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

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58 views

How to fix an aborted firmware upgrade on Cisco SLM2048

There is a Cisco SLM2048 switch and the last firmware upgrade aborted, now the switch doesn't work anymore. I can't access the switch. The only evidence is a blinking system LED. As the switch doesn't ...
2
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0answers
153 views

Drop Events on a Dell Powerswitch 2724

I have a rather simple network setup here at an office. We utilize a Sonicwall TZ205N, plugged into a Business-Class Cable modem for internet, and plugged into three Dell PowerConnect 2724 gigabit ...
2
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0answers
437 views

Issues connecting to HP ProCurve switches

We are having a very strange issue trying to connect to our infrastructure switches via SSH. When you first try connecting to them, the switches will prompt for the password - and then just sit there ...
2
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0answers
478 views

Configure vlan on Netgear switch via SNMP

I am trying to configure vlans on a netgear GS752TSX from the Linux command line with netsnmp. I have created vlan 99 on the web interface now want to control the pvid settings, egress and tagging. I ...
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0answers
221 views

Basic QoS policy for Dell 6248 switches

My cisco edge router tags all incoming packets as IP precedence 0, 3, and 5 depending on their priority. How can I add a matching QoS configuration on the switch so that packets are prioritized ...
2
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0answers
263 views

Q-BRIDGE-MIB representation of ports on Dell PowerConnect 6248

I have a Dell PowerEdge 6248 with a 2x10Gb uplink module. I'm trying to make sense of the representation of the ports from the following snmp output: Q-BRIDGE-MIB::dot1qVlanStaticUntaggedPorts.4081 = ...
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0answers
416 views

Port mirroring on Cisco switches

I have a Cisco Catalyst 3750X switch, and I have configured port mirroring on it. Traffic from 12 of the 1G ports will be mirrored to both 10G ports, and I have connected both 10G ports to a server ...
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0answers
24 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 ...
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72 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 ...
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88 views

Inter-server connectivity loss after applying cisco switch configurations

I have 2 Redhat servers in cluster. The eth0/eth2 ports on both servers are in bond0(which is assigned IP). The eth0 and eth2 from server1 are physically connected to giE0/3 on switch1 and 2 ...
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86 views

Routing between L2 isolated ports

I am to deploy some managed switches for FTTB/FTTH and preparing configuration to introduce isolation between customers (by disabling L2 forwarding between client ports or using private VLANs). ...
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0answers
101 views

why do I lose ping to a machine when using port mirroring / monitoring (sniffing)?

I am using port mirroring / monitoring in my 3COM layer 3 switches to look at network traffic (using wireshark). Sometimes, I have found that I loose connectivity with the remote monitor machine ...
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0answers
33 views

Juniper 802.3ad Link between Switch and Router 3x link issue

We have a live 20Gbps link between our switch and router and we are trying to add another 10Gbps link to the LAG, we've changed all the settings on both end to add the third interface to the LAG yet ...
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0answers
87 views

Cisco Auto Smartports on catalyst 2960-s

I have Cisco Catalyst 2960-s, I want to configure user defined macros on it. I searched a lot in Cisco documentation but its not for beginners :( How to create a user defined macro that runs when a ...
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0answers
51 views

IGMP 2.0 snooping switch timeout

Suppose a host computer has joined a multicast group 239.0.0.50 via IGMP 2.0. As per the IGMP 2.0 spec, when the host computer receives either a general query on 224.0.0.1 or a group wide query on ...
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0answers
128 views

Dell PowerConnect SNMP stack member monitoring

I am looking to monitor a stack of Dell PowerConnect 6248p switches via SNMP. There is a stack of 3 switches that I want to monitor. Due to the stack being 1 logical unit it only has 1 IP, so when ...
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0answers
90 views

Is the Foundry BR-FGS624P switch stackable by adding the 10GbE ports, or is it never stackable?

I'm looking at buying a Foundary BR-FGS624P 24 port switch which will suit our purposes now, but thinking into the future I might like to stack the switch when we add a few more servers to our rack. ...
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0answers
311 views

TP-LINK to HP switch connectivity issue

I have purchased 2 TP-LINK SG3424P switches to power PoE access points. Half of them are connected to one TP-LINK switch that is then connected through a trunk port to a Cisco 3560X and the other half ...
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0answers
164 views

stop arp poisoning on a 5448 powerconnect switch

We have to disable arp poisoning on our dell 5448 switch. Right now it has all our production machines running on it and I'm not a networking guy at all so I don't want to run a command that will ...
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0answers
1k views

Is it possible to mix jumbo frames VLAN and standard mtu VLAN on the same switch port?

