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

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1answer
44 views

RADIUS authentication requests not relayed to RADIUS server

I am trying to set up a RADIUS server for 802.1x NAC over a Cisco IE 3000 Network Switch, using freeRadius to implement it. I know the switch knows where the RADIUS server is because I set up the ...
1
vote
0answers
58 views

How to replace a fan on a 3com SuperStack 4500 unit (and where to find a fan)?

I have a couple 3com SuperStack 4500 switches with failed fans. I am not having luck locating information on HOW to actually replace the fans, or where to find a replacement/what kind. I know what ...
5
votes
2answers
929 views

HP ProCurve 2920 switch stack topology for TWO switches? Ring vs. Chain vs. trunk?

I have a customer whose two HP ProCurve 2910al PoE switches have failed. This was backing a VoIP deployment for a small call center. They are interested in replacement PoE switches, but there's a ...
0
votes
1answer
93 views

Configuring a RADIUS server for 802.1x over a Cisco Switch

I am trying to set up RADIUS authentication over a Cisco switch and I have gone through every tutorial they have. I am able to get the RADIUS server to authenticate when I access the CLI of the Cisco ...
3
votes
1answer
185 views

Determine what MAC addresses are connected to a given port on a Netgear GS724T via SNMP?

In looking through the output of an snmpwalk against our GS724T Netgear switch I was surprised that it doesn't list what MAC address(es) are connected and/or using a given port on the switch. This ...
0
votes
0answers
13 views

How can I enable debugging in zte switches running

We have recently bought some zte switches, they are affordable and have quite a lot of features. product page. At the moment we are having some issues with STP configurations when connected to a ...
0
votes
1answer
350 views

Voice VLAN Configuration on Cisco SG300

We currently have a single Cisco SG300 switch on our data network. We are introducing a hosted VoIP system. As such we will be installing a second Cisco SG300 (to account for growth and new phones) ...
1
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0answers
97 views

Windows mounted network drives slow after upgrading switch

On our small business network our old 10/100 consumer grade switch gave up the ghost, and we replaced it with a proper business-grade gigabyte switch. After wiring it in our Linux and Mac users ...
2
votes
1answer
65 views

Tagged Packets on native VLAN General Port

Scenario a) I have a Switchport (g1) in General-Mode. Say g1 is member of VLAN1 (native, untagged) and VLAN2 (tagged). Another Port (g2) is in Trunk-Mode, and member of VLAN1 and VLAN2 If i send a ...
2
votes
4answers
87 views

Is there any possible way in which unicast packet from one machine sent to two machines?

Is there any possible way in which a unicast packet from one machine sent to two machines? How does it occur. Anybody faced such condition occasionally?
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votes
2answers
60 views

Why arp cache is stored in both machine and switch? [closed]

I heard that arp cache is stored in both machine and switch... Is that true. When packet need to transmit from machine 'A' to an machine 'B' means we can simply send the packet to switch. As ...
2
votes
2answers
231 views

Is it possible to configure a private VLAN on a switch and still access each server via a public IP?

I'm sure this is a very basic/common networking problem. I have 1 web server and 2 database servers that are co-located in a data-center. I have been issued 10 public IP addresses and I have a 10 port ...
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0answers
80 views

Communicate between Voice and Data VLAN

I have a network of computers, on which I also have an Avaya IP Office phone system with several IP phones. Currently the IP phones are on their own IP subnet range, but I want to create a separate ...
0
votes
1answer
256 views

Enabling Jumbo Frame on Cisco 2960G

I'm having issue with enabling jumbo frame on my Cisco 2960G. Here is what I tried, and what I got: Switch(config)#system mtu jumbo 9000 vb:: Read-only file system Changes to the system jumbo MTU ...
1
vote
1answer
86 views

Enterasys - Ports not working after power surge, but then work later on

We run all Enterasys switches (C and B) stacks. All my switches are behind some pretty good surge and battery backups (APC and Tripplite). 3 Days ago we had a power surge at our company. Nothing shut ...
1
vote
1answer
77 views

3750s not logging mac address changes?

I have enabled mac address change logging on my Cisco 3750s but I'm not getting any results. What am I missing? I've moved hardware a couple times and set up a couple new VMs with totally new MAC ...
2
votes
2answers
367 views

Does 5-4-3 rule apply to stackable managed switches?

