Questions tagged [vlan]

Group of hosts with a common set of requirements connected as if on the same broadcast domain despite physical location

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How can I filter traffic using a layer 3 switch?

I have a layer 3 switch which needs to route traffic to 2 different networks which don't see each other. What would be the simplest and most efficient way to do this? And is there any straight ...
gsklick's user avatar
1 vote
1 answer
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DNS setup for machine with an IP on two vlans

We have a server that needs to live on two vlans at the same time. It manages our physical security infrastructure, collecting information from cctv cameras, keyfob readers, and door sensors via one ...
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Which cloud services allow layer 2 link level connections between servers?

There are advantages when you can deploy one server A so that it serves as the IP gateway for machines B, C, and D. In a real machine room, for example, A can balance incoming customer connections by ...
Brandon Rhodes's user avatar
4 votes
3 answers
16k views

Netgear smart switch: don't understand VLAN

I'm having some difficulty getting my head around the VLAN settings in a NetGear Smart Switch (GS724TS). Can anyone help me? My understanding is: All incoming packets effectively have a VLAN number ...
Bob Sammers's user avatar
3 votes
1 answer
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Multiple Vlans per NIC on Windows 2008

How do I have multiple vlans (tagged) go over one NIC in server 2008 R2? I know it's possible in *nix and I know how to do that on the network side. But it doesn't help if the server 2008 R2 can't ...
Robert's user avatar
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3 answers
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Best way to break up a large subnet

I have ran into a 10.10.50.0/20 network that is having issues with packets dropping. They run all unmanaged switches and I imagine the huge amount of devices on one subnet is causing issues. I've ...
Jason's user avatar
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1 answer
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Where OpenBSD stores information about pseudo interfaces

On my OpenBSD machine i have several pseudo interfaces for vlan that looks like vlan3: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 lladdr 00:04:e2:c5:02:2b vlan: ...
Alexander Dzyoba's user avatar
5 votes
5 answers
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Mixing SAN iSCSI Traffic with core network traffic, Am I asking for trouble?

I am configuring a new network and had a couple questions I am finding hard to find good answers about best practices on using VLANs to separate Core network traffic and iSCSI traffic. The switches ...
Hunterprime's user avatar
2 votes
2 answers
469 views

Multiple VLAN's and User Group Confusion

Am deploying and designing a new network for our sourly damaged design. I have never designed a network from the ground up, by my self. The simple run down is this : VLAN 1 - Production at the data-...
BrandonB's user avatar
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Dell PowerConnect 6224F ACL Not Performing as Expected

What I'm trying to achieve is as follows: Allow full access to the device on 10.58.9.32 (our VoIP server), from anywhere on our network. Allow ICMP to flow in all directions to/from any device. ...
Bryan's user avatar
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2 answers
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Configure LAG group for specific ports on Dell PowerConnect 5424 switches

I have two Dell PowerConnect 5424 switches, with current firmware installed. I'm trying to configure a LAG group, which will link the two switches for a certain number of ports (8-16) on each switch. ...
barryj's user avatar
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Provider cable in switch? [closed]

Is that possible to get internet connectivity if cable will be plugged into switch port? Something like that - Provider - Switch - Router. Switch is a L2 managed unit, and router running RouterOS. ...
Lex's user avatar
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7 votes
2 answers
2k views

Linux Router Problem

I have a Linux based router with four interfaces (each with its own private subnet). When I directly connect a device directly (i.e. no switch, just a patch cable) to one interface and another device ...
Bryan's user avatar
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5 votes
2 answers
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Do I need routing protocols on a small network?

I have a small network with 10 VLANs, mostly routed via our core layer 3 switch. RIP is enabled on the core switch, but I'm in the process of adding a second router for a couple of VLANs as our core ...
Bryan's user avatar
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Linux Router with Single NIC

Suppose I have a small network, with a number of VLANs as follows: VLAN1 10.1.1.0/24 VLAN2 10.1.2.0/24 VLAN3 10.1.3.0/24 VLAN routing is taken care of by the core switch, the switch doesn't do ...
Bryan's user avatar
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Cisco 3750 native vlan VLAN1 doesn't work in a Trunked configuration

I have two devices here, a Netscreen SSG520 and a Cisco 3750. #show ver Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1) Copyright (c) 1986-2007 by ...
David Mackintosh's user avatar
3 votes
1 answer
2k views

Help me make sense:VLAN, Hyper-V, Intel VMLB

I have serious problems getting VLANS working on a Hyper-V host with an Intel network card. The hardware: A router / switch (linux software bridge) which is a Mikrotik 1100 AH, Router OS 5.1 A hyper-...
TomTom's user avatar
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5 votes
1 answer
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Procurve 2810 command line - reassigning ports to a different VLAN

