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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 to enable communication of devices from different VLANs

In my router (DSR-1000AC with Firmware 3.11_WW), I created a new VLAN 192.168.3.x following the instructions from HOW to Setup Two VLANS ‑ DSR‑Series. I used a simple switch (not managed) and I ...
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24 views

Receive trunk to pass it to virtual switch [closed]

i'm trying to re-implement simple setup i did for Windows segment on Linux-based servers: Dell N1548 is configured have pairs of ports LAG'ed as trunks. interface Gi1/0/21 channel-group 1 mode ...
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55 views

Cisco 2960 not receiving dhcp from the router

I have a problem with Dhcp of some the Vlans. here is how my network is : I have a router ASR1001, which connects 15 switches(2960) as a ring topology. each switch has a subinterface of the router ...
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2answers
34 views

Routing specific TCP/UDP packets from VLAN's to proxy server

I need to set up a solution which is for routing specific TCP/UDP packets between the devices in two separate VLANs through a proxy server. For eg: all my computers are connected to one VLAN(1) and my ...
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3answers
1k views

How not to route on a Cisco router

So we have a router, with a switch card interface, 8 ports Say I have 4 VLANs (A,B,C,D) on it, with 2 switch ports in each. Each VLAN (i.e. all ports) can communicate with each other, because ...
2
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1answer
49 views

How to solve a BKN* Port Issue on a cisco catalyst

There is a Cisco ISR 4451 connected with Portchannel to a Catalyst 3850 Stack and there are some VLANs enabled, but only one does not come up for a Portinconsistence. I figure out an Issue on the ...
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1answer
26 views

Cisco RV325 VPN to Remote Site with Multiple VLANs

We've been running a VPN over two Cisco RV325's successfully using the following mapping: Site1: IPS="NAME=g2gips0&WEBNAME=Site2&LSUBNET=10.10.0.0&LMASK=255.255.255.0&RG_IP=71.XXX.XXX....
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0answers
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802.1Q-2014 I-Tag and MAC addresses

I am reading IEEE 802.1Q-2014 for interest. This incorporates I-Tags, which define backbone service instances. In a few places, the standard implies or states that the I-Tag includes the C-DA and C-SA....
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1answer
39 views

Vlan trunk link between cisco switch and BDCom Switch not working, but works in access mode

I have a cisco SF 300 switch which is connected to a chinese brand BDCOM switch (2500 series full gigabit port) . When both the ports of switch are configured in access mode, it works. But when they ...
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1answer
22 views

My interface do not have a IP address in a segment, but I can ping the IPs of it

You see, in my local Mac's network interface there is no 172.18.1.*: $ ifconfig lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP&...
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0answers
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How to connect to a non VLAN Router device from a Trunk VLAN on a catalyst Switch

On a Cisco Catalyst 3850 Stack there is attached a Link to a Carrier who provide a few connections seperated with vlans (100,101,...) so I create a VLAN 100 on my cisco switch and setup a IP Address ...
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3answers
48 views

Management switch as a medium only

The main goal is to guarantee communication between CE switches without any PE reconfiguration. Interface GE0/0/1, GE0/0/2, GE0/0/3, GE0/0/4 will be connected to Customer switches. Customer decide ...
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1answer
33 views

Setting up VLAN [closed]

One of our clients has an intranet connection and they are reluctant to use internet for our needs (data collection). They have 4 buildings. 1) Admin 2) Canteen 3) EM 4) Mill The configuration ...
2
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3answers
303 views

Block communication between hosts in the same VLAN

I've a pfsense firewall with a managed switch, and i created a VLAN: all works fine, but what i want to do is to block the communication between the hosts in my VLAN. For example, i want that an host ...
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1answer
33 views

Help this problem with Dhcp Server with two switches

I will try to explain my problem. I am trying that Switch 1 can give dhcp for pcs but i cannot, in Switch 0 I can give dhcp server in the pcs. sorry for my bad english ROUTER ! version 15.1 no ...
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1answer
39 views

Trade Floor Network Design Feedback [closed]

I have an assignment that I am working on. Now I admit, I am far from knowledgeable and I have nowhere to turn to for help at the moment. I am not asking for someone to complete the assignment for me, ...
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1answer
30 views

Create Accounting for Internet and merge ADSL, is there any way? [closed]