We have 7 Dlink DGS-3120 48 ports Gig switches stacking together and all ports are being used. Each switch represents a single segment of our working area. it is working well without any issue. My ...
0
votes
1answer
301 views

Fortinet Fortigate software switch configured IP not accessible

I'm trying to get a software switch configuration working on a Fortigate 100D. It appears like devices plugged into the software switch ports can communicate between each-other, but they cannot reach ...
0
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2answers
147 views

Calculating required uplink capacity of network switch [duplicate]

Is there any common method (usable in practice) for estimating the uplink capacity of switch based on known number of users connected to this switch and the maximum internet speed they are allowed. ...
0
votes
1answer
33 views

Broadcast stop via loopback kills bandwidth

Why does creating a broadcast storm by directly connecting two ports on a switch cause the bandwidth to all the other ports to cease?
0
votes
0answers
44 views

ZyXel ES-2024 - Mirrored port showing duplicated traffic

I have a ZyXel ES-2024 PWD switch. I would like a computer plugged into port 26 to see all traffic that passes through port 2, both inbound and outbound. I have configured port mirroring for the ...
0
votes
2answers
62 views

2 lans on the same switch safe? [closed]

I have a modem with 5 ports. Each port gets a static IP address from the web. Basically if i ping one of those static IP addresses from home i am pinging directly one of those ports. On the first ...
0
votes
0answers
91 views

Connectivity between two switches using fiber optic cable

I have two DLINK switches(DGS-1500-28 With DEM-311GT Sx 850nm 1.25Gbps and the other switch DES-3026 with DEM-201F 1port 100 Base Fx Module) and I would like them to communicate over optical fibe ...
1
vote
2answers
120 views

Switch won't enable ports connected to network printers

I recenlty set up two different switches in two different locations and had similar problems with both of them when it comes to connecting a network printer. Switches: Switch 1: Netgear GS724T 24 ...
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votes
1answer
291 views

How to access device on switch from another computer? [closed]

I have several computers all connected to the same switch. Some computers are running RHEL, one is running CentOS. The CentOS machine is connected with NIC 2 to switch 2, and NIC 1 to switch 1. The ...
0
votes
1answer
79 views

Netgear GS108T v2 switch - packets exit wrong port

I have an eight port Netgear GS108Tv2 between my firewalls and their gateways. One switch serves my two firewall and the two ADSL and SDSL routers. One of the firewalls (pfSense) pings its gateway ...
0
votes
0answers
72 views

Can a 100Mbit switch throttle the internet connection?

We have a rather peculiar problem with internet speed in our office. Recently, we switched to a fiber-optic connection. We're supposed to have a 100Mbit connection (up and down). Here's how it has ...
0
votes
1answer
54 views

Connect Multiple Networks Wirelessly [closed]

I have a home network using a router to connect computers both wirelessly and with network cables. I also have another separate network about 10m away from my home network that is networked via ...
0
votes
1answer
91 views

Snmp graphs showing high traffic on switch but not in machine interface

I've setup a SNMP server on the office with ubuntu and cacti. It's connected to a 22 port switch. I've configured the following SNMP devices: 2 adsl routers, 1 peplink balancer, 1 wifi access point, 2 ...
0
votes
0answers
41 views

What should I consider when I plan a meaningful monitoring for SNMP Switch (SG200-50)

I am currently planning the monitoring of a switch and would like to consider beforehand what I need to be closely monitored in order to obtain errors and warnings are also useful. I have a Cisco ...
0
votes
0answers
127 views

Connecting internet uplink to switch or firewall

While I am using Cisco kit, this isn't really Cisco related, more general network design. In the past I have connected internet connections straight in to a layer 3 core switch, 3750X's, 6509's and ...
2
votes
2answers
187 views

Best way to hide ILO/IPMI management port and not using public IPs

I have 5 servers, each has one internet port and one ipmi port, so I am using 10 external IPs. Its a bit problem with a provider to get more IPs and also I want to hide IPMI ports since sometimes ...
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votes
1answer
36 views

Router connect same 2 ports? [closed]

What it will happen if 'accidentally' i will connect 2 ports with the same utp cable? I'm asking here since i don't find anyware such a stupid and silly question but i'm curios about it, the router ...
13
votes
2answers
1k views

How do I ground a network switch?

