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

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2
votes
3answers
953 views

monitoring switches with Nagios

I'm trying to monitoring switch with Nagios. I had made everything like in this tutorial, but I'm getting Status Information in Nagios browser window like this: (Return code of 127 is out of bounds - ...
1
vote
2answers
29 views

set the Ca name on unmanaged mellanox switch

How can I set the Hostname/Description of a Mellanox/Infiniband unmanaged switch? I would like a way to abstractly distinguish quickly which switches are which when doing 'ibswitches' or ...
0
votes
1answer
381 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 ...
0
votes
1answer
34 views

ensure “switch redundancy” on a network

I'm struggling in connecting two Windows 7 PCs (each with a 2 port Intel NIC) via two complete redundant paths. And I want to make it transparent to the services on that system. I was thinking on ...
-2
votes
3answers
55 views

how to detect remote switch speed and duplex? [on hold]

We have a linux (RHEL) system which will be deployed in unknown networks. To support old networks we want to have autoneg configurable. how do you how detect if remote switch is autoneg on|off, and ...
1
vote
1answer
30 views

Host using Linux bond mode 1 (active/backup) connected to 2 x independent switches

I have a host using Linux bond mode 1 (active/backup) connected to 2 x independent switches. Please can someone confirm if this is possible for successful failover between NICS or do I have to ...
0
votes
1answer
27 views

Netgear FS728FP - VLAN traffic isn't flowing

I'm trying to set up separate VLAN's on a new Netgear FS728FPv2 switch. I've never configured VLAN's before. The switch works fine with the default config, with every port as UNTAGGED at VLAN 1 ...
12
votes
4answers
47k views

What's the difference between a Layer 2 & Layer 3 switch

What's the difference between a Layer 2 & Layer 3 switch? I've always wondered and never needed to know until now.
6
votes
3answers
2k views

What is an “FX port” in the context of a switch?

Looking at this switch datasheet, the concepts of "FX port", "FX switch" and "inline FX" crop up. (The obvious Google searches are not really helpful.) What does FX mean in the context of a network ...
5
votes
4answers
1k views

How to wire 20 computers and 20 phones and 1 server into LAN?

I have currently 3 switches Two Netgear JFS524 with 24 slots, One Belkin with 16 slots. Server DSL Internet Router. Main question is how to connect switches together, two Netgear's are next to each ...
-1
votes
1answer
31 views

How would I access a Cisco router for configuration/management over the public internet

I want to connect a cisco router (2950 series) to my normal broadband router supplied by my ISP. I want to test whether I can access the router over the public internet for configuration/management. I ...
0
votes
1answer
28 views

Mikrotik switched VLAN configuration

With Routerboard 450G I want to configure the 5 Ethernet ports as follows: ether1: vlan3, untagged ether2: vlan1, untagged ether3: vlan2, untagged ether4: vlan2, untagged ether5: vlan1-vlan3, tagged ...
3
votes
1answer
31 views

pfsense port-security limit mac to 1 (any mac allowed)

I am trying to set up HP procurve routers (25xx and 26xx) with port-security. Goal is to allow client devices and routers. But to disallow a switch, AP or a router in bridge mode. This should be ...
1
vote
3answers
2k views

Fibre (Fiber) Optic - Mixing SFP's and Switches

My generic question is: Can you mix switches on the opposite sides of a fibre link, or more accurately different manufactuors tranceivers. We just bought several new HP ProCurve v1810 series switches ...
0
votes
1answer
18 views

VMware systems not working on SRW2048 swtich

I received an old Linksys SRW2048 gigabit switch and have used a straight-through serial cable and the console port to reset the flash config back to defaults so that it is configurable for our ...
1
vote
0answers
44 views

iSCSI switch replacement (2 VMware hosts)

Good morning everyone, I recently bought two unmanaged NetGear 1gb switches to replace our older unmanaged Cisco 1gb iSCSI switches. Right now, the only devices currently connected to this network ...
0
votes
2answers
1k views

Mismatch between IP address and MAC Address

Suppose you have two interfaces in the host belonging to the same subnet connected to a normal L2/L3 switch port which has a single vlan with interface IP 10.0.0.1. nxge0 (10.0.0.201) ...
1
vote
1answer
56 views

Packets being routed to the wrong IP

Looked around, can't find a similar issue anywhere... I have been having some very strange and hard to explain problems on my network lately, and in my efforts to find the cause, I came across an ...
12
votes
3answers
1k views

Why is CAT rating not applied to switches?

I see patch panels all come rated as CAT5e, or CAT6 (and so on). I understand the difference between CAT5e and CAT6 cables, more stringent interference shielding, etc. What I don't understand is why ...
1
vote
5answers
5k views

What are my options in replacing the noisy fan in my Linksys Cisco SRW2008P managed GigE switch?

My first managed GigE switch, the Linksys SRW2008, was a dream, until it started randomly chattering on various ports. That started while I was on the road all the time, which made it take forever to ...
1
vote
2answers
69 views

Trying to hookup 10-15 laptops to a switch, could someone point me in the right direction?

