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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ARPs passing through VLANs [closed]

I am using a switch chip (KSZ9897) with DSA linux driver. I have configured a bridge with vlan_filtering enabled: ip link set dev br0 type bridge vlan_filtering 1 Each interface on the bridge is on ...
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9 views

Restricting number of sessions between VLANs [closed]

Let’s say I have two VLANs, vlan10 and vlan20. On vlan10 I have a server accepting TCP connections on port 1000 and on vlan20 I have many client devices. Let us also say that the server cannot ...
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1answer
26 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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27 views

Datacenter network addressing with VLANs and subnets? [closed]

[Edited to scope down the question]I am trying to understand how enterprises deploy their datacenter networks using vlans and subnets. I am pretty confused with concepts so the question might be hard ...
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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
39 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
31 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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51 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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46 views

Will VLAN agnostic devices listen to VLAN tagged packets?

I have a network that looks kind of like this: We have a shared physical network between guest and operations that I keep segregated by VLANs. My knee jerk was to keep all "operations" devices on ...
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1answer
34 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
208 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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46 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
82 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
51 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
26 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
36 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
71 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
24 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
48 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
47 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
28 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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1answer
26 views

BNT Layer2/3 Switch & Cisco SG200 VLAN

I'm trying to set up a VLAN for my staging environment, but I'm having trouble. Here's my network layout: +--------------------+ | [1] [2] [3] [4] | Ubiquiti USG-PRO-4 +--|----|----|-------+ |...
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1answer
55 views

Remove VLAN tag from incoming traffic (Ubiquiti Edgerouter)

On eth4 I have incoming traffic from the WiFi AP. Some is tagged with VID 102 and some with VID 950. I want the Ubiquiti Edgerouter (which is currently acting as a managed switch) to take the 950 VLAN ...
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1answer
56 views

VLAN routing over multiple routers(RIPv2)

I am currently working on a scenario to get a better understanding of the RIPv2 routing protocol but am currently stuck. Please see my picture below to get a better understanding of what I am trying ...
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0answers
72 views

Cisco switch SVI MAC address strange problem [closed]

I am having the SVI MAC address problem on my switch (3850) The MAC address of the SVI (VLAN2) is currently conflicting with another switch. Why did this switch decide to use 7018.xxx.xxx MAC ...
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1answer
42 views

Setting all switchports as tagged for 200 x VLANs?

question: should I expect any performance hit from enabling 210x tagged VLANs on ALL 24x ports of a switch (or alternatively setting ALL 24x ports as trunk ports) background / equipment: We have a ...
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1answer
54 views

How do VLANs Work? Some Basic Questions:

I've recently started looking into VLANs. I am a network novice so bear with me please:). I have a few questions regarding VLANs. I understand that certain managed switches allow you to create VLANs. ...
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3answers
95 views

What's the advantage of having VLANs if you enable inter-vlan routing?

If you configure VLANs with each having their own subnets, is there a point to have them if inter-vlan routing is enabled? Since VLANs will have access to other VLANs, the security argument is not ...
2
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1answer
63 views

Upgrading Cisco 819 to 809, can I connect devices to 2 routed ports and be on same subnet?

The company I work for has multiple remote "IoT" style sites connected back to the datacenter via a Cisco 819 cellular router. We are in the process of upgrading these to the newer Cisco IR809 routers ...
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1answer
42 views

802.1ad (QinQ) and router

I am a little bit confused. Is router aware of VLAN tag? What happen when tagged frame comes to router? (without any extra setting like encapsulation) Or what happen when QinQ frame comes to router? ...
2
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1answer
80 views

Restructuring office network advice and How to go about VLAN setup?

Wanted to get some advice and assurance that I’m on the right track for re-configuring our office network. Current setup: FortiGate100D with 2 physical network interfaces, network-1 used for regular ...
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0answers
26 views

HPE 3800 stack routing fails if a certain member is off line

We have a pair of stacked 3800's connected to a pair of stacked 2920's.  We have inter vlan routing enabled with a different subnet on the 2920's.  This has been up an running for about 3 years ...
2
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1answer
158 views

Access control on Cisco router with switchports?

