a device that bridges network segments, operating at the OSI link layer level.

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14 views

Server 2012 R2 Hyper-V Virtual Switch host mac address conflict 331FLR

I have 3 new HP DL360G9 servers all running Server 2012 R2 standard with the Hyper-V role installed. All the servers have the built in Intel 331FLR 4 port gigabit nic. I have the ports teamed into 2 ...
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0answers
22 views

How to learn which ethernet port is connected to which switch on a Linux server? [on hold]

I am working on a team that automate the installation of large scale clusters. One of the issues we face is that we do not always know how, and in which order, Linux will identify the network ...
2
votes
0answers
22 views

Stream IPTV through SSL VPN

I have a question about streaming IPTV through Cisco ASA5510 ssl vpn. My current setup at the moment is: Public - firewall (asa5510) - L3 switch - L2 switch But my iptv source feed is coming to L3 ...
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votes
1answer
30 views

Switch port VLAN configuration

I have a problem with my switch: ProCurve Switch 2810-48G I got 2 VLAN with this configuration: vlan 1 "DEFAULT_VLAN" untagged 1-36 ip address 172.16.40.201 255.255.252.0 tagged ...
1
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1answer
96 views

Nic Teaming Windows Server 2012 R2 - No network connection

I have 2 100Mbps NIC cards installed into PCIe slots and connected each card to it's own desktop 8 port switch. My Settings: Mode: switch-independent Load Balancing: Dynamic / Address Hash VLAN: ...
1
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1answer
46 views

Reasons for missing network access on Cisco switch

I'm having problems with a Cisco Catalyst 2950 switch, specifically I'm unable to connect to the router/get internet access through it. The setup is as follows: WAN connected to Router (MikroTIK ...
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0answers
29 views

Connecting a switch to a VDSL2 model causes upload speeds to go to 0

My network configuration has my main router connected to a secondary router which is in bridge mode, and I have a computer connected via ethernet to that secondary router. If the connection between ...
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0answers
19 views

Clear interface config using macro and range in cisco

I want to write macro which than i will apply to interface range and clear to default interface configuration in that range. Is it possible?
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1answer
48 views

Managed Switch Stability

Our office has been experiencing a series of rolling internet outages over the last couple of weeks which is driving everyone crazy. After isolating a few individual components, my current theory is ...
0
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1answer
32 views

Forcing traffic through an IPS on a flat network through a bump in the wire

I have the following topology: Click here, unfortunently I don't have enough rep to post images Essentially I would like the packet flow to go from PC1, to the Core Switch, to the Edge Switch, and ...
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0answers
24 views

PowerConnect 2808 and syslog

I have a pair of Dell PowerConnect 2808 managed switches. I am attempting to enable syslog on them, but not having any luck. I have searched the web interface, used telnet to log into the CLI ...
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votes
3answers
48 views

Ports from switch to system

I have rcently joined a company and we want to migrate our network to 10.0.0.0 ip address range from 192.168.0.0. Also we want to configure few vlan's But the major challange i am facing is that ...
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0answers
32 views

burnt Switches connected directly to the internet

We got a setup with a switch between the cable modem/bridge and the two router ports. We burn this switch every 6 months, and it has to be replaced. Symptoms are heavy packet loss or in general very ...
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0answers
27 views

Dell M6348 switches, how to disable Mac address learning for specific VLAN

I'm trying to disable the Mac-Learning for a specific VLAN on this switch. I was able to do the same thing on my Juniper switches with the command: no-mac-learning; however that doesn't seem to ...
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votes
2answers
57 views

Can I connect many switches to a switch? [closed]

I am trying to make a campus network.I haven't any experience. In campus,there are center building and many buildings.I use many switches(for pc,phone,sec-cameras) in a building.And I want to connect ...
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votes
1answer
29 views

Why is there flooding on L2 but not on L3?

Why is it, that on L2 (when there is no MAC Table entry for a new packet) there is MAC Flooding. But at the same time on L3 there is an ARP request (when there is no entry in the ARP table for a new ...
1
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1answer
26 views

What are the different Status options for Dell show copper-ports command?

