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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How can i add this Virtual machine to vlan? i need hep with configuration please [closed]

This is the first time I got a ticket that needs me to add this (RTIWS19MAGLELM000) Virtual machine into VLAN 119, I really need help with this and the steps how to do it, I attached the information ...
1 vote
2 answers
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Is it okay to not assign an IP address to the physical interface of router when used for "Router on a Stick"?

When setting up "Router on a Stick" interVLAN routing, the steps I have seen only covered creating sub-interfaces for each VLAN and assigning an IP address to each of these sub-interfaces. ...
1 vote
2 answers
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Why do 802.1Q trunk ports drop tagged frames with the same ID as the native VLAN?

I'm taking a course on the CCNA and when learning about VLAN tagging, I came across this: "If an 802.1Q trunk port receives a tagged frame with the VLAN ID that is the same as the native VLAN, it ...
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2 answers
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Adding switch to domain, do I need to use vlan

I have a windows 2016 server. I am setting up a domain on it (office.local), and user accounts through Active Directory. Do I need a managed switch and vlan to allow PCs to connect to the server, or ...
2 votes
1 answer
84 views

How do you drop (or ignore or filter) all untagged traffic on an 802.1q trunk port?

This answer says "[a] trunk has optionally one untagged VLAN and many tagged VLANS." I always thought specifying switchport mode trunk would drop untagged frames at that port, but that ...
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3 answers
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What does `switchport trunk native <n>` do when in `switchport mode trunk`?

According to this article Cisco recommends VLAN 99 for the "native VLAN". But what is the point when operating under switchport mode trunk? Doesn't switchport mode trunk filter all tagged ...
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1 answer
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Is it possible to have inter-VLAN communication when at one of the VLAN's NAT gateway is not set?

Currently I am testing a network and it almost does everything that I want it to do. Just one final step is missing and I am wondering if it is even possible in the current setup. I am using a router-...
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1 answer
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PFSense: Opt port able to get to my LAN port / internet

I am trying to setup a disruption between 2 networks one that is coming from the LAN port and one with a different SUBNET from the other (OPT) port. My LAN is not getting blocked from the OPT subnet ...
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1 answer
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Packet tracer help with routing between multiple company routers with vlans and wireless routers

Im still quite a novice to packet tracer (so im sorry if this has been answered) and I'm trying to ping both vlans at company1 router to both Lans at company2 router but for some reason when the ...
1 vote
1 answer
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What is the appropriate VLAN configuration for this?

We have a group of clients connects to a Arista switch with DHCP enabled. And we want to setup an additional private VLAN so that those clients can communicate to each other through pre-defined static ...
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1 answer
260 views

Vlan 20 & native vlan 20

If native VLAN 20 wants to communicate with VLAN 20 through a trunk link what happens? Will native VLAN be able to communicate with VLAN 20?
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1 answer
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Is this a workable VLAN configuration?

I have three network switches wired and configured like this: 192.168.1.12 VLAN1: PORT 1 PORT 2 (U) PORT 3 (U) PORT 4 (U) PORT 5 PORT 6 PORT 7 PORT 8 (T) VLAN3: ...
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-1 votes
2 answers
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Made a VLAN on the switch. How to distribute the Internet to it? Is a bridge necessary or how is it done? (CLI interface)

Is a bridge necessary or how is it done? I work through the CLI interface. There is VLAN "X" (with internet). You need to give the Internet to the newly created VLAN "Y". Layer 3 ...
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1 answer
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Routing VLANs to Firewall Ports

My network has 3 VLANs: 10, 11, 12, and their address spaces are 10.0.X.0/24 where X is the VLAN ID. Their default gateway is a virtualized pfSense (even though it's virtual, I will use terminology as ...
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1 answer
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VLAN and firewall interconnection

I'm encountering some difficulties to connect some VLANs to a physical firewall. In details I have a core network with a L3 switch as a router and some L2 switches as access network. The network is ...
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1 answer
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Dell OS10 equivalent of Cisco switchport access

hoping someone knows OS10 command structure :) In the Cisco world, if I want to create an access port and add it to VLAN 50 its simply: switchport mode access switchport access vlan 50 What would the ...
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1 answer
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VLAN trunking - how to ping PC4 from PC1?

I'm still a beginner with VLANs and trunking, and I'm trying to get this topology working. Specifically, I am unable to ping PC4 (10.0.10.11/32) from PC1 (10.0.10.10/32), despite both of them being on ...
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3 votes
5 answers
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Why should I use vlans instead of subnets?