I am working with a series 800 router which has inbuilt switchports. I want to use 2 switchports for a VLAN (say VLAN 100). On one port will have devices: 192.168.1.10 192.168.1.30 Connected to ...
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3answers
316 views

Leaf-Spine network without routing

If I have a leaf-spine network with all the servers on the same subnet, say 10.10.0.0/16, do I need a router (or l3) since everything is on the same network and the network is flat?
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1answer
37 views

Setup VLAN within fiber SFP switch with a ROUTER

Good day, I am simulating a setup as below: The configurations as below: 3 switches are joined with fibre optics in TRUNK mode. PC0 joined to gigabit port of switch in VLAN 20 (192.168.2.55/24), ...
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1answer
46 views

Connecting DELL N1548 to HP Core switch with LAN

I currently have a setup with a HP core switch with few VLANs configured on it e.g. vlan 10, 20, 30, 40. However when I uplink my DELL N1548 to the HP core switch, I cannot connect anything behind ...
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1answer
36 views

Static IP assignment 3750X - DHCP Override

I have a 3750X that I am running some testing with. I have a VLAN interface that is using 10.10.10.254/21 as it's primary IP and 192.168.10.254/24 as it's secondary IP. See below: interface Vlan10 ...
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1answer
88 views

Will this network diagram cause broadcast storms?

I have three VLANs, and I want to communicate between them, but all packets are dropped. I made a trunk to allow all VLANs. Should I use STP to control broadcast storms?
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1answer
96 views

Help with VLANs on Meraki MX

I have a Meraki MX84 in Routed mode with a Default 10.10.0.0/24 subnet and then VLAN 10.10.3.0/24 ID 3, VLAN 10.10.4.0/24 ID 4, VLAN 10.10.5.0/24 ID 5, and 10.10.8.0/24 with ID 8. All ports on it are ...
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2answers
60 views

Can't get to the Internet from VLAN on switch

I'm trying to setup a network lab to learn more about networking. Equipment: 2 procurve switches. 1 Sonicwall firewall TZ300 The final outline: traffic from Vlan 10 on switch 1(port1) goes to ...
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1answer
50 views

Cisco SMB Switch Configuration for VOICE VLAN and DATA

I am hoping to get some assistance with a current issue I am facing at the moment... I have 3 Cisco SMB Switches, (2) SG300 Managed Switches and (1) Unmanaged Switch. SWSG1 | 172.16.1.100 | Port 24 ...
2
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1answer
173 views

How are packets handled and prioritized over a link with multiple VLANS?

So, the question is this. I have a Cisco router with multiple VLANS assigned to a single Gigabit port. 100,200,300, etc. as well as the normal connection without any vlan tagging. Now, everything ...
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0answers
16 views

WatchGuard interface with secondary router holding WiFi splash page

I have a captive portal splash page I need to be presented to only 1 Open Wireless SSID on a WatchGuard AP controlled via the XTM330. The WatchGuard is not able to present the required splash page ...
3
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1answer
116 views

Switching interface VLAN ID Mid-Production

I was wondering if there was a way to switch out the VLAN ID from VLAN1 to VLAN10 without impacting the connectivity of the end users? Can I simply copy and paste from one interface VLAN to another? ...
0
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1answer
101 views

JUNIPER EX-2200-C Layer 3 Switch Configuration

I am setting up attempting to simulate a small infrastructure of Clients and Servers. Current Setup 1x. Dell Inspiron Tower Running ESXI 6.5 1x. HP Z800 Workstation Running ESXI 6.5 1x. Juniper ...
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1answer
34 views

Why does this setup fail sometimes with Juniper EX4200?

I've got a very straight forward setup with the following devices: 1 x 10G Fibre uplink (internet) 1 x ASUS AC68U wifi router 1 x EX4200 20 x Servers (With IPMI and single ethernet) The EX4200 is ...
0
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1answer
45 views

Why Access ports should have the same trunk native vlan? [closed]

In the current switch Management VLAN is 48. Can you please someone explain it to me, why we dont give trunk native VLAN as 48, and we configure the same as access VLAN? Thanks in advance.
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2answers
54 views

Private Vlans - Promiscuous port [closed]

If I had a private vlan on my switch, can it communicate with a 'normal' vlan on that same switch ? Is it only between secondary private vlan that communication is restricted ? It seems to be the ...
3
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1answer
128 views

Port Channel Hybrid Port Issue

I have a Dell Sonicwall NSA 4600 running the latest firmware with an Interface that's configured to have a secondary redundant port. This interface also has a VLAN sub interface assigned to it. On ...
4
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3answers
169 views

JunOS, access mode interface asks for a vlan

I'm kinda new to networking so I'm going to do my best to try explain my issue. The issue that I have is that I want to delete all default configuration for my xe interface. Current configuration: ...