When the below command is issued in a Dell N2024P/N3024F switch show copper-ports tdr The following output is generated Port Result Length Date Gi1/0/1 OK 0 - 10 Jan 1 ...
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2answers
101 views

Avaya 4850 GTS & VSP 7000 - setting up a fibre trunk, no MLT

I'm a junior network/sys admin, and I'm stuck (and my seniors aren't sure what to do). I have a VSP 7000 switch which is a core switch. And a 4850 GTS switch which is like access switch. The switches ...
3
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2answers
173 views

What is the proper way to connect cables from a patch panel to a switch when you have more ports on the patch panel than on the switch?

We're in a situation at our new building where we have 58 drops but only 48 ports on our switch. Roughly 40 of our drops will be in use, but it's a random selection ranging from 1 to 58. Typically I ...
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votes
1answer
25 views

What happens when a switch goes offline? and can they be easily exploited through open wifi?

I have two simple questions regarding switches: When a router/ proxy server/ dns host fails, they tend to not allow any packets through. Is this the same with a switch? A switch is connected to 3 ...
0
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1answer
53 views

How can I tell if a cisco router is dropping pings due to DOS suspicion or if it's experiencing packet loss?

We use a PRTG server that's connected to a cisco 6500, which feeds a large network of about 1200 switches and radios in a router-on-a-stick topology. In PRTG I'm able to set a 'ping burst' sensor on a ...
0
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1answer
21 views

Getting L2 switch info from the data port on a Cisco IP phone?

Here's what I'm trying to do: I'm trying to get the information on which switch/port that a jack wired to. On that jack, there is a Cisco IP phone (7942), and a computer plugged into its data port. ...
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0answers
38 views

Brocade 6740T connect to management port

I'm having trouble connecting to the management port of my Brocade 6740T switch. Here's my setup: external network --> dumb switch --> Brocade 6740T --> servers | ...
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1answer
150 views

How to use two different ISP on same LAN with one Ethernet switch?

Sorry if same question is asked on Stackoverflow. I searched and tried some configuration but are not working in my case. I have a LAN with 6 machines which are on same network (each other can be ...
1
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1answer
39 views

Setting up a small network with a redundant WAN setup

Asked on the network stack but referred here, partly because lower grade equipment. Small office and we are trying to piece together a network with our two wans (diff ISPs) a switch and a few ...
1
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0answers
99 views

HP ProCurve 4208vl - Show PSU information?

I'm working with a few older HP ProCurve 4200-series chassis switches (4204vl and 4208vl). Some of these units have single power supplies, while others have dual power supplies. I'm trying to ...
1
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0answers
51 views

Why would command line parameters not be recognized?

I have a small console application written in C# for .NET 4.0. The application takes 2 parameters, either "-run" or "-clr". So it would be called via command line like this MyConsoleApp.exe -run ...
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0answers
45 views

Vlan trunk between three switches and KVM Guests

I'am trying to find information regarding the appropriate configuration between three switches and KVM. More depth as per diagram. I need to create a tunnel for traffic created on sw1-port5 to be ...
1
vote
1answer
75 views

multiple subnets on the same switch(es), how can I isolate it?

I am by no means an expert when it comes to networking, I've inherited one which I am pretty much sure is wrong and due to my lack of experience I have no idea how to clean it up. The network looks ...
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0answers
96 views

Getting chunks of high ms when pinging local / external IP addresses?

I am having difficulty identifying what a specific problem with one of your vlaned networks. They have a voip phone which regularly cuts out during long phone calls. I have done several ping tests ...
15
votes
3answers
376 views

Phones on some switches cannot complete DHCP process

Background I have a Windows DHCP server (Server 2008 R2) handing out addresses for several scopes. One of those scopes is for some Mitel IP Phones. The phones are configured to use dhcp option 125 to ...
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1answer
53 views

Modem, Router, Switch configuration [closed]

I have two switches in different rooms, both wired to a router (LAN ports) which is in turn wired (WAN port) to a cable modem. I want to switch from cable to DSL for cost reasons, but keep the router ...
0
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2answers
54 views

Is there a way to query all the mac addresses in a network?

