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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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Edgemax Router Vlans not being picked up by ProSafe Switches

I have 4 - 5 vlans that have been setup in Edgemax Router, I did a firmware upgrade and now the switches don't seem to behave correctly in adopting the VLans. The only Vlan that works is General. I ...
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1answer
57 views

What is VLAN Hopping

I am starting on my journey into the world of Networking and have come across a term called VLAN hopping. The sentence I read was that if the Native VLAN on two switches connected to each other via ...
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How do I force SonicWall TZ300 X2 port to be a specific VLAN

I have a SonicWall VPN for my personal internet, however I have my jobs VPN connected to a VLAN25. I am trying to figure out how to connect another dedicated PC that is a work PC to the TZ300 on port ...
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8 views

Unable to access Mitel PBX on different VLAN after switching to Sonicwall [on hold]

On our network we have 2 VLANs 10.0.0.0 for DATA 10.0.10.0 for VOIP The vlans are configured on a HP Procurve 2610 switch. Previously we had a Draytek router and on it was a routing table for the ...
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19 views

Why is VLAN considered to be a connection-oriented technology?

Ref: Computer Networks Fifth Edition (Tanenbaum and Wetherall), Ch 5, The Network Layer, Sec 5.1 Pg. 357, Last 2 Lines. From my understanding, for a technology to be considered connection-oriented ...
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1answer
39 views

Cisco Nexus 5548 802.1x Guest-VLAN not available

I'm trying to configure a Cisco Nexus 5548 for 802.1x using MAC Authentication Bypass. I'm finding that there isn't an option to configure the guest VLAN in the event that authentication fails. ...
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1answer
22 views

HP V1910 ProCurve Voice VLAN auto mode possible with LLDP and no OUI mask?

On a ProCurve V1910 I have configured Voice VLAN as follows in network settings using the Web UI: LLDP -> Global Setup -> LLDP Enable -> Set Enable VLAN -> Modify Port -> Select ports -> Set Link ...
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3answers
120 views

What is the actual purpose for having a 1:1 ratio between VLANs and subnets?

I understand the technical difference between a subnet and a VLAN. After looking through questions related to this topic, including: VRFs, VLANs and subnets: difference VLANS vs. subnets for network ...
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3answers
473 views

A VLAN maps several subnet

I've read the post Multiple Subnets in a VLAN and am wondering about the possible conflicts when using several subnets in a VLAN. The recommended design is of course put a IP subnet in a VLAN. If I ...
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2answers
41 views

Partitioning between VLAN in a Trunk switch architecture

Supposing we have a Trunk switch architecture with multiple VLAN as shown below : A computer that belongs to the VLAN1 on the first switch (from the left) will be able to communicate with the VLAN1 ...
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1answer
71 views

Urgent: how to configure different interface using same ip subnet in asa 5506?

Scenario is in old asa firewall 5505 I have switch port access vlan command in different interface. Just like below: interface Ethernet0/0 ! interface Ethernet0/1 switchport access vlan 2 ! ...
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1answer
86 views

Users on one VLAN cannot access multicast resources [closed]

Feel like I'm getting closer to fixing my issue... This is the simplified version of the multicast... -No RPF Failure -pim sparse mode on all interfaces -multicast routing enabled I forced a group ...
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1answer
27 views

Is it possible to implement virtual network based on MAC in IP instead of MAC in UDP?

We know that flannel use MAC in UDP to create a overlay network. My question is: UDP header only provides an extra port number fields, let's suppose that one physical machine only run one flanneld ...
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1answer
49 views

Do i have to configure the VLAN on my switch if its already configured in the firewall

i have fortinet 51E firewall from the firewall GUI there is an option to configure a VLAN , my question is if i configured the VLAN in the firewall do i need to configure it again in the switch?
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1answer
28 views

I am trying to set up aDHCP server in a VLAN for practical of networking with Linux

I am a Linux user requesting advice about setting up a DHCP with a VLAN based on offices on one floor for the practical purpose. Is this good enough for implementing a VLAN structure with a DHCP ...
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1answer
123 views

When are Native VLANs used? Are there times when a Native VLAN will never be used?