If a managed switch and all attached devices both support VLANs and Jumbo Frames, is it possible to mix VLANs with jumbo frames and VLANs with standard frames on the same switch port / ethernet card? ...
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0answers
121 views

How can I use multiple NICs on Windows Server 2008 function as a switch

I have a win2008 Server with 4 network ports (A,B,C and D) where only 1 port A is connected to the LAN (192.168.0.0/24). The other 3 ports (B,C and D) are not in use. I have another PC want to join ...
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521 views

HP E3800 switch to switch LACP connection dropping

I have a problem with 2 sets of stacked (2 switches in each stack) HP E3800 48 port switches. One set of stacked switches per rack for a total of 4 switches. I have a 4 port static LACP connection ...
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973 views

Ping starts, then immediately fails, to just one device on a network of 70+ and only from one part of the network! Super confusing

long-time reader first-time poster. I managed a network of 70 odd PCs connected to 3x different network switches (3 buildings all next door to each other). Looks like this: BUILDING 1 SWITCH -> ...
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223 views

Cisco 2950 Express Setup

I've been donated a Cisco Catalyst 2950 Switch by the company I work for to have a play with. I've reset it back to Factory Defaults, but having an issue with getting to Express Setup. I've followed ...
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234 views

Dell PowerConnect 5448 QoS policy based on TCP port specification?

I am working with a set of Dell PowerConnect 5448 switches where I'm trying to prioritize traffic for specific TCP ports/services. In this case, it's a production warehouse printing environment, and ...
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133 views

Duplicate packets on network after disconnecting wireless access point on separate VLAN

We have a network with a few switches. One of these is a 3com 4500, where there are many computers connected, a custom linux firewall and a wireless bridge. The port where the wireless bridge and the ...
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752 views

Using Plink to script commands to Dell PowerConnect 6224

I'm trying to setup a simple script to update the configuration on a Dell PowerConnect 6224. I have SSH setup and working and can connect to the switch using either Putty or PLink but when I use ...
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25 views

Access switch on the LAN from a WLAN connection Sonicwall TZ205

I have a setup like the following Modem >>> Sonicwall TZ205 >>>> Linksys 8 port smart POE switch >>>> Linksys LRT224 When I am on the LAN through a wired connection ...
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25 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 ...
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0answers
40 views

Configuring a RADIUS server 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 ...
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0answers
6 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 ...
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43 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 ...
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37 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 ...
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0answers
38 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 ...
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0answers
49 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 ...
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0answers
36 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 ...
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0answers
53 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 ...
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0answers
40 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 ...
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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 ...
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0answers
72 views

dlink arp spoofing prevention

Can someone can help me understanding arp spoofing prevention on Dlink dgs-3100. I'd like to protect my gateway MAC/IP from spoofing so I have tried to add a rule "IP: 192.168.1.1 MAC: ...
0
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0answers
152 views

Computers Suddenly Lost Connection to SBS 2008 Server

I am having an issue that I could not explain myself in the entire of my career. The issue is when the entire computers just randomly and suddenly lost connection to the server, running Windows Server ...
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0answers
219 views

LACP on HP Procurve 2848

We're currently running 2 x Uplinks to our ISP, in a LACP Trunk, and although the inbound is being balance properly, the outbound is only going through 1 link. I've been told that this HP Switch ...
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0answers
89 views

KVM directly connect to guests without passing router

I have a KVM host running 5 virtual servers. Each virtual server is using a separate bridge interface, like br0, br1, br3... Each virtual server has a own public IP. Now, I would like to be able to ...
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0answers
88 views

Dell Switch acl to only allow port 80 and 443 to vlan

I'm not a network administrator, just wondering if the following acl is correct? or seems like it is correct. ACL only allow 10.0.0.0/24 to talk to 172.18.19.0/24 on port 443 configure ACL on ...
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126 views

Dell PowerConnect 6248 10GB Modules

Does anyone know if the dual 10GB BaseT module ports fitted in a Dell PowerConnect 6248 switch can be used to connect to an ISCSI SAN rather then up linking between switches?
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488 views

Does anyone know how to configure a 3Com 4210 switch?

Does anyone know how to configure a 3Com 4210 ? I think I have managed to do a factory reset (Control-B at console prompt on boot and choosing to ignore startup file). The switch does not get an IP ...
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0answers
79 views

I have a firewall that supports 1Gbit ethernet ports but 1.4Gbit of traffic, can I make use of a 10Gbit pipe from the router in this case?

We're putting up a rack of servers in a datacenter which provides us either a 1Gbit pipe or 10Gbit pipe from the router (our choice, our package includes 10Gbit). But if we have a firewall which ...
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0answers
91 views

Routing traffic externally instead of internal loop

I have one Ubuntu box with 2 network cards. I am running netperf on the computer to measure performance of networking equipment, ethernet coming out of eth0 into the switch then back out into the ...
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0answers
212 views

IBM Bladecenter Nortel switch issue

We have a IBM Bladecenter with integrated Nortel switch. The problem is I am not able to change anything on the switch because I am getting the following errors: >> azimov-in - Main# diff Diff ...
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563 views

Poor HP Procurve 2848 port performance

I have a 4 servers connected to a HP 2848 switch with uplink to a router (Linux or Cisco - doesn't matter). Total traffic is about 300Mbps with 60-70Kpps. The problem is with a a port, connected to a ...