I know this question was flagged "off-topic" and "non-professional", but when creating a gateway or IDS, this might be quite relevant. Also, Google finds nothing usable... There is a thing called ...
1
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1answer
45 views

Allowing a device blocked by port-security

Lets say I have port security configured on a switch's ports like this: Secure Port MaxSecureAddr CurrentAddr SecurityViolation Security Action (Count) (Count) ...
0
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1answer
225 views

OpenWRT: Redirect traffic from LAN port #4 to specific IP address

I am working with a TP-WR1043ND OpenWRT router which allows port mirroring, as described in the dedicated wikipage. I'm mirroring the WAN port (#0) to LAN port #4. There is no cable in the LAN port ...
1
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5answers
113 views

Multiple Computers Running IIS with a Singular Public IP how to handle incoming communications?

At our company, we have three separate servers that house IIS currently. Each of these three servers have the same public IP address and essentially reside on the same network under different subnets. ...
1
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3answers
49 views

Must a L3 switch always have an IP address?

I have 3 L3 switches connected as shown below: All devices are in the same subnet and have IP addresses : 192.168.150.X/24 Shouldn't the switches be able to forward traffic without requiring IP ...
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votes
1answer
174 views

Setting up pfsense on a small business network for firewall use

I have approximately 20 machines that will all be on the same subnet with a pfsense firewall. I have no experience with pfsense, so I am just starting out. I have the following configuration: The ...
0
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0answers
82 views

Layer 3 switch redundancy solution (with vlan's, stp)

So basicly I have a setup which I want to get to work but i'm unable to. It's possible I am overseeing a lot of things but let's get to it anyways. The current situation is a network with 4 switches ...
1
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0answers
273 views

Cisco SG300 SNTP servers always down

I'm trying to setup the SNTP of a new Cisco SG300-48 Switch in L3 mode. So far I have enabled the Main Clock Source (SNTP Servers) option (Administration -> Time Settings), set my time zone and ...
0
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0answers
209 views

3Com 3CDSG8 Serial Console Input Not Working

I have a 3Com 3CDSG8 Office Connect Managed Gigabit Switch. I am trying to restore factory defaults. I don't have original rj45 to db9 connector cable. So i am trying to make a new one to connect ...
0
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0answers
61 views

Alcatel 7210 SAS-D boot loop

I was given Alcatel Lucent 7210 SAS-D that a previous user(s) messed up. When I'm booting it, it keeps looping in the console over and over. Here's the text it keeps looping: ...
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0answers
42 views

Redirect traffic through a computer to another connected to the same switch

I am trying to setup a single sender, single bottleneck and single receiver network. Network Image The router in the image is a computer that has ip_forwarding enabled. PC1 has the default gateway ...
1
vote
1answer
42 views

Add non-flex switch to existing switch stack

I have an existing stack consisting of two CISCO 2960-S series switches. They are connected using the flex-stacking cables in the back, the top one being the master and the lower being the slave. I ...
0
votes
1answer
321 views

Default gateway config in FlexFabric 5700

We've taken delivery of a brand new set of shiny FlexFabric 5700 10GbE switches. I've read through the config and setup guides provided by HP and they're great, except that they outright lie about ...
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0answers
71 views

BroadCom 5720 Multi-Switch Connection failing to achieve full bandwidth

We have following Setup: 2 redundant Dell 2848 Switches, identically configured and connected via 8-Port LAG on Ports 41-48. 2 identically setup Dell R730 with BroadCom 5720. Operating System is ...
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1answer
126 views

enable lacp mode active on isr 2951

Any idea if ISR 2951 support LACP ... i don't see any cli command to enable it. My router IOS version is 15.2(4)M7. Can you help please. below is my config: interface Port-channel1.1 description ...
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1answer
94 views

Is there a Cisco IOS command for finding out the serial number of a switch / router?

I am doing an inventory of all of our switches and I was wondering if there's a Cisco IOS command that will return the serial number for a switch and router? Thanks in advance!
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0answers
74 views

Dell PowerConnect Link Aggregation Failover Failed

We are a small office with two Dell PowerConnect 5548 switches that, together, cover all of our servers and hosts. I had them connected using ports 47 and 48, which I placed in a LAG. Port 47 was ...
2
votes
0answers
189 views

Display port security state of an HP 3COM 5120 switch port

I'm using an HP-A5120-24G-SI switch and I'm asking how to obtain the current state of the port-security module for a certain port. I'm able to view the current settings using display port-security ...