3
votes
2answers
541 views

Are transceivers hot swappable?

Are transceivers in general hot swappable, and if not, how do I find out if these are? Using these adapters 665243-B21, HP Ethernet 10Gb 2-port 560FLR-SFP+ 665249-B21, HP Ethernet 10Gb 2-port ...
-1
votes
1answer
70 views

Difference of HP network adapter types?

HP have a special type of cards they call FlexibleLOM, and I can't figure out what the differences are of the following HP Ethernet 10Gb 2-port 530FLR-SFP+ Adapter HP Ethernet 10Gb 2-port ...
2
votes
1answer
1k views

ESXi host losing connection to vCenter

I'm having a very odd issue with a single ESXI host. I have 2 identical hosts, core i3, 6 nics, 16g ram. 4 of the nics are used for Management, vmotion, vm network, all on different vlans. They ...
0
votes
0answers
40 views

Fibre card to switch (mini-Gbic)

I have a server with a fibre card in it which I want to connect to my 24 port procurve switch. The 10G 2 port fibre card supports fiber transceivers supporting SR, LR, LRM. The switch has two ports ...
0
votes
1answer
286 views

How to see all nics in Solaris 8/9

I have a questions regarding how to see all NICS in the solaris 8/9 SPARC boxes. Even if they are active/inactive. dladm show-link command does not work. cat /etc/path_to_inst could but it's hard to ...
2
votes
1answer
116 views

How does a NIC send a hardware interrupt? [closed]

Some context. A few weeks ago, a NIC was replaced on a box without much troubleshooting to find a clear resolution to the problem. A senior administrator got into a small tiff with an entry-level ...
19
votes
4answers
872 views

What to look for in a datacentre ethernet switch

This is a Canonical Question about choosing a network switch for a datacentre When shopping for a networking switch that's going to be going into the top of a datacentre rack, what specific ...
1
vote
1answer
51 views

What difference between HP and Intel network adapter, both using an Intel controller?

For example, the network adapter HP NC360T PCI card uses the Intel 82571EB controller. So, what exactly is the difference between an Intel "fully" branded card, and a HP branded card having an Intel ...
0
votes
1answer
281 views

Dropping Packets Randomly

I have a SuperMicro Server based on the X9DR3-LN4F+ motherboard from SuperMicro. Original intentions for the system were quite different from what it has ended up serving, but that happens. It is ...
1
vote
2answers
261 views

24 Port Switch versus 4 x 8 Port Switch

While prices for switches in the end-customer sector are decreasing, I found that 24 port switches are much more expensive than multiple 8 port switches with the same speed. Are there any ...
3
votes
1answer
212 views

How to use a switch as a network tap?

I would like to tcpdump all traffic that my router does when it makes a firmware update. So I have taken a HP ProCurve 1800-8G switch and mirrored port 7 to port 8. I have connected: Internet ...
3
votes
2answers
203 views

What are cables/boxes called for listening in on a RJ45 cable?

I would like to capture the traffic from a router, so I assume there must exist a cable or hardware box with 3 RJ45 socks, where two of them are IN and OUT, and the third is for capturing device (a ...
0
votes
1answer
27 views

hosting machine capability [duplicate]

I'm curios what's the traffic a dual-socket CPU server machine can handle? Just hypothetical, does anybody have a clue what are the keystones? Is it more about hardware or connection or anything else ...
2
votes
2answers
207 views

High number of ethernet errors. Tool for testing the ethernet card?

have an Asus Sabertooth X79. I often get corrupted files. I checked the RAM, but memtest finds no errors. To avoid the possibility of disk errors, I tried copying files to tmpfs. If I copy from the ...
-1
votes
1answer
227 views

Difference between storage and operating temperatures [closed]

What is the difference between Operating temperatue & storage temperature of switch C3560E ?
-3
votes
1answer
105 views

How much RAM and CPU throughput can handle 20GE in Cloud? [closed]

We're going to build a cloud infrastructure and would like to use the HP DL160 G8 with a 20GE NIC (2x10GE LACP). How much RAM and CPU can handle this NIC? The server will have at least 2x Intel ...
7
votes
2answers
330 views

10GBASE-T shielded cable switch-to-server connection

I'm venturing for the first time into the 10 gigabit (over copper) realm. Likewise, I have never worked with shielded CAT-5/6 cables previously. From my own research, I understand the types and ...
1
vote
2answers
329 views

If I have computers linked through a switch, will they communicate directly? [closed]

If I have a network like: Group1 -> Switch -> Switch -> Server (configured as gateway by DHCP) Group2 -> Switch -----^ (Hope that makes sense...) When computers in each group send ...
42
votes
7answers
3k views

Probability of Blade Chassis Failure

In my organisation we are thinking about buying blade servers - instead of rack servers. Of course technology vendors also make them sound very nice. A concern, that I read very often in different ...
0
votes
1answer
495 views

What would cause this file transfer slowdown?