I have 4 Simple Wireless ADSL Modem that 4MB, 8MB, 16MB, 40MB Internet BW. I have one HP Server with 4 Network Ethernet Ports. I have 7 LAN based PC's, 2 Network Printer and some wireless station ...
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1answer
40 views

Change VLAN id in trunk

I have 3 L3 switches. They're connected to each other with a trunk (in which I need to define the allowed VLAN's). On SW1 I have for example vlan 100. On SW3 I also have vlan 100, but it's another ...
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0answers
27 views

Port 50000 UDP not passing traffic in cisco 1921/K9

I have two devices that use UDP on Port 50000 these are on vlan 103 they are IP's .222 and .223 trunked to an HP switch I have tried several ACL's but no luck, router config is as follows, Building ...
2
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3answers
91 views

Do VLANs with no ACL assigned block inter-VLAN traffic by default?

Supposing I have: int g1/0/11 switchport access vlan 11 int g1/0/12 switchport access vlan 12 int Vlan11 no ip address int Vlan12 no ip address By default, do VLANs with no ACLs block ...
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2answers
66 views

Configure VLAN with DHCP traffic properly forwarded

I have a windows DHCP server in VLAN 10 and I have wireless clients in VLAN 288. The VLANs are defined in my Juniper EX-4600 and the VLANs are tagged/trunked all the way to the Meraki APs. [DHCP]---[...
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22 views

How do I get Inter VLAN Routing going with HPE MSR2003 Router and a Cisco Managed Switch (generic type)

thanks in advance for your time and effort. I recently bought / acquired via obsoleteness a set of networking hardware which I want to extend my home lab with. The HPE MSR2003 should function as a ...
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1answer
73 views

Legacy Network, Adding new VLANs

I've recently been tasked with cleaning up an old network in where no passwords were provided, I was able to get in and look at the config. I've decided to replace 3 switches and add some new vlans in ...
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1answer
42 views

What does 22/23 and 10.3/11.4 mean and why cannot access internet?

What does this specification mean? I asked the one who gave me this but I did not understand. Vlan 22/23 192.168.10.3/11.4 a) Does 22/23 mean that 23 subnets have been allocated b) The forward ...
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2answers
59 views

Prevent a trunk from passing native (untagged) traffic

I am a network enthusiast and recently tracked down a problem and I'm looking for a solution. I've configured a small 8 port (CISCO SG200) switch as a trunk requiring tagging on VLAN1 and 2. In the ...
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2answers
611 views

routing between vlans not working

I need to put a Cisco router behind an ISP router. (The ISP doesn't allow us to use their modem only.) I've called the ISP technical service and they've set up the connection with me. Their router ...
0
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1answer
37 views

Frame transfer from one switch to another configured with VLANS

Hi, My question is related to the Vlan. And this question would consist of 2 parts. 1)Would Switch 1 know all the devices present in Vlan 2 or Vlan 3, including the ones present in the Switch 2. ...
2
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2answers
119 views

Aruba 2530 - IGMP Enabled, Querier on still no filtering

I have a in port 1 - 5 channels of multicast. On port 2 i have a computer. Both are in VLAN 10 untagged and a more bigger network tagged on port 3. I've enabled IGMP with: config, vlan 10, ip igmp, ...
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1answer
36 views

Securing VLANs for Wireless AP with multiple SSIDs

I'm deploying Wireless Access Points with two SSIDs: employee (VLAN 45) and guests (VLAN 46). I'm confused how I should configure the Ethernet port on the APs and switch. My preference would be to ...
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2answers
111 views

Does each VLAN need a dedicated uplink port?

I am designing a network consisting of close 60 ports, via a managed switch. I intend to deploy multiple VLANs: one for servers, one for desktops, one for guests, etc. I intend to use the firewall ...
3
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1answer
156 views

Dot1q tags, sub-interfaces

Please consider dot1q frames tagged 100 circulating on a LAN (VLAN 100). To go out onto the Internet, frames have to go through a PPPoE sub-interface which is configured as below: interface ...
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1answer
80 views

Can a VLAN have hosts with IP addresses outside it Subnet IP range scope?

I have 3 entities in my network. A server,switch and an appliance which acts as a DHCP/PXE server. When the server starts up, the DHCP server has to PXE boot the server. A seperate VLAN(1234) is ...
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1answer
32 views

Cisco Unity Connection guest, ESXi host, IP phones, vlan, subnet, ip addresses, qos

I have setup: VLAN 1 and subnet 192.168.1.0/24 for data VLAN 100 and subnet 192.168.100.0/24 for voice IP phones get their IP via DHCP on the subnet 192.168.100.0/24 all other IP devices get their IP ...
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2answers
379 views

VLAN Bandwidth Issues?