This is probably a simple one, but I am very new to VLANs. I'd like to avoid using VLAN 1 as well as gain a better understanding of when native VLANs come into play when setting up a switch. On ...
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1answer
27 views

Pings are being swallowed by switch infrastructure until opposite ping is performed

Eleven layer2 managed NetGear switches. Have a strange problem in that some default OS install PCs are unpingable ( newDefaultInstall ) from host X until host X is pinged by the new machine. All ...
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0answers
29 views

Can I do Q-in-Q vlans between Dell and Cisco switch

Our Head Office is connected to our DR location between an L2 tunnel provided by our ISP. I need to establish a Q-in-Q setup between both sides to pass multiple VLANs through. Our head office has a ...
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1answer
56 views

VLAN forwarding in cisco

We have a Cisco 3750X (L3) as a core switch and 10 Cisco SG-300 (L2), each Switch is in a separate VLAN (include core switch) now I want to define VLAN forwarding rule on my core switch, so all ...
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2answers
186 views

Carrying remote VLAN via 2 routers to the local gateway

I have a serverA (192.168.15.1) from site A and VLAN is 15, however the VLAN 15 gateway is set at site B (192.168.15.254). There are two ISP routers as a metro role to connect each other by subnet ...
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1answer
58 views

Need help/advice on basic network setup involving security cameras, guest access, and VLANs

At some point, I'd like to move from a single, flat, network to having a more secure network using VLANs. I have an idea of what I would want, I just don't fully understand some details of Native ...
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1answer
67 views

Spine Leaf L3 TOR DMZ Design for Virtual Environments

I have a question regarding DMZ design in our DC. Let me give you some background. We have 1 rack 2 Spines 2 leafs L3 TOR connected to each spine ESXI hosts connected to the leafs 1 Palo ALto ...
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1answer
70 views

Help with small office setup - Cisco SG350 28 port switch

I have very limited knowledge in Cisco IOS but in a crucial state to setup up a small office network. I have bought 2 Cisco SG350 28 port Layer 3 switch, Switches should be enabled with VLAN and VTP. ...
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2answers
84 views

OpenvSwitch Spanning-tree priority for specific Vlan ID

I'm new to the SDN technology, I have 12 year's experience working with Cisco products, On Cisco devices, a user can set different STP priority Per VLAN ID Like : Switch(config)#spanning-tree VLAN ...
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1answer
256 views

Whether the Vlan10 and Vlan20 in the Center Router are two virtual router interfaces?

I have a ISP 4321 Router in my Cisco Packet Tracer. and I added a NIM-ES2-4 module in the Router, that provides four switching ports. and now, I configured two VLANs to the two switch port of them. ...
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2answers
272 views

Is Subnetting the Way to Configure this Network?

I have roughly 20 devices connected to a switch and want to divide them up by their different functions. Some devices are sensors, some are motor controllers, there's a data-logger, and a PC to ...
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1answer
41 views

Connect two VLANs on an NE1032 Lenovo L3 Switch

I just got a new Lenovo ThinkSwitch NE1032 with some 1G sfp. I have already created two VLANs called FE and BE that have the following IDs: 2,3. I have managed to assign an IP subnet to both of them, ...
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2answers
562 views

Posible to connect VLAN switch through dumb switch?

Is it possible to connect a VLAN switch into a dumb switch ? The router will know how to reach network connected by a VLAN through the dumb switch please ? No edge effect ? By example, a schema of ...
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1answer
73 views

How VLAN devices will get automatically IP from DHCP server

I have one Windows server 2012R2 which has 10.219.1.1 IP address & I also have Cisco Catalyst 2960-X Series which is layer 2, we managed to do inter VLAN routing by updating its firmware, where we ...
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1answer
42 views

Confused about switch configuration with 2 VLANs, and next hop route?

I have an Arista switch I'm trying to setup for learning. The router is a Netgate SG-3100 running pfSense 2.4.5. I have two VLANs setup: VLAN 22 - for normal browsing. Using the 10.0.22.0/24 subnet ...
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2answers
41 views

Use of VLAN allowed feature and security risk associated with not configuring it

if i have 3 vlans say, 10,20 ,30 if i don't assign vlan allowed to trunk port , what are the security risks i could face if i am using default vlan allowed range what are the benefits of VLAN ...
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2answers
105 views

Does 802.1Q protocol will remove the VLAN tag in the received place?

Does 802.1Q protocol will remove the VLAN tag in the received place? Such as the VLAN 10 trough 802.1Q protocol to pass frames. the 802.1Q will add 802.1q header(tag) and recalculate CRC/FCS like ...
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3answers
64 views

Two ports both in VLAN 1 on two separate switches down/down

For someone who recently got their CCENT, I feel kind of stumped. I have two switches, both are Cisco 3550s. I am using VLAN 1 as a management vlan and on S1, I assigned IP address 10.24.0.11/24 to ...
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1answer
33 views

Why does the HP Procurve show MAC addresses as 64bit and what do the first 16bits represent?

