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

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25 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 ...
0
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0answers
9 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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0answers
36 views

Domain PC freezes, the NIC blocks all L3 connectivity on that switch

I manage a domain with 80 PC and for over a year I have a big unsolved problem. I redistribute windows update using a WSUS on domain. The PCs after the user finish working and leave, start installing ...
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3answers
47 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
14 views

local network : route to host going through the wrong switch [closed]

I have two main switches on my building , one in the data center(3COM 2948 SFP PLUS) and another in the administrative area (3COM 2952 PLUS) both in the same network, dhcp disabled. I am close to the ...
1
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0answers
29 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
16 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
49 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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1answer
22 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
14 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
37 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 ...
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votes
2answers
136 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
28 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
15 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
22 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 | ...
0
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1answer
76 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
vote
1answer
32 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
vote
0answers
31 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
39 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
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1answer
61 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
66 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 ...
16
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3answers
243 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
44 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 ...
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2answers
46 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
38 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
votes
1answer
175 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 ...
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5answers
88 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
47 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 ...
-1
votes
1answer
153 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
66 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 ...
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0answers
193 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 ...
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0answers
141 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 ...
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0answers
41 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
36 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
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1answer
37 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
207 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 ...
0
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0answers
63 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 ...
0
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1answer
103 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 ...
0
votes
1answer
66 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!
1
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0answers
64 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
167 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 ...
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votes
1answer
41 views

Switches without SFP and with SFP

So I am looking at two different rackmount switches, one I do not have SFP ports on there and one that does. Would it be possible to have those two switches linked up through just looping through ...
0
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0answers
20 views

Enterasys S8 switch shows tbp port

When I see sh port status on Enterasys s8 switch, it given me list of tbp ports as follows: tbp.0.1 down up other tbp.0.2 down ...
0
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2answers
313 views

Unable to add allowed VLANs to trunk and port not trunking

I am unable to add any VLANS to be allowed on trunk and the port is not trunking. I've tried: Switch0#configure terminal Enter configuration commands, one per line. End with CNTL/Z. ...
2
votes
1answer
224 views

Unable to remove a port from default VLAN

I am unable to remove a port from my default VLAN. I've tried: Switch(config)#interface FastEthernet 0/1 Switch(config-if)#no switchport access vlan 1 It has no errors but when I check it using: ...
1
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1answer
156 views

Setting up VLANs using GS724T & Draytek 2860n-Plus

I am having a world of problems here and can't see what is going wrong! The Plan: Use the Draytek to connect to the internet and provide WLAN access. Single port to connect to the GS724T and tag ...
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votes
1answer
75 views

Is it possible to mount these pieces of equipment vertically, together? [closed]

I have a Cisco 2811 and 2950 and a Dell PowerEdge R720 server. I have the 2811 and the 2950 in a wall mount that holds the two pieces of equipment vertically (the jacks are facing upwards). I'm ...
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votes
1answer
61 views

Is this a switch loop?

I have a quesion regarding creating switch loops. I have 1 server with 2 network cards (nic1 and nic2) and 2 switches (sw1 and sw2) Question: Am I creating a switch loop if I connect nic1 to sw1 and ...
-1
votes
1answer
41 views

Brocade FCX648-I In password recovery process

Brocade FCX648-I In password recovery process I get to a Monitor> prompt. The password recovery instructions tell me to assign a new password at this point but doesn't tell me how. There is a link to ...