Questions tagged [vlan]

For questions about Virtual LANs (VLANs) which are used to divide what otherwise would be a single OSI layer-2 broadcast domain into multiple, logical OSI layer-2 broadcast domains.

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3answers
47 views

setting up a VLAN and joining 2 buildings through underground cabling

I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd. So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
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1answer
32 views

Correctly Setting up DHCP for Intervlan Routing

I am currently building a network and would like my two switches connected to my router to automatically assign ip addresses through DHCP pools to my PC's and devices. I have 4 separate VLans being ...
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1answer
66 views

Switch doesn't learn MAC of a connected device

I am new to networks. What does it mean when a switch doesn't learn the MAC address of the connected device? And how can VLANs can impact that?
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1answer
37 views

Managing a Juniper EX4300 In Band

Currently, our ex4300 are managed in band using irb.20. show configuration interfaces irb unit 20 { family inet6 { address 2001:db8:1::252/64; show configuration routing-options rib inet6.0 {...
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2answers
45 views

Switch Operation Beyond VLAN Segmentation

What are the other operations performed by a switch which are outside the VLAN's boundaries. Is Logical (VLAN) Segregation is exactly same as breaking a switching network physically via a Router?
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1answer
31 views

How to combine multiple ADSL lines?

Before beginning, I'm totally new to advanced network topics and not working as a professional network engineer or so. Just trying to learn some stuff. My problem is, I have 3 different ADSL (or VDSL)...
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1answer
65 views

Losing connectivity after creating a VLAN other than the default VLAN

I have a 192.168.0.0/24 network that serves three computers. There are no issues with this part of the existing network. I have purchased a new Cisco SG350-28P 28-Port Gigabit PoE Managed Switch. I ...
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1answer
30 views

What is the difference in packet structure for tag VLAN and port VLAN

I am new to networking. I just want to know the difference in ethrenet packet structure for tag based VLAN and port based VLAN. For tag VLAN, a VLAN tag is added to the ethernet packet frame so that ...
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1answer
33 views

How to define trunk port between vmware esxi host 6.5 and switch? [closed]

I create some virtual machine in different vlan but i can not set trunk port from vmware to transfer vlan information.
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0answers
43 views

How to allow traffic through vlan

I have router connected directly to Antenna from G0/4 and when connected PC to G0/1 the internet working normally as Fig. 1 in below Photo. I need to change the router place so i create vlan 500 in ...
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2answers
64 views

VLAN based subnets, where should I untag a VLAN?

I have attempted to search this problem but I don't really know how to explain it properly (possibly a sign I've taken on more project than I can handle). Anyway I am currently working on chopping ...
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2answers
114 views

Whats the difference between VOICE VLAN and ACCESS VLAN

Can someone please tell me the difference in Layman's termsfor these 2 configurations? interface FastEthernet0/1 description PHONES switchport mode access **switchport voice vlan 51** spanning-...
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0answers
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Arp Protect in dynamic VLAN environment

I am using 802.1x authentication with dynamic Vlan assignment(CPPM). As you may know, when a user logges in to their computer, SW attaches the user port to related Vlan. Thinking the scenario in which ...
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1answer
71 views

Using L2 switches for multiple connection

For proof-of-concept, I need to build a small network but have not enough L2 switches.Is there anybody help to solve this problem? Below is the network I want to build. L3SW---L2SW1---L2SW2---RT---...
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52 views

Cannot create connection between two routers in same VLAN via switch

I currently have a Cisco 2960-24TT switch (switch1) and a Cisco 1841 router (router1) that form part of my core network connecting other VLANs and devices. The two ports on router1 have been ...
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0answers
30 views

LAG and VLAN Problems

I have an extended star network between two buildings. In each building I have a "Main" switch. The two Dell N1524 switches are connected via 4 fibre optic links over SFP+. Now the 4 links are ...
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1answer
58 views

Why is this subnet config required by my vlan “snake topology”?