So here is my question. I helped to create this network for a client utilizing a trunked VLAN (QinQ) that connects into a Hybrid L2/L3 port. The client is concerned that VLANs will be bandwidth ...
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0answers
10 views

How to secure management wired network for public use (Mikrotik + UBNT + Zyxel) [duplicate]

In a network there is a router from Mikrotik, switches are ZyXEL GS1900-24HP and the access points are Unifi UAP AC-LR. I have configured three VLAN's: public, staff and management. All the access ...
1
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1answer
95 views

Same subnet on two firewalls

I came across a network setup in this way: Cisco device provided by the ISP serving as a bridge between the fibre line and the LAN. Cable coming out from port eth0 of the Cisco above going to a ...
1
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1answer
35 views

Cisco 3750 - configure to mimic multi location scenario

Good morning. For starters, I am less than a noob with cisco products. I can access, so basic trunking for our nec phone systems, etc. I have a 3750 that I'd like to configure to mimic a multi ...
2
votes
1answer
85 views

PVID for hp switch 1910

I am configuring layer 2 vlans between 3com 4200 switch and an hp 1910, I set the uplinks as trunk ports on both vlans. In 3com I set the pvid to permit all vlans but in 1910 how can I permit all ...
0
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1answer
87 views

Cannot ping or SSH into new Catalyst 2960-CX switch from the server VLAN (1)

I recently setup a Cisco Catalyst 2960-CX switch at work (I'm a SysAdmin at a SMB). Our workstations use VLAN 3, but our servers use VLAN 1. The management IP of the new switch (in VLAN 3) is 192.168....
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0answers
60 views

Brocade VDX 6740 VLANs and dual-mode

We have a VDX 6740 that serves as a switch for our SAN for our vSphere environment. We've introduced a new SAN that we'd like only one host to have access to. As I have it setup now: VLAN 2 for SAN ...
2
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1answer
90 views

Questions about VLANs

When no VLAN is configured on a Switch, all frames belong to the default VLAN which is VLAN 1. Are those frames in the VLAN 1 tagged!? And when talking about native VLANs, only untagged frames go in ...
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2answers
806 views

Does it make sense to map a VLAN to each LAN?

I saw a picture of a network-structure with VLANs in it: Why would somebody structure their network like this? Does this even make sense? I mean, they are in a different LAN, why then mapping a VLAN ...
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1answer
79 views

Really basic SG300 VLAN setup not working

My understanding of VLANs may need improved, but isn't the idea that you can run multiple LANs at layer 2 level over the same router if VLANs are setup correctly on the SG300? If so, I fail to see how ...
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2answers
56 views

Metro Ethernet and Q-in-Q: does customer's switch need to support it?

We're looking at getting a LAN extension for a branch office; we'd like head office VLANs to be present at this new location. Local telco says they can do Q-in-Q, but I don't believe our current ...
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1answer
46 views

Pinging/ssh-ing into just trunk interface. How is it done? [closed]

I'm a junior network technician and I was tasked at work to do a switch upgrade. The most important part of this task is to set up SSH so we can at least get into the switch remotely configure once ...
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1answer
63 views

How to create vlan for admin?

I wanted create a separate vlan for admin and give access to other vlan , so what is the procedure or method to do it?
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2answers
199 views

Gratuitous arp and unicast flooding

we have few 100s of access switches connecting to a core 10k in IRF. Here all our access is pretty much dumb does only L2 job. So what happens now is unicast flooding, technically MAC ages out, ...
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0answers
59 views

show vlan usage on cisco port configured with voice vlan

When a port is configured on a cisco switch for both data and voice, how does one show whether the connected device is using the voice or data vlan. interface GigabitEthernet2/0/8 switchport access ...
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2answers
56 views

1 Layer 3 Switch, 2 Vlans, 2 Subnets, and an Unmanaged Switch

Is it possible to for a device with the ip address 192.168.0.1 and Vlan 100 to communicate with an other device with the ip address 192.168.1.1 and Vlan 200 with the following architectures Senario 1:...
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65 views

ROAS driving me crazy

Can anyone else help me please! I have all clients connecting to a L2 switch, these trunk (etherchannel) into another L2 switch, which then trunk (etherchannel) into another L2 switch (core) and these ...