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Special Forums IP Networking Proxy Server Linux Networking - VLANs & Multiple IP's Post 302920316 by PCB on Wednesday 8th of October 2014 06:22:16 PM
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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Info::Layer3::Extreme(3pm)				User Contributed Perl Documentation				Info::Layer3::Extreme(3pm)

NAME
SNMP::Info::Layer3::Extreme - Perl5 Interface to Extreme Network Devices AUTHOR
Eric Miller, Bill Fenner SYNOPSIS
# Let SNMP::Info determine the correct subclass for you. my $extreme = new SNMP::Info( AutoSpecify => 1, Debug => 1, DestHost => 'myswitch', Community => 'public', Version => 1 ) or die "Can't connect to DestHost. "; my $class = $extreme->class(); print "SNMP::Info determined this device to fall under subclass : $class "; DESCRIPTION
Provides abstraction to the configuration information obtainable from an Extreme device through SNMP. For speed or debugging purposes you can call the subclass directly, but not after determining a more specific class using the method above. my $extreme = new SNMP::Info::Layer3::Extreme(...); Inherited Classes SNMP::Info::Layer3 SNMP::Info::MAU Required MIBs EXTREME-BASE-MIB EXTREME-SYSTEM-MIB EXTREME-FDB-MIB EXTREME-VLAN-MIB EXTREME-POE-MIB Inherited Classes' MIBs See classes listed above for their required MIBs. GLOBALS
These are methods that return scalar value from SNMP $extreme->model() Returns model type. Checks $extreme->id() against the EXTREME-BASE-MIB. $extreme->vendor() Returns extreme $extreme->os() Returns extreme $extreme->os_ver() Parses device operating system version from description() $extreme->serial() Returns serial number ("extremeSystemID") $extreme->temp() Returns system temperature ("extremeCurrentTemperature") $extreme->ps1_status() Returns status of power supply 1 ("extremePowerSupplyStatus.1") $extreme->ps2_status() Returns status of power supply 2 ("extremePowerSupplyStatus.2") $extreme->fan() Returns fan status ("extremeFanOperational.1") $extreme->mac() Returns base mac ("dot1dBaseBridgeAddress") Overrides Globals imported from SNMP::Info::Layer3 See documentation in "GLOBALS" in SNMP::Info::Layer3 for details. Globals imported from SNMP::Info::MAU See documentation in "GLOBALS" in SNMP::Info::MAU for details. TABLE METHODS
These are methods that return tables of information in the form of a reference to a hash. Overrides $extreme->interfaces() Returns a mapping between the Interface Table Index (iid) and the physical port name. $extreme->i_duplex() Parses mau_index and mau_link to return the duplex information for interfaces. $extreme->i_duplex_admin() Parses "mac_index","mau_autostat","mau_type_admin" in order to find the admin duplex setting for all the interfaces. Returns either (auto,full,half). $extreme->i_ignore() Returns reference to hash. Increments value of IID if port is to be ignored. Ignores VLAN meta interfaces and loopback $extreme->fw_mac() ("extremeFdbMacFdbMacAddress") $extreme->fw_port() ("extremeFdbMacFdbPortIfIndex") $extreme->fw_status() ("extremeFdbMacFdbStatus") $extreme->i_vlan() Returns a mapping between "ifIndex" and the VLAN. $extreme->i_vlan_membership() Returns reference to hash of arrays: key = "ifIndex", value = array of VLAN IDs. These are the VLANs which are members of the egress list for the port. Example: my $interfaces = $extreme->interfaces(); my $vlans = $extreme->i_vlan_membership(); foreach my $iid (sort keys %$interfaces) { my $port = $interfaces->{$iid}; my $vlan = join(',', sort(@{$vlans->{$iid}})); print "Port: $port VLAN: $vlan "; } $extreme->v_index() Returns VLAN IDs $extreme->v_name() Returns VLAN names ("extremeVlanIfDescr") $extreme->bp_index() Returns reference to hash of bridge port table entries map back to interface identifier (iid) Returns ("ifIndex") for both key and value since we're using EXTREME-FDB-MIB rather than BRIDGE-MIB. $extreme->peth_port_power() Power supplied by PoE ports, in milliwatts ("extremePethPortMeasuredPower") Table Methods imported from SNMP::Info::Layer3 See documentation in "TABLE METHODS" in SNMP::Info::Layer3 for details. Table Methods imported from SNMP::Info::MAU See documentation in "TABLE METHODS" in SNMP::Info::MAU for details. SET METHODS
These are methods that provide SNMP set functionality for overridden methods or provide a simpler interface to complex set operations. See "SETTING DATA VIA SNMP" in SNMP::Info for general information on set operations. $extreme->set_i_vlan ( vlan, ifIndex ) Changes an access (untagged) port VLAN, must be supplied with the numeric VLAN ID and port "ifIndex". This method should only be used on end station (non-trunk) ports. Example: my %if_map = reverse %{$extreme->interfaces()}; $extreme->set_i_vlan('2', $if_map{'FastEthernet0/1'}) or die "Couldn't change port VLAN. ",$extreme->error(1); $extreme->set_i_pvid ( pvid, ifIndex ) Sets port default VLAN, must be supplied with the numeric VLAN ID and port "ifIndex". This method should only be used on trunk ports. Example: my %if_map = reverse %{$extreme->interfaces()}; $extreme->set_i_pvid('2', $if_map{'FastEthernet0/1'}) or die "Couldn't change port default VLAN. ",$extreme->error(1); $extreme->set_add_i_vlan_tagged ( vlan, ifIndex ) Adds the VLAN to the enabled VLANs list of the port, must be supplied with the numeric VLAN ID and port "ifIndex". Example: my %if_map = reverse %{$extreme->interfaces()}; $extreme->set_add_i_vlan_tagged('2', $if_map{'FastEthernet0/1'}) or die "Couldn't add port to egress list. ",$extreme->error(1); $extreme->set_remove_i_vlan_tagged ( vlan, ifIndex ) Removes the VLAN from the enabled VLANs list of the port, must be supplied with the numeric VLAN ID and port "ifIndex". Example: my %if_map = reverse %{$extreme->interfaces()}; $extreme->set_remove_i_vlan_tagged('2', $if_map{'FastEthernet0/1'}) or die "Couldn't add port to egress list. ",$extreme->error(1); Data Munging Callback Subroutines $extreme->munge_power_stat() Removes 'present' and changes 'not' to 'Not' in the front of a string. $extreme->munge_true_ok() Replaces 'true' with "OK" and 'false' with "Not OK". perl v5.12.4 2011-09-28 Info::Layer3::Extreme(3pm)
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