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

learn more… | top users | synonyms (1)

0
votes
1answer
59 views

How best to setup for high traffic due to thin clients

I develop a client/server software system that is designed to display images to the photographer's customers. A LOT of my customers are using thin clients for the viewing stations, the NComputing ...
1
vote
0answers
150 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 ...
2
votes
1answer
130 views

What could be wrong with my VLAN?

I've got a VLAN 10 setup as a management VLAN. The management VLAN comes off port 48 and links to another set of switches that do not support VLAN's so it was I believe set up as an untagged access ...
0
votes
2answers
40 views

switch duplicates packets and forward in two route

there is a network including a router, two hosts and a switch which connects hosts to router. i have a virtual machine on my system. the network adapter is set to act as bridge. so the virtual machine ...
0
votes
1answer
66 views

Only one server behind a switch cannot access the internet and vice versa

I have multiple servers deployed behind a single switch. All the servers have their own public IP addresses. Suddenly one of them (say A) cannot be accessed from the outside by any means, e.g. HTTP, ...
0
votes
1answer
112 views

can network Redundancy possible with help of Layer 2 switches & dual NIC in one PC & program in java?

I am Trying to achieve Network Redundancy in network which have 1 server & lots of node which use 1 switch for each. As per various forums for achieve Redundancy in network i should use Layer 3 ...
1
vote
0answers
51 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 ...
0
votes
1answer
303 views

UDP packet loss on Netgear GS110TP

I'm trying to flow data via UDP on two ports of a Netgear GS110TP switch, running the latest available firmware (5.4.2.9). However, I'm experiencing a small amount of packet loss, something like ...
0
votes
1answer
91 views

Private DHCP through a switch using two eth interfaces?

Right now, I have an Scientific Linux blade connected to the internet on eth3, and connected to a 48 port Cisco switch on eth2. This Cisco switch is connected to the eth2 of 24 blank blades (which are ...
-2
votes
3answers
70 views

can power on ethernet for one poe swtich to another layer 2/3 switch?

My question is 1. can we use 1 poe switch as power supply for another layer 2/3 switch? 2. If question 1's answer is yes then What should be maximum distance between those? As per my reading in ...
1
vote
2answers
230 views

How to add multiple IPv4 Subnets to a VLAN using Allied Telesyn at9924 Switch?

I cannot figure out adding more than one IPv4 subnets on a VLAN using Allied Telesyn at9924 Switch I've added the first IP using this command: add ip int=vlan15 ip=xxx.243.117.193 ...
-2
votes
1answer
77 views

Why do collision may occur if there is duplex mismatch?

In a question on Serverfault It is mentioned that " it is possible for a single host connected to one port to experience collisions if there's a duplex mismatch between the host NIC and the switch ...
1
vote
3answers
165 views

Cisco Switch Out-Of-Box without console access

I have a Cisco C2950-24 Switch Out-Of-Box here. But my laptop doesn't have serial port nor I have the console hub. Is there a way to setup the switch from this state without console access? I have ...
0
votes
1answer
365 views

Cant Connect/Ping to Management Console on Cisco SG200-50 after Connecting networking

I have two of these switches. When I have nothing else plugged in and a cable from port 1 to a laptop on the same subnet I can connect fine, however after plugging any additional networking in I ...
-2
votes
1answer
24 views

Uninstalled server 2008 now router won't handle DHCP

My set up is this. server behind router, router has a server and switch connected to it with multiple computers. router used to serve DHCP and DNS, a couple of days ago installed AD, DNS and DHCP on ...
0
votes
1answer
47 views

Move single ip address accross network or virtual machines

I'm currently trying to set up a small development cluster inside our enterprise network. We have a system to provision "disposable" virtual machines and move them to any of our 12 servers if needed. ...
4
votes
1answer
424 views

HP Procurve 2512/2524 protected port, source port filter or similar?

HP Procurve switches usually have a setting so that the ports are told which other ports they can communicate with. An easy setup using this is to only allow communication with the uplink, so that no ...
0
votes
1answer
57 views

Which would be the best switch for a cloud cluster? [closed]

I am about to set up a private cloud using Eucalyputs on CentOS, and I am confused about buying a network switch. Right now there will be 4 node controllers on my cloud, but in the near future I am ...
0
votes
0answers
226 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 ...
1
vote
1answer
63 views

Monitoring bandwidth on a layer-3 invisible switch [closed]

Our servers are distributed to 2 racks in a datacenter, each rack having its own switch. The communication between the racks are made by the link between these two switches. The bandwidth between ...
2
votes
1answer
469 views

switch, procuve 2510, error: OS TFTP in prgrs, SNMP denied

I cannot reboot 2510-24 then I get this message: OS TFTP in prgrs, SNMP denied Smart as I am I just started a new TFTP download of latest firmware, but that is a no-go since another download is in ...
0
votes
0answers
343 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 ...
1
vote
0answers
114 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 ...
-2
votes
3answers
124 views

Cisco switch inter-vlan access

I have Cisco Catalyst 2960-s switch and I want to configure three Vlans (A; B; C) I want to : Allow traffic between A and B Allow traffic between A and C Block traffic between C and B or if ...
2
votes
3answers
124 views

ESXi 5x cluster Hardware Failure Scenario

Hello fellas engineers. I have a ESXi5.0 cluster setup with 3 ESXi hosts. Now I need to create a test case for networking hardware failure and preform the test in the datacenter. My Setup: 1) 3 ...
-1
votes
1answer
62 views

Write operation is happening from 1 Gigabit port instead of 10 Gigabit port in NetGear switch and its random [closed]

We have a Synology system which is connected with NetGear switch. We passed 2, 10 gigabit cables from synology to switch. We connected HP server with switch with 2, 10 gigabit port. We connected one ...
2
votes
1answer
607 views

How is my newer Cisco Switch finding the default gateway?