I read in a lot of places that it's necessary to ground networking equipment. In a small SOHO environment where there are, say, 4-5 systems and each system is grounded, is it also necessary to ground ...
0
votes
0answers
50 views

For a typical broadband ISP, are nodes on the same subnet routed together or are they bridged?

For a typical broadband ISP, are nodes on the same subnet routed together or are they bridged? In other words, what kind of path will a packet take when going from one node on a subnet to another for ...
0
votes
1answer
33 views

Is there a device with multi auxiliary (AUX) ports to configure multiple devices

Level: Beginner Sorry for the confusing title. I shall try to explain my best to explain my question. Question: Is there a networking device named X that has multiple AUX ports so that I can connect ...
0
votes
0answers
17 views

Factory Reset Enerasys

Kind of a 2 problem issue, but I have a feeling one of them is my problem. I have 2 C2G124-24 switches. They work fine and function properly. Problem I am having is that I can no longer access them ...
0
votes
1answer
189 views

cascading load on connected Alcatel-Lucent OmniSwitch units via VLANs

We are having an intermittent issue with a campus of Alcatel-Lucent Omniswitch switches, ranging from model 6000 to 6850. We are having a problem tracking down the root cause of our issue. The seems ...
0
votes
1answer
38 views

different Native vlans on the ends of trunk link

http://www.techexams.net/forums/ccnp/53867-different-native-vlans-ends-trunk-link.html so i read this, but i still can not get traffic between two ends of a trunk link, each with a different native ...
0
votes
5answers
145 views

Giving an IP address outside the network to the router to safely make it a switch?

In our office, all machines use IP address 192.168.0.x with subnet mask 255.255.255.0, the network setup is as below: We only had routerA before. But since its wireless signal is too weak (much ...
1
vote
1answer
50 views

Strategy for forcing cam table updates from custom hardware

I have a system that consists of a control PC, two layers of switches, and 50 custom devices. The PC continuously streams a total of 5.8MB/sec (6000 ethernet frames/sec) to the devices. I have ...
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votes
2answers
66 views

Network Switch Terminology (MAC address table) [closed]

When a switch has the ability to learn what MAC addresses each of its ports serves, then uses that to determine which port to send ethernet packets out, what is that feature called? Also, does every ...
-3
votes
1answer
49 views

Router Switch hanged down [closed]

I have a switch placed in department and connected through Media Converter which is directly connected through optical fiber cable from 3com Switch. Now the issue is Some times suddenly the Endpoint ...
5
votes
3answers
897 views

Can internet gateways be plugged straight into a layer 2 switch?

tl;dr Internet gateways (eg., cable modems, fiber optic gateways) don't function properly when they aren't behind a device with "layer 3" or routing capabilities, correct? Incredibly long backstory ...
5
votes
1answer
137 views

HP 5500 switch manual states SNMP traps impact performance and advises against their use unless “necessary” - why?

We just bought two HP 5500-24G-4SFP beasts and I'd like to properly integrate the switches into Nagios. Most of our current monitoring polls actively via SNMP so I figured it would be wise and use the ...
3
votes
3answers
2k views

What do switches do to tagged and untagged VLAN packets?

Let's say we have a 4-port switch that is VLAN capable. 1 2 3 4 Port 1 is TAGGED to VLAN10` and `UNTAGGED to Default_VLAN(1) Port 2 is UNTAGGED to VLAN10 Port 3 is UNTAGGED to ...
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votes
1answer
3k views

How to set up 2 separate VLANs on one switch (HP v1910-48G switch)

I need some advice on how to set up 2 VLANs (on one switch, I have HP v1910-48G switch) that separate broadcast domain and also share a single internet connection. The two Vlans must remain separate, ...
0
votes
1answer
64 views

Cisco switch restart doesn't reload config

Something really strange happened to me today. I was configuring a 3750 switch and halfway through the changes I messed up. So I did what I've always done, unplug the power cable from the switch and ...
0
votes
1answer
71 views

Can a home router separate private network? [closed]

I've just come across this network diagram: http://computer.howstuffworks.com/router1.htm And I am thinking if it can be done with a typical home router. Normally for home router, when we plug a ...
2
votes
2answers
75 views

Cisco Switch went mad

tI have a Cisco SLM2048 Smart Switch which I can't access anymore. The switch is working just fine but: I can't reach it by web interface Doesn't seem to be able to reset it, even if I hold reset ...