I must validate the bandwidth on all 8 ports of a switch. We intend to do this with a "snake" topology as described in this article: http://thenetworksherpa.com/test-throughput-alchemy-using-a-snake-...
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2answers
150 views

Configuring a network for 100% isolation (for security)

I'm configuring a LAN for an office. It's a new setup, and therefore there are desktops but no servers and no PC-to-PC communications - everything is on the cloud. The exception to this are several ...
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1answer
38 views

Using a VLAN to Completely Isolate Devices from the Internet & Other VLANs

I have a Cisco SG350-10P Managed Switch, and currently have two VLANS on it, the default VLAN 1 and VLAN 10. I want devices connected to VLAN 10 to have no ability to communicate with the internet or ...
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1answer
48 views

Correct vlan/interface config for connection to upstream provider network

We have recently switched from HP Procurve series to HP Comware based switches. A configuration which has been working on Procurve doesn't seem to work on Comware. Here are the details: The provider ...
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1answer
29 views

Is performance worse routing between two vlans on one interface than routing between two NICs with no vlans?

I have a Linux router with one interface that is connected to a switch in port 2. Port 2 on the switch is a member of vlan2(ISP) and vlan3 (office devices). My router is currently routing between ...
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0answers
40 views

PVLANs/Port isolation in IPv6 networks

We're currently using port isolation to prevent communication between computers on the same vlan and use client isolation on our guest wifi. The reason for having this enabled is to prevent unwanted ...
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2answers
56 views

Typical LANs with VLANs

When using switches which support VLANs with switches which doesn't support VLANs, can they be mixed with each other in the same network?
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2answers
99 views

VLANs vs subnets pros and cons

What are the pros and cons of designing an entire network using VLANs rather than design the network only using subnets?
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1answer
45 views

CSMA/CD in VLANs query

Ethernet is based on CSMA/CD. When using VLANs, the number of stations can become very high, making CSMA/CD inefficient. Are there any mechanisms that VLANs use to overcome this?
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5answers
4k views

VLANs over internet

How does VLANs work over the internet and span across multiple geographical locations? VLAN headers are removed when frames move to another switch or a router? How does it happen?
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2answers
55 views

Cisco Switch without VLAN support?

I've been reading about VLAN and wondering is there any Cisco Switches that do not support VLAN? So far, all switches that I found do support VLAN. This is one of the example in my lab. Cisco-Switch-...
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1answer
70 views

ICMP message doesn't leave NIC of PC

I got an interVLAN configuration a.k.a 'Router on a Stick'. I can ping all the workstations with each other, except PC9 (refer to image). I did a simulation and found that the packet does not even ...
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4answers
149 views

Are VLANs the same on different brands of devices?

I have 3 switches from different brand and I want to configure VLAN on them Do these switches have to be from the same brand (Cisco or others)to be able to configure VLANs?
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1answer
62 views

How can I get OSPF to see the VLANS that are trunked through the gigabit port

I am relatively new to this and I have been trying various configs but nothing is catching. I have three routers, with various vlans. The vlans are working. The routers are seeing each other using ...
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1answer
67 views

Router can ping and resolve hostnames, but VLANs and switch cannot

I recently installed an Adtran Netvanta 4430 to perform some basic VLANs on a network with a little bit of inter-VLAN routing, and I'm having a few odd issues, probably attributed to my inexperience ...
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1answer
166 views

What is the purpose of native VLAN on a trunk link?

Most VLAN articles I've read recommend avoid using VLAN1 for ports with untagged traffic (aka access ports). I've heard enough of this nonsense. Except for the reserved values of 0x000 and 0xFFF, a ...
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2answers
67 views

Is there a way to manage IP space with only a switch?

Is this scheme possible? External provider = External provider of the internet Generally speaking, is there a way to assign a public IP address individually for each server to be used when SFP+ port ...
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1answer
47 views

Access a device connected in another switch

I have theses two switches, 3Com 4500 and 3Com 2928. 3Com 4500 - IP: 20.20.X.X ; Mask: 255.255.240.0 3Com 2928 - IP: 192.168.1.X; Mask: 255.255.255.0 There is a printer(20.20.2.1) connected in the ...
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6answers
3k views

packet routing between subnets on same vlan

I am trying to understand how packets are routed within the same VLAN. I understand that typically there should be a 1:1 mapping between VLANs and Subnets. However if i deploy the following ...
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3answers
45 views