Is there something new that I do not know about with newer Cisco gear. In order to manage my switch I usually have to assign a VLAN 1 interface and add a default route (or ip default-gateway) to ...
0
votes
1answer
176 views

route cisco sg300 traffic through Watchguard firewall

I need help in determining what I need to research. I have two cisco SG300 switches (sg300-52 & sg300-28) and a Watchguard firewall (XTM-23). The internet connection currently passes through our ...
0
votes
3answers
313 views

patch panels… or directly to the switch?

does it make a difference in terms of signal quality if I connect the Ethernet cabling: from the wall-plugs to the patch-panel and from the patch-panel to the switch with a cord. as opposed to: ...
2
votes
1answer
305 views

How can I stress an Ethernet managed Switch?

for testing purposes I need to stress an 8-port managed ethernet switch. Essentially, I want to simulate a scenario in which two hosts on the switch are exchanging data and the other hosts connected ...
1
vote
2answers
77 views

Access switch management on network without dhcp

Could not find default IP of cisco router which was static. Issue is now solved see answer below :)
10
votes
7answers
779 views

What's a good way to handle multiple devices with the same MAC address on one network?

The devices I'm working with come off the production line all set to the same MAC address. I can set each one to have their own static IP, and I'm wondering if there would be a way to connect them to ...
1
vote
1answer
79 views

What is a “dual-central switch”?

In the following description, it states to use a switch that has uplinks to dual-central switches. What is a "dual-central switch"? From the book Hadoop in Practice, by Alex Holmes.
1
vote
0answers
67 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 ...
0
votes
3answers
68 views

Need to add a 3rd switch to dual network structure (2 routers & 2 switches)

We currently have 2 networks utilising the same 2 switches (so a computer attached to either switch can connect to either network), and we need to add in a 3rd switch but we’re not sure exactly how to ...
0
votes
1answer
88 views

Separate static ip's from one port on modem with smart switch

I have a network where our service provider gave us one port on our modem that has static ip's. Was confused on how to separate these ip's. I was going to use a smart switch with vlan as such: vlan 1 ...
5
votes
1answer
122 views

Route traffic directly between nodes in a cluster

I apologize if this is a really dumb question. Objective Ensure that traffic that is meant to go between nodes in a cluster does not (inefficiently) go outside the cluster and then come back in, but ...
2
votes
3answers
1k views

VLANs using one managed switch or link router to unmanaged switches?

I'm the resident IT guy in an office with about 20 workers, amongst 3 separate companies who sublet an office. We are wired with 24 ethernet ports dotted around the offices that all lead to a patch ...
0
votes
0answers
100 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 ...
1
vote
1answer
981 views

Cisco Port Buffer Memory

How can the total amount of port buffer memory be determined for Cisco switches? Cisco doesn't seem to publish this data anywhere as part of the hardware specifications, but the information seems ...
1
vote
0answers
195 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 ...
1
vote
1answer
183 views

Maximum throughput on switch with different link speeds

While doing some benchmarking on a network app I discovered strange behavior that involves 100MBit and 1GBit ethernet clients connected through a switch (at-gs900/8e). I have one server (Gbit) and ...
2
votes
0answers
238 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 ...
7
votes
1answer
697 views

Are network switch data transfer speed limits per port or per device?

Sorry in advance for the newbie question! When network switches report speeds of say 100 Mbit or 1 Gbit, are they referring to the maximum speed per Ethernet port or is this the physical limit of the ...
2
votes
3answers
113 views

Network Switch for Web Application

I'm migrating a web application from a single server to a three server config, two running the database and one the web tier. I need to purchase a network switch to string these servers together ...
-1
votes
1answer
352 views

Getting packets from one port to another on a Dell PowerConnect 2824 switch

I have a dell PowerConnect 2824 and I have a cat 5 cable connected from port 1 to port 23. Port 1 is reserved for VLAN 1 (the only VLAN that can manage the switch) and port 18-23 belong to VLAN 112. ...
2
votes
1answer
332 views

Spanning-tree setup with incompatible switches

I have a set of eight HP ProCurve 2910al-48G Ethernet switches at my datacenter that are set up in a star topology with no physical loops. I want to partially mesh the switches for redundancy and ...
4
votes
2answers
106 views

Appropriate Network switch for small server cluster

Need to build a small business server cluster for the purpose of crunching data. It will not host a web site that needs to be available 24/7. It does need to support servers that host Redis, a ...
1
vote
2answers
813 views

Having two IP Routes/Gateways of last Resort on an HP Switch

We have an HP Layer 3 Switch that is doing IP routing between vlans. The general set up is that the switch has an IP address on each VLAN and IP routing is enabled. On our servers VLAN, we have a ...
3
votes
1answer
158 views

Unicast traffic between hosts on a switch leaving the switch by its uplink. Why?

I have a weird thing happening on our network at my office which I can't quite get my head around. In particular I can't tell if it's a problem with a switch, or a problem with configuration. We have ...