I know that this might be a trivial question for the more experienced. However, I am a student who has just started designing networks. Assuming you have to design a network of a school divided into ...
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1 answer
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How to create a subnet or secondary network? Do I need VLANs?

I am not new to IT, but in the past, I've always had a Network Admin to handle this type of stuff. That being said I know just enough to be dangerous. What I have is an old hodgepodge of different ...
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2 answers
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How to configure a layer-3 switch for routing between VLANs?

I have set up the router as a dhcp server and I would like to use the layer 3 switch to route each PC in seperate vlans. How do I configure the router and L3 switch for inter vlan routing ? the router ...
3 votes
1 answer
139 views

VLAN Ingress filtering process on switch

I read and read the information and somehow it is inconsistent or incomplete. The specification of 802.1Q also read, but to me as a person who has not previously read the specification is difficult. I ...
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2 answers
55 views

How to redirect traffic when one site goes down without downtime and the subnets are different?

We have a uniform high availability configuration [somewhat like 1] with the difference we have two different subnets, vlan and vsphere for two different sites, X and Y. The host in site X has ip 10....
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1 answer
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VLAN routing on the same subnet

Consider following situation: You have 10.3.0.0/16 network without any VLANs. Now You want to divide it... You want Your IT department be able to reach the entire network, but sales department only ...
0 votes
1 answer
72 views

Managed Switch, Setting up VLAN Tagged, Untagged, allowed & tagged only etc

Looking for some help setting up a Dell PowerConnect 2724. 1st time setting one of these up. The best graphic I could find to explain my setup: My router DHCP is enabled so it will provide IP ...
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4 votes
1 answer
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How Can a VPC ping the Router through an Etherswitch that behaves in one port as router and in the other as switch

In the following topology my main purpose is to: 1)PC11 ping Router(R) 2)PC11 ping PC13 ESW10: In gig0/3 has the no switchport command and a given IP address. In gig0/2 it has the switchport access ...
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Questions about how does the native VLAN work [duplicate]

I am studying about VLANs at the moment and I have a few questions regarding native VLANs and their purpose. I've read that they are used to carry untagged traffic, and that the native VLAN is ...
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1 vote
1 answer
178 views

Cisco ISR 4000 series with SM-X Layer 2/3 module

I have a Cisco SM-X-16G4M2X Layer 2/3 Service Module installed in an ISR 4000 series router, and I would like to configure its ports as level 2 in a vlan, and then configure that vlan with an IP ...
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2 answers
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Question about subinterface DHCP relay CISCO

I want to make 4 PC got DHCP IP address No problem with left side, but right side 2 PC can't get IP automaitic. I think the problem is DHCP Relay. How can I use ip helper-address for subinterface of ...
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1 answer
91 views

BACnet broadcasts with 2 subnets on one VLAN

I have a building automation network configuration with mechanical equipment on subnet 10.233.138.0/24 and electrical equipment on subnet 10.233.136.0/23. BACnet uses broadcasts for certain functions ...
0 votes
1 answer
91 views

HP FlexFabric 5700 (Comware) VLAN 1-to-1 Mapping. ISP assigned vlan I already use

I have a new feed from an ISP, that would be slow to respond to any change requests. They tagged this drop with a vlan ID of 10, which I happen to already be using on my switches. I want a brand new ...
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2 answers
86 views

Routing for same subnets in remote sites

Is it possible to have interVLAN routing with router on a stick topology, but with remote sites communicating via OSPF? In the diagram below, I can ping PC1 from PC0. What I want is to ping PC2 and ...
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1 vote
1 answer
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Trunk seems to be allowing all vlans

Got a catalyst 2690 on a small office net consisiting of 2 vlans, 10 and 20, 10 for the lan and corporate wifi and 20 fot guests wifi. All lan ports are config on access mode vlan 10 The access point ...
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3 votes
1 answer
56 views

QinQ tunneling more than one VLAN as a provider + is it possible to send QinQ tunneling on the same port where L2 tagged works

I have done some QinQ's tunneling in my history but always there was only one customer, so situation was clear for me how to configure it. I mean access dot1q port to the customer and the rest are ...
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0 votes
0 answers
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How to set the default VLAN on Cisco SG350 switches firmware 2.5.0.83

We've got a site with all its Cisco SG300 network switches configured with a custom default VLAN. Normally, we'd use the following commands to change the default VLAN: vlan database default-vlan vlan ...
1 vote
0 answers
36 views

asa vlan subinterface over s2s ipsec tunnel to IOS router

I am trying to configure wireless traffic that is a separate vlan subinterface on an ASA to travel over a site-to-site vpn to an IOS router. i have the static NAT set up to go from the (wifimain,...
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2 votes
1 answer
145 views

Why does 802.1ad exist?