Ip phone problem cannot get an ip address from dhcp using other vlans except from vlan 1

i am trying to understand native vlans. when i use vlan 1 it worked and it provides an ip address to my ip phone. When using vlan 100 it does not work even i tried using native trunking on it. please ...
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1answer
35 views

Device on VLAN is accessible from VPN but not from LAN

I have a Meraki MX84 with two VLANs, 192.168.213.0/24 (main subnet), and 10.4.213.0/24. I have an EdgeRouter 12P connected to the MX with static WAN IP 10.4.213.2. The issue is: when I VPN into the MX ...
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0answers
206 views

How to check vlan interface traffic on Cisco nexus 9k

I have Cisco N9K-C9396PX L3 switch which has VLAN interface configured for my LAN gateway and i want to monitor how much traffic vlanXXX handling, I have configured SNMP monitoring to pull interface ...
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1answer
44 views

Does Network segmentation work using different switches connecting to router?

I just learnt basic networking. If I have 2 departments which I do not want them to access each other's networks, does using two layer 2 switches connecting to the router does the job or do I need a ...
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3answers
397 views

Cisco ASA 5512X does not allow connections across VLANs to internet

First time doing a network, I'm a software guy normally. I am setting up a network to share and internet connections to multiple properties. The goal is to segment each property onto its own VLAN. I ...
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1answer
78 views

EIGRP Holding Time Expire on VLAN Interfaces

I configure 2 Layer 3 Switches with VLANs and EIGRP route. But it always return a message like this : %DUAL-5-NBRCHANGE: IP-EIGRP 2019: Neighbor 192.168.20.253 (Vlan20) is down: holding time expired ...
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2answers
90 views

Cisco Catalyst 9410 - Using Default Gateway versus ARPing for locally connected host

I may be missing something extremely simple here, but im at loss trying to figure out what this Nexus switch is doing. Here is the topology: DISCLAIMER! I had made a mistake on the diagram by ...
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1answer
59 views

Cisco 3750: SNMP

On my Cisco 3750G, i have SNMPV3 enabled, this is working perfectly with Zabbix. I would like to separate production flows from supervision flows, Do you know if it's possible to enable SNMP ...
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1answer
45 views

STP Priority field and 4 bits in multiples of 4096

For the STP Priority Field, how do you get "multiples of 4096" out of 4 bits?
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1answer
39 views

Routing between 2 VLANs with one HP Switch

I need help with VLAN: I have a WiFi AP with the IP 192.168.100.190. There are 2 SSIDs with VLAN 1 and 2 created. As a router I have a Sophos UTM with the IP 192.168.100.199. Furthermore, I have an ...
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3answers
180 views

Difference between Port (all VLANs allowed) and Trunk

I have a very basic background on networking Cisco (2960 switch), and realize that Fortiswitch 224E has the option to allow many VLANs in a port: On the other hand, is the trunk (which I assume is ...
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1answer
49 views

Connect 2 VLANs on Cisco SG300 with cable

I have a Cisco SG300 with 2 VLANs enabled, half the switch ports are on one VLAN, half is on the other. Both VLANs use the same subnet. I want traffic to travel between the 2 VLANs. I thought the 2 ...
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1answer
61 views

Can different VLANs have same subnet? [duplicate]

When talking about VLANs I often see examples like this: VLAN 10 - 10.0.10.0/24 VLAN 20 - 10.0.20.0/24 Different subnets yet different VLANs. I understand this is a must if we want communication ...
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1answer
55 views

Vlan Command Issues on Cisco Switches

I'm new to cisco equipment. I have GNS3 emulating an L3 switch whose image is "i86bi-linux-l3-adventerprisek9-15.5.2T.bin". I want to create a cable network with 802.1x and vlan authentication. For ...
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3answers
31 views

Can we set filewall rule to control with in subnet? and also if we use 2 subnet on same interface Is this effect to firewall rule?

Can we set filewall rule to control with in subnet? as in picture Can we use firewall to controll PC0 to access only some port on PC1 ? if we set gateway to router , Is it will alway go to router ...

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