I'm working on an HP ProCurve 1810G running software P1.17. When I look at the MAC address table, it shows the learned MACs as 64bit addresses. Closer examination shows that the last 6 octets are the ...
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2answers
58 views

Standard access list

I have following setup Vlan10 Pc1 192.168.10.20 Vlan20 Pc2 192.168.20.20 Vlan21 Pc2 192.168.21.20 Subnet :255.255.255.0 All connected to layer 3 switch I have ...
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0answers
49 views

Network segmentation with VLAN and MAC auth: thoughts about implementation

Currently we have a medium-sized, flat network with some DHCP pools. This configuration isn't satisfying us anymore, as everyone can see everything on the network and it may leads to security issues. ...
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3answers
56 views

How does a switch differentiate VLANs internally? [closed]

In a simple topology of a single switch with two Access ports configured, for example fa0/1 on VLAN 10 and fa0/2 on VLAN 20, how does a switch know not to send broadcasts between these vlans if they ...
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2answers
50 views

Question about Configuring HP 2920

I'm trying to configure an HP 2920 to do routing between VLANs. I'm working on setting up a guest wireless network and I want to prevent clients on the guest VLAN from accessing our main VLAN. ...
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0answers
40 views

VLANs still exist on my switch as I reset it [closed]

I reset my Cisco 3750 by write erase and then del the vlan.dat file from the flash and reload it... but sh VTP status is still showing the VLAN... why are the VLANs still there after I deleted the ...
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1answer
59 views

Issue with ACL and router on a stick network

I have implemented LAN design in packet tracer with 6 VLANS using router on a stick configuration. Everything seems to work without ACL but I'm trying to implement rules where only the 02nd floor ...
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2answers
141 views

Cisco Catalyst 3850 router VLAN bridge no routing

New to Cisco stuff so bear with me (only a little L2 Procurve experience). I have a development network connected to an Aruba/HPE managed switch feeding a trunk with tagged VLAN's to an internal ...
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2answers
76 views

Inter vlan routing not working

Apologies if any details not clear as I'm not a network expert. I have a Procurve 3500yl layer-3 switch. I am trying to make two VLANs and get a PC in one VLAN to connect to the other VLAN. Below is ...
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1answer
376 views

Single DHCP server for multiple VLANs (packet tracer)

I have a layer 2 switch, PC 1 connected to port 1 and PC 2 connected to port 2. Port 1 is in VLAN 20 Port 2 is in VLAN 21 Can I use a single DHCP server without a router and give IP to both the PCs?...
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1answer
108 views

How to configure DHCP pools for 2 VLANs/subnets sharing a switch

I've set up DHCP pools on a layer 3 switch that goes out to 13 layer 2 switches. Most of which have their own subnet and VLANs, and everything works fine when that's the case. But when there are two ...
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0answers
63 views

What are the differences between network slicing and VLANs? [closed]

According to Ericsson, network slicing is defined as follows: Network slicing enables you to build multiple logical networks—network slices—on top of a common shared physical infrastructure. These ...
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1answer
166 views

NAT VLANs with same IP Subnets

I have a VMware environment in which VMs are running a simulation suite. The software used has hardcoded IP addresses, about 10-15 VMs, and we are running multiple instances of this software each in ...
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1answer
41 views

Vlaning issue Cisco 3560 Switch

I'm trying to connect a door intercom to fastethernet 0/1 and then 8 users connect to fe 0/2-fe 0/9 and give each user access to the first port (0/1) without letting them access each other. I have ...
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1answer
51 views

Managed switch uplink without “no switchport”

Say you have a L3 switch routing between VLANs 10, 20, and 30, and you need to uplink the switch to a router for the VLANs to get to the rest of the network. The VLANs don't traverse between sites. I ...
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1answer
76 views

Vlan cannot get DHCP address from using Router and L3 Switch

Simplified diagram of a larger network, but I'm having trouble getting DHCP from the router. Going into simulation mode in packet tracer, I'm seeing an error on the layer 3 switch saying "There is no ...
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1answer
38 views

Newby setting up a small business with an IP Credit card machine [closed]

I have a small network with a shared internet connection. I have a router separating my network and everything into an unmanaged switch. The credit card machine security ran a check and said we are ...