Main Question: I'm wondering why the IEEE standard 802.1ad, which specifies the TPID of a S-VLAN as 0x88a8, for double tagged vlans exists, when it's also possible to just use two 802.1Q tags with the ...
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1 answer
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Tagged-only VLANs

I have an HP ProCurve swicth configured as follows (simplified, with U for Untagged and T for Tagged): VLAN_1: U 1,3,5,7-10,12-16 T 2,4,6 No U 11 VLAN_2: T 1,3,5 VLAN_3: T 1,3,5 What is the purpose ...
1 vote
2 answers
80 views

Best way to configure layer 2 daisy chain with 2 layer 3 switches/gateways at either end?

I would like to implement a linear daisy chain for the purpose of transmitting internet over a considerable distance. One motivation behind the use of a linear daisy chain for this problem is that ...
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0 votes
2 answers
138 views

Sharing one VLAN with two routers each one will route different subnet

We are transitioning to new WAN connectivity. I have one VLAN (let's say ID 10). Currently there is one router R1 that has one private subnet and one public subnet on the VLAN 10 which goes through ...
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2 votes
0 answers
30 views

Cisco C9300 Drop Out And VLAN Table Loss

I have a Cisco C9300 is one of my main racks. Recently it has been restarting on it's own. My suspicion that the PSU is on the way out. Strange part is when it does this the VLAN table resets to ...
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1 answer
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My PC won't ping my router

I'm trying to get my PC to ping the router. The configuration on Fa0 of my router is interface FastEthernet0 switchport access vlan 100 switchport mode trunk and vlan 100 is interface Vlan100 ...
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0 votes
1 answer
47 views

Gateway with multiple VLAN IPs on one NIC [closed]

I would like to separate several hosts from the local network and put them behind a firewall. I would like to use VLANs to "physically" separate them instead of using just different subnets. ...
0 votes
1 answer
222 views

Nexus Management VRF on same VLAN as LAN switches

1 Hi All. I searched this question but I'm not finding anything relevant, or I'm not understanding the results properly. I have all my L2 switches remote management access, SSH/SFTP, configured on a ...
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0 answers
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Cisco 2960 and Cisco 871 - no connectivity on non-default vlans

Unable to get internet connectivity from non-default vlans. Suspect router config is not adequate Five vlans created on 2960 (10,20,30,40,50)and Gig port 0/1 set to trunk. Port f0 on router which is ...
0 votes
1 answer
110 views

Configuration of DHCP for multiple vlans

I have the following network on Packet Tracer. The hosts are in different vlans each one. My goal is that the DHCP server can give IP to the hosts. Here is what I made for each vlan (the example is ...
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2 votes
1 answer
162 views

QinQ on EX4200 with arbitrary C-VLAN

Trying to setup an ethernet link from CE located in building A to CE in building B. Customer may or may not tag it's frames sent over the link. Here's the setup I am trying to use +----+ +-------...
0 votes
1 answer
457 views

How to configure NAT in Cisco ASA Firewall for all VLANs connected to layer 3 switch? [closed]

Topology: How to set up NAT in Cisco ASA Firewall (in Packet Tracer), when there are VLANs in the network? In the current approach, NAT is not working to reach the server (8.8.8.8) from any of the ...
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0 votes
2 answers
77 views

PowerConnect 5500 Series VLAN routing problem

My issue is very similar to this link: Dell PowerConnect 5524 VLAN routing I have several VLANs But most importantly VLAN 1 is the flat 192.168.69.0/24 VLAN 10 is 192.168.0.0/16 VLAN 110 is 10.1.10.0/...
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0 votes
1 answer
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Passing Modbus TCP/IP nodes (connected in multiple VLANS, same network) via Toffino firewall

I have been assigned to check the security aspect of the below network shown in image. When i asked question on security of individual modbus device, I was told to create individual vlans for each ...
2 votes
2 answers
118 views

VLAN enumeration best practice [closed]

I was looking into VLANs recently and noticed that in several tutorials, VLAN tags with large numeric gaps were chosen, like 10, 20, 30, etc. Is there a reason why one wouldn't simply enumerate it ...
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