Let me start off by saying I am not a system administrator, however I am desktop client support. I have the need to have about 10-15 laptops to be hooked up to a switch that gives all 10-15 laptops ...
0
votes
1answer
26 views

IRF HP 6125G Blade Switch : determine MAC address of each member

I have a little problem with my HP 6125G Blade Switch. Just to precise, I don't understand much IRF configuration. So i have a hp C7000 blade systems, with embeded blade switches (4). The switches ...
-1
votes
0answers
29 views

Accessing HP Procurve JG927A

I have two new JG927A switches that I'm trying to access via the console (or telnet), but the serial console is not accepting any keyboard input (though I can see the startup sequence), and ...
1
vote
2answers
6k views

What is the command to enable 3rd party SFP+ transceivers on Arista switch?

Does anyone know the command that enables the usage of 3rd party SFP+ on an Arista 7148S switch?
2
votes
2answers
192 views

3COM Switch dropping broadband

We have a 3COM 3C16980A Superstack3 switch in our office and it keeps dropping out broadband connection. Are setup is this: Internet -> BT Box -> Wifi Router -> Switch -> cables run into the walls to ...
3
votes
1answer
154 views

HP ProCurve Preventing Loops and Users Plugging in Unauthorized Switches/Access-Points

We have a HP ProCurve 2530-24-PoE (J9773A) switch, recently I had a user who plugged in an Apple wireless hardware device to the network - whenever it was connected I got a ton of broadcast warnings ...
3
votes
0answers
20 views

Opennms - Physical interface update on Cisco Switches

I'm using opennms version 16.0.2-1 on ubuntu server 14.04 LTS. I'm configuring some cisco switches to send traps to openms. The traps are notified to events in opennms, if i put a physical ...
5
votes
2answers
3k views

HP Procurve 2920 VLANs with DHCP cannot ping

I have problem setting up working VLANs and DHCP server on HP Procurve 2920. My problem is that I cannot even ping computers between VLANs with static ip addresees. winXP pc on VLAN101 with ...
15
votes
3answers
3k 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
62 views

Cisco 3120 blade switch does not boot after power outage

We use a Cisco WS-CBS3120G-S in a HP BladeCenter. After a power outage, the switch will not boot anymore. The switch dose not output anything on serial console. The LEDs SYST, STCK and active (under ...
2
votes
1answer
41 views

Adding a wired network to our small office

I'm adding a wired network to our small office. We have about 10 employees but may double to 20 in the next 6 months. We have a PC Engine APU router with three ports: Port 1: Uplink Port 2: Unifi ...
0
votes
1answer
63 views

How to route traffic between 2 VLANs on different subnet

I have the following problem: I have one interface eth0 with IP 172.20.51.61/24 I have configured 2 VLANS on the same machine: eth0.120 : 172.20.52.61/24 eth0.200 : 172.20.54.61/24 I also have a ...
3
votes
0answers
22 views

How to get the topology of a layer-2 switch network with the switches' forwarding tables?

Suppose I have a list of layer-2 switches that do not support LLDP (Link Layer Discovery Protocol) but support SNMP. I have the management IP addresses of these switches, but I don't know how they are ...
-1
votes
1answer
57 views

Connecting Win7 to Win7 through switches, EnGenius, and Routers

Weird networks, causing weird problems. I am a new employee at this company, the network is a bit weird, but I have figured it out to a degree. I have some networking knowledge, but not greatly ...
-3
votes
1answer
34 views

configuring cisco switch sg-300 20 can't change vlan name

I have this very strange issue. Not a biggy because I can do it using the GUI but it still drive me nuts. Just out of curiosity whether anyone has been through this and know the answer to it. It's ...
-1
votes
2answers
56 views

Will computers connected to a switch have a different ip? [closed]

I want to set up a network switch with several servers connected to it that must be port forwarded. Please refer to the below diqgram for my setup: ___Computer 2 | ...
0
votes
0answers
405 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 ...
6
votes
2answers
8k views

Finding (and stopping!) Rogue Devices from HP Procurve

We seem to have a problem with rogue devices on our network. From DHCP (on Win2003), I can see names of devices that are clearly not ours. From the name, I suspect it's a wireless AP (WGR614 looks ...
1
vote
2answers
4k views

How to connect to a Netgear SRW224G4P serial console port?

I have two Netgear SRW224G4P switches with serial console ports. I'm using a Sabrent USB 2.0 to serial cable adapter with a female-to-female serial cable. I'm running Windows 7 64-bit and using putty ...
5
votes
8answers
4k views

What equipment do real ISP's use? [closed]

In a dormitory of 550 residents, people often mistakenly set up DHCP servers for the whole network by plugging in their private Wi-Fi routers wrongly. Also recently, someone mistakenly configured ...
3
votes
0answers
62 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 ...
0
votes
0answers
87 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: ...
1
vote
1answer
538 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
votes
1answer
49 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 ...
9
votes
2answers
7k views

Is my Cisco switch port bad?

I've been chasing a packet-loss and network stability issue for a handful of end-users on an internal network for the past few days... These issues surfaced last week, however the location was struck ...
9
votes
1answer
1k views

Proper method for connecting multiple non-stackable network switches?

I deal with many clients in warehousing and industrial applications who have IT staff or local consultants. Many of these sites are still using a 10/100 Megabit switching backbone... I've managed to ...
5
votes
2answers
5k 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 ...
1
vote
1answer
64 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 ...
1
vote
7answers
14k views

What is the best way to connect 3 switches with a router?

I'm trying to rebuild the network from my work and I was thinking what is the best way to connect three switches and a router. The router has 4 ports so I thought to connect 2 switches to the router ...
13
votes
4answers
12k views