations should receive that traffic, thereby making better use of switch and
end-station resources.
Logical separation using VLAN allows for the logical grouping of PCs, servers and other network resources to behave as if they were con-
nected to the same, physical segment, even if they are not.
HP-UX VLAN is an implementation of IEEE 802.1p/Q standards.
VLAN interfaces can be configured in HP-UX servers using the command (see nwmgr_vlan(1M)) or (see lanadmin_vlan(1M)). HP recommends that
you use for HP-UX Release 11i Version 3 and forward. Interfaces can also be configured using the web-based management tool HP-UX System
Management Homepage (HP SMH).
Each VLAN interface created is assigned a VLAN PPA (VPPA) that is unique across the system and a VLAN ID, that identifies the virtual LAN
it is part of. The VLAN ID is unique on the interface on which the VLAN interface is created.
WARNINGS
The and commands are deprecated. These commands will be removed in a future HP-UX release. HP recommends the use of replacement command
nwmgr(1M) to perform all network interface-related tasks.
SEE ALSO
lanadmin(1M), lanadmin_vlan(1M), lanscan(1M), nwmgr(1M), nwmgr_vlan(1M), smh(1M).
IEEE 802.1p, IEEE 802.1Q
VLAN(7)