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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.

2
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1answer
47 views

Same Vlan Name / ID on different switches network subnet same or different?

I have several switches (some on same floor and another on other floors) all connected to core layer 3 switches through trunk links. One of the vlan id / name is repeated along the switches. May I ...
0
votes
0answers
34 views

NAT setup for two LANs on same router

We have a moxa edr 810 series router , we have few devices connected to the router as below. We are using IPsec tunnel for VPN. From VPN we are able to connect Device 2 , but not able to connect to ...
4
votes
3answers
111 views

Do I need to add something to support inter-VLAN communication?

In my network using Cisco router/SW C1111-8p, the native VLAN 1 is not connected and doesn't have IP. VLAN10 192.168.10.1/24 with vlan10 DHCP pool VLAN20 192.168.20.1/24 with vlan20 DHCP pool Both ...
1
vote
2answers
44 views

What happens when DHCP client and server are on different VLANs [closed]

I'm trying to create a lab on PT and I've attached an image. But for some reason my PC is not able to get an IP address from the DHCP server. There is no issues with layer 1 and layer 2. I checked ...
2
votes
1answer
21 views

Capture filter for vlan tagged packets and non vlan tagged packets of specific ethertype

I am trying to capture traffic of ethertype 0x88b8. Some of them may be vlan tagged and some of them might not be, but the and and or operators are not behaving in the way I expect. My first attempt ...
1
vote
1answer
20 views

Permit only WEB server in ACL on router? [closed]

In that topology I need to configure 192.168.1.0/24 will block 10.10.20.20 host 192.168.2.0/24 will block 10.10.10.0/24 network All users can view web page but can't ping etc ... I done that top 2 ...
0
votes
4answers
123 views

Why do Vlans need routers to communicate?

Why do devices on two separate VLANs (Virtual LANs) implemented on the same switch require a router to communicate?
0
votes
2answers
51 views

Cisco Catalyst pseudo interface?

I think I remember reading somewhere that you could have multiple VLANs assigned to a single interface by way of a pseudo interface. Googling with that vocabulary doesn't return proper results though, ...
0
votes
0answers
19 views

Virtual Local Area Network [duplicate]

Why do Devices on two separate Virtual Local Area Network implemented on the same switch needs router to communicate.
3
votes
2answers
37 views

HP switch “No untagged port”

A network engineer showed me the show vlan output of an HP switch. I know tagged ports are trunk and untagged ports are access in Cisco terms. But can anyone explain the "no untagged port"? How is ...
22
votes
8answers
4k views

Why can't devices on different VLANs, but on the same subnet, communicate?

I have a question about switching. I have two devices connected to a switch with IP addresses 192.168.5.20 and 192.168.5.10. Both devices have the same prefix, /24. That means they are on the same ...
3
votes
3answers
432 views

Do VLANs within a subnet need to have their own subnet for router on a stick?

I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to ...
0
votes
3answers
71 views

Switch syntax, vlanXX and vlan [space] XX

How does a switch OS know that this is the same syntax? There are certain commands where you might reference the vlan like so "switchport access vlan 35", (a space between vlan and the number) and ...
0
votes
1answer
67 views

On a 3560E Switch

** Attempting to view IP address of a Non-Cisco device connected to the switchport. Already entered show mac address-table int gi0/35. Got the mac, then tried the sho ip arp vlan 120 | include ...
0
votes
1answer
40 views

Configuring HP Smart Switch and SonicWall with VLAN

I'm trying to configure an HP SmartSwitch with a Dell SonicWall on a VLAN for some computers in our network. The computers in question are on port 37 on the switch. I've created a new VLAN interface ...
0
votes
0answers
12 views

Subnetting help [duplicate]

I am sorry if this is a simple question, but I am a little overwhelmed and I can't seem to grasp what I need to do. Long story short, I took over a network that was poorly designed in my opinion, but ...
0
votes
1answer
31 views

What's the difference between dot1dTpFdbPort and dot1qTpFdbPort, and what are the octets before the last 6 (

So ... I kinda struggle to understand the difference between dot1dTpFdbPort Either the value '0', or the port number of the port on which a frame having a source address equal to the value of the ...
4
votes
2answers
123 views

VLAN Interface is down, protocol is down

I have Cisco Layer 3 switch with IP routing enabled on it. I have different VLANs configured on it and its working perfectly. Now i have added another VLAN (SVI) and assigned that VLAN to one of the ...
1
vote
1answer
71 views

Switch Configuration for Connecting LAN and WAN

Totally new on networking and on switches, so excuse me if I use some wrong terminology. Problem I have 1 computer and 7 instruments. I would like to form a network setup fulfilling the following ...
5
votes
1answer
372 views

Assigning a single switchport to different VLANs

I've been trying to figure out how to achieve the outcome below. VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- ...
0
votes
0answers
18 views

DTP On Trunk Ports [duplicate]

When Statically Configuring a Port As Access, DTP Will Be Automatically Disabled. So Why Is It When Statically Configuring a Port As Trunk, DTP Will Still Be Enabled?
0
votes
1answer
41 views

VLAN setup for three Servers [closed]

As per below, i have setup a VLAN for three servers. Do you know if this is correct?
2
votes
1answer
38 views

Can I route a VLAN on a Sonicwall to use a different gateway?