A very basic question, but my googling has failed to find an answer... At present the VLAN config looks like this: vlan 1 name "DEFAULT_VLAN" untagged 1 ip address 10.200.1.134 255....
ChrisNZ's user avatar
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1 answer
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Vlans running slow

I have a 150 node network that was broken up in to 4 VLANS. 1 for servers, 1 for each wing of the building and one for phones. when I copy a large file from the server to a workstation in the server ...
Mark Browder's user avatar
0 votes
2 answers
2k views

Forward port ip on seprate vlan dd-wrt

I set up multiple isolated vlans in dd-wrt. Now I need to forward a port to an IP on vlan2. The goal here is to allow someone to use a computer on vlan2 without having access to the rest of my ...
NitroxDM's user avatar
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2 votes
1 answer
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One Domain Controller and DHCP Server for multiple VLANS

Currently I have a network separated into two vlans and all the IP addressing is done statically; we are planning to put into place a domain controller and DHCP. My questions are Does the domain ...
Alex L's user avatar
  • 125
3 votes
3 answers
682 views

What are the options for establishing a VLAN to support database sharding and replication?

Background: I'm writing a web application that will be available to the world at large on a software-as-a-service basis. As input to my choosing a database platform, I've been reading up on 'NoSQL' ...
David Pinn's user avatar
2 votes
2 answers
802 views

Splitting a subnet, and routing it on a two interface iptables firewall

I have a two interface Linux iptables firewall. Currently I have several servers behind it on a private network 192.168.0.x. The firewall currently has each IP configured locally and uses NAT to ...
Antonius Bloch's user avatar
1 vote
1 answer
229 views

VLAN and Switch Recommendation

We are in the process of installing a 20 Meg Metro-E connection and we need to be able to segment the bandwidth into 3 different VLAN's that should be completely separate for security reasons and be ...
rubendn's user avatar
  • 113
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1 answer
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Configuring a new core switch with VLANs

I have a core switch that I've purchased second hand, it's foundry switch. I have created 4 VLANs (VLAN1 to VLAN4). I have created a VLAN interface for each VLAN and assigned it an IP in that VLANs ...
james p's user avatar
1 vote
2 answers
709 views

What is preferred in VLAN environment, global spanning tree or per-vlan spanning tree?

Suppose you have a big switch with several VLANs. What is the recommend best practice with regards to spanning tree? I see you can configure global spanning tree, and there is per-VLAN spanning tree. ...
Keith's user avatar
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1 answer
238 views

VoIP and Vlan implementation

I'm implmenting VoIP on our network across 30 buildings on a University campus. Would it be best to put all the VoIP phones into a single vlan or splits them in separate vlans for each building? Am ...
Stokie Mike's user avatar
8 votes
4 answers
3k views

New network design from a noob. VLANS, IP's, hardware, etc. Any comments please

I’m currently planning a large network infrastructure for a University in Ethiopia and would like people’s comments on my planning. Please bear in mind I have never done networking before. The campus ...
Stokie Mike's user avatar
2 votes
1 answer
211 views

Is there an advantage to having my Internet Gateway on a separate VLAN?

I have inherited a network and I don’t understand why the VLAN’s are setup this way. I have 6 cisco switches with a single Internet gateway. My clients are all on the VLAN 1 with an IP of 10.60.15....
Peter S.'s user avatar
1 vote
2 answers
3k views

Cisco Catalyst 3550 Switch - VLAN ACL question

I can't seem to get Vlan ACLs to work properly. I want to be able to get to servers on the 10.100.x.x network as well as the 10.200.x.x network when I'm connected through the VPN. But, I want to ...
G Chuk's user avatar
  • 11
1 vote
1 answer
362 views

No communication on my VLAN?

I am using a Netgear FSM7328S switch and have designated ports 19-24 as being part of VLAN # 3. I designated them all as untagged because I do not want them to switch traffic to any other port on the ...
Digital ink's user avatar
0 votes
2 answers
2k views

Setup Cisco RVS4000 QOS for VOIP

Just switched from dedicated T1's with analog phone lines to cable modem with 10/2 uplink. We're having some VOIP call quality issues on the outgoing side when bandwidth is stressed and I need to ...
andyknas's user avatar
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1 vote
1 answer
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configuring vlan on Ubuntu

I have bridged eth0 and wlan0, and have given a static ip for the br0 interface. I wanted to have a vlan interface. I did modprobe 8021q and I did the following: vconfig add br0 5 ifconfig br0.5 192....
nixnotwin's user avatar
  • 1,553
0 votes
3 answers
254 views

New Cisco Catalyst switches and ISL Trunks?

newer Catalysts do not offer the ISL trunk mode anymore. Now I fear VLAN-hopping/encapsulation attacks when using VLANs for WAN-isolation. What can I do to prevent such attacks? Can I mix ISL and ...
CyberOptic's user avatar
1 vote
1 answer
4k views

Cisco ASA subinterface limit - per interface or global?

A Cisco ASA can have sub-interfaces defined on an interface, vlan tags through that physical interface which are considered by the software as a separate logical interface. This page includes ...
Shane Madden's user avatar
1 vote
2 answers
2k views

Xen domU needs to be on different network (vlan) than dom0

We have multiple VLANs setup between different sites, and are using them to connect our dev. network, 192.168.3.x, and a management network, 172.16.20.x. I have a Xen dom0 on 192.168.3.x; one of it's ...
Kendall's user avatar
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3 votes
2 answers
5k views

how to separate a network for traffic

At the moment our all computers in one big LAN, it is the intention to separate the admin and edu (it's in a school) especially for traffic and less for security. How do this best? Firewall?, VLAN?, ...
Student_CVO's user avatar
14 votes
3 answers
7k views

How can I set up VLANs in a way that won't put me at risk for VLAN hopping?

We're planning to migrate our production network from a VLAN-less configuration to a tagged VLAN (802.1q) configuration. This diagram summarizes the planned configuration: One significant detail is ...
hobodave's user avatar
  • 2,850
0 votes
1 answer
404 views

ASA 5505 can't add it to switch with VLAN

I have an ASA 5505 and a Cisco switch. I am trying to hook them up together. The ASA has an IP of 10.11.2.5. Servers on the VLAN 1102 on the switch has a default gateway of 10.11.2.1. I do a show ...
IT_Fixr's user avatar
  • 235
2 votes
3 answers
16k views

VLAN translation, or how tag an untagged VLAN through a Cisco 3560

Our 3560 has a routed interface on the native (untagged) VLAN 1 connected to one port. How would I also pass that VLAN through to another port, but tag it to appear as VLAN 20 on that other port? ...
Paul's user avatar
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0 votes
1 answer
4k views

How would I create multiple VLAN interfaces on a 802.1Q and LACP trunked network connection on Solaris?

I've got a Solaris (Nexenta) NAS box that I'm trying to create multiple VLAN subinterfaces for. Currently, I've got an LACP aggregated link set up on the 10.13.111.0/26 network to my switch (Cisco ...
growse's user avatar
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0 votes
2 answers
1k views

Under FreeBSD, can a VLAN interface have a smaller MTU than the primary interface?

I have a system with two physical interfaces, combined into a LACP aggregation group. That LACP channel has two VLANs, one untagged (the "native vlan") and one using VLAN tagging. This gives us: ...
larsks's user avatar
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13 votes
2 answers
42k views

Multiple VLANs, multiple subnets, single DHCP server?

At my job we are prepping to transition from multiple LANs connected over slow VPN connections to a single MAN connected over fiber, and I've got a few questions. First of all, we are planning on ...
EightQuarterBit's user avatar
1 vote
3 answers
2k views

Making hosts accessible between LAN subnets

I have two inerfaces on my router with tomato firmwre: br0 and vlan4. br0 is on 192.168.0.0/16 subnet and vlan4 on 10.0.1.0/24 subnet. As I don't want the different network services on br0 available ...
nixnotwin's user avatar
  • 1,553
7 votes
1 answer
4k views

Looking for a tool to plan network/vlan topologies [closed]

I'm looking for a tool (desktop or web-based) that we can use to plan our network topologies using VLAN's. Something capable of defining switches, and mapping VLAN's to the ports and allowing use to ...
Kenneth Kalmer's user avatar
0 votes
1 answer
145 views

How effective is a private lan in securing a server for intranet use?

We are building a Intranet using alfresco on Managed servers. We are considering using a private lan to separate the database on to its own server which is only accessible via the main internet facing ...
Mark's user avatar
  • 9
0 votes
1 answer
1k views

Sharing IPs between multiple interfaces in VLAN

I've got two servers with 3 interfaces between them all on the same VLAN. Server 1: 1 NIC, 1 IP block (/29) with subnet 255.255.255.248 Server 2: 2 NICs, 2 IP blocks (one /28 and the other /29) with ...
Radu's user avatar
  • 129
1 vote
1 answer
1k views

Interconnecting two locations with CISCO ASA 5505, providing VPN access as well as and public access

We have two geographically distant networks locations and are thinking about introducing a new network architecture utilizing two CISCO ASA 5505s. I'm looking for a review and confirmation whether ...
Ondrej Tucny's user avatar
0 votes
3 answers
766 views

vmware esx vlan without physical switch?

Based on what I know if you're using a vlan in a VMWare ESX vswitch connected to a physical port you should connect that port to a trunk port on a physical switch. Is this right? Can you give me a ...
hamedsh's user avatar
  • 399
1 vote
2 answers
176 views

Two companies, one internet connection

We're moving into a new building with two other tenants in the next few months and we'll be splitting the costs for a single fibre connection running 10 Mbps. The ISP will be providing a four IP's ...
DaveM's user avatar
  • 11