Here is my scenario. I have a Sonicwall with LAN 192.168.16.x with a VLAN(VOIP)of 10.10.20.X The PBX has a 192.168.16.X IP The ISP just installed a ESBC on the network and I gave it a 192.168.16.x IP....
4
votes
2answers
51 views

Control traffic between two switches

Two catalyst switches connected to each other and all ports of both are in VLAN 2. Ports that connect both switches are access ports (no Trunk) as both switches' ports are in VLAN 2, no any other VLAN....
1
vote
2answers
65 views

802.1X Auth for Clients and Servers

I'm about to introduce 802.1X Authentication to my current network for wifi and wired connections: My Setup: I have a Windows Domain Controller and I wanted to use the Network Policy Service for ...
5
votes
1answer
607 views

MAC Address learning process

Does a switch learns hosts mac address in these following scenarios: Switch port configured as access and frames received tagged on different VLAN Switch port configured as trunk and frames received ...
2
votes
1answer
82 views

Understanding Vlans

I've started reading about VLans, do vlans always know what port to forward messages to or are the like switches and sometimes they don't know the mac address so they just flood it to all ports? Or ...
2
votes
2answers
74 views

InterVLAN routing issue

I've got one L3 Quanta switch. Having a bit of trouble in understanding the right way to configure VLANs and inter-VLAN routing on it. Routing on the switch is enabled. Ports 0/3 - 0/40 are ...
2
votes
1answer
29 views

Subinterface on Cisco ASA 5550 does not work with VLAN on HP ProCurve

I created subinterface on Cisco ASA 5550 (ver. 9.7.1): interface GigabitEthernet1/2.810 vlan 810 nameif dmz810 security-level 50 ip address 172.29.12.33 255.255.255.248 And VLAN 810 on HP ...
1
vote
1answer
114 views

Successful Intervlan Routing on a Layer 3 Switch, Unsuccessful IP Routing

Hello and thank you in advance for your help! I'm using Packet Tracer for testing purposes and I' m trying to implement a simple intervlan routing in a Layer 3 Switch (3560-24PS) and an IP Routing. ...
1
vote
1answer
41 views

Dhcp Broadcast Through Switches

Think of a pc connected to switch1. Sw1 is connected to sw2(trunk port on both switches) and sw2 is connected to a router(dhcp server). Pc sends a dhcp broadcast. Does sw1 passes the broadcast through ...
1
vote
1answer
39 views

DHCP Broadcast on SVI

Think of a dhcp broadcast going through multiple switches. What happens to that broadcast when it reaches the vlan interface (svi)?
0
votes
1answer
123 views

Create a dead end vLAN for untagged/native between Aruba and Cisco switches

I would like to use a dead vLAN as the native/untagged vLAN on trunk feeds as a security best practice. The trunk feed is between a Cisco and Aruba switch. On Cisco switch, the vLAN is left out of the ...
3
votes
1answer
52 views

VLAN VoIP and LAN configuration over multiple switches

Some background: I currently have: Switch A Main 48 port 1Gbps (DLink) Switch B 10Gbps Backbackbone (DLink) Switch C 24 port 1Gbps (DLink) Telephone Switch 1-24 port phone switch connected to a ...
2
votes
2answers
113 views

Mgmt Vlan vs other SVI s

Think of a layer 3 switch. Assume that we have a management vlan and a mgmt vlan interface. And we have other svi's on the switch. The question is this. I know that mgmt vlan is for telnet/ssh, simply ...
2
votes
1answer
63 views

How to connect a switch with a router via another switch?

ROUTER CONFIG Router#sh run Building configuration... Current configuration : 769 bytes ! version 12.4 no service timestamps log datetime msec no service timestamps debug datetime msec no service ...
0
votes
2answers
61 views

Switch virtual interface

Single SVI can be mapped to a VLAN. When configuring VLAN on SVI, are there any fix no of subnets can be assigned to a single VLAN? maximum number of VLANs can be configured on the switch =4094 ...
4
votes
1answer
125 views

What are reasons to configure a Voice VLAN using the Auxillary VLAN feature instead of a Trunk + Native vLAN

Imagine this topology: [PC] ------- [VOIP Phone] ------- [eth0/0 on a Switch] And this configuration on the switch: vlan 22 name DATA vlan 33 name VOICE There are two ways to have both the PC'...
0
votes
0answers
14 views

How to connect private networks? [duplicate]

I need to connect two private networks. I have the same IPv4 addresses and need to establish connection between them. • How can I connect them? (NAT?) • What type of routing to use? (I know static ...
0
votes
1answer
134 views

Computer cannot ping to another computer on a different network

So my problem starts with a PC that has IP address 192.168.7.1 that cannot ping a PC with IP address 192.168.6.1. Both get their IP addresses from a Cisco router via DHCP. The router has IP address ...
2
votes
2answers
57 views

Bridge 2 VLANs using layer 2 device

This is a screenshot from a Cisco book. It says that 2 VLANs can be bridged using some L2 device also. As far as I know it is possible only by using some L3 device. Can someone please explain it how 2 ...
-1
votes
1answer
254 views

missing Packet tracer physical Tab

hello I am using packet tracer for a while.I use in my college computer. but recently I installed in my pc. when ever I try to add extra ports in my rouer or switch the physical tab is missing
5
votes
1answer
102 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 ...
3
votes
1answer
79 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. ...
0
votes
1answer
117 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 ...
3
votes
3answers
177 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 ...
3
votes
3answers
537 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 ...
1
vote
2answers
47 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 ...
1
vote
1answer
206 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 ! ...
1
vote
1answer
109 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 ...