This screenshot is of me transferring a large file (a .VHD) from one logical volume (made of 2 spindles in RAID0) to another one (made of 2 spindles in RAID0) on the same physical machine. (This is ...
0
votes
1answer
52 views

Compatibility between D-Link Media Converter Chassis and TRENDnet Media Converter Chassis

I am working on an experimental networking project. This project will involve a number of twisted-pair to fiber optic media converters. Due to the number of converters we will be using, we are ...
-3
votes
2answers
68 views

How do i create a 'layer' in between my router and a user connecting to it [closed]

Like when you go to starbucks the first thing you see if you go to their wifi is "Welcome to starbucks, please accept our terms". Or also at most airports, it makes it impossible to surf until you ...
-1
votes
2answers
383 views

How to create a separated network to customers only?

I work in a company where we have a network ethernet and wi-fi, we would like to create a network where our customers could access our network but don't have access to our computer network. This ...
5
votes
1answer
256 views

Hardware/topology recommendations for low latency UDP network

I'm setting up a LAN comprised of 60 end nodes that are receiving a high volume of UPD datagrams from one master server. The server sends 60 unique datagrams every 100ms, each datagram is 64 bytes. ...
-3
votes
1answer
498 views

'Gigabit' Ethernet Port Tester? [closed]

A quick google search shows there seems to only exist handheld testers for 10/100 Ethernet ports. Any ideas why that is and where we could find one that works with a Gigabit LAN? Perhaps the 10/100 ...
1
vote
1answer
60 views

Is there a way to get an “extension board” for a Polycom IP6000 phone? [closed]

I don't see any for sale, but is there a way to get one hooked up to it? Basically, I need 15+ speed dials. Something like this would be great, but for the Polycom instead of Grandstream: ...
17
votes
2answers
4k views

What is the command to flash a NIC link light?

I remember using a command line tool to flash a NIC's link light to identify it. I can't remember for the life of me what it was.
1
vote
2answers
423 views

NSLookup very inconsistent, slow, failing. Not Hardware error or OS Error. Can't identify problem

Multiple computers inside the network run various OSes, and connect through Wi-Fi or Physical connection. My desktop runs Ubuntu 11.04 64 bit, and has consistently slow or failing NSLookups. I bought ...
2
votes
1answer
96 views

Network-capable small format display? [closed]

I am working on a project for per-station messaging and other functions in a warehouse. I don't want the cost of a full computer at each station, so I'm looking for small format hardware that I can ...
0
votes
1answer
191 views

Slow network performance when I open files from a local network server [closed]

When I try to open a file from a network share, the file takes much longer than expected to open. It will eventuallly open, but is very slow I have restared both the server and my local computer, ...
1
vote
2answers
101 views

Which tool: graph business services and their technology dependencies

I'm looking to give our company an overview of the business services that IT offers and their various dependencies. The purpose of this graph would be to show the dependencies of technology on ...
1
vote
4answers
1k views

Network card suddently doesn't answer anymore, but answers after pinging

We have a problem with the network card on a Dell Power Edge R410 with Debian 6 (squeeze). It seems that the network card went into "sleep" mode after some time. If we are connected via ssh to the ...
0
votes
1answer
201 views

CentOS can I connect mobile and remotely from a laptop using another mobile connect to ssh or ssh -x?

Case: I placed one rack mounted server which has only intra-network activity (do not require any kind of internet access just for the service). Issues: But many times it requires remote access, in ...
2
votes
3answers
166 views

What is hub and switch? Do they function same? [duplicate]

Possible Duplicate: What is the difference between a hub and a switch? I have Cisco 2900 catalyst. And i have other hardwares for networking. But what is the difference between HUB and ...
0
votes
1answer
347 views

motherboard selection for VMware ESX or Xen

any motherboards using compatile NIC chipsets for VMware ESXi4.1 or Xen 3.4? all major manufacturers ASUS, MSI, Gigabyte seem to be using either Realtek or VIA based chips for NIC which so not have ...
1
vote
2answers
224 views

cisco 6500 crash enabling netflow

i have a cisco 6503 running IOS 12.2(33)sxi5 and i'm trying to enable netflow. Following the instructions here http://www.manageengine.com/products/netflow/help/cisco-netflow/cisco-ios-netflow.html ...
2
votes
2answers
91 views

Which Windows Server

I work with a company that has an old server that uses Windows 2000. They really only use this thing as a file server / "always-on" computer. They use quickbooks enterprise, quickbooks POS, UPS, and ...
3
votes
4answers
278 views

Router recommendation to virtualize 800 IPs

I've recently been looking at getting some new load balancers for our environment as we are expecting to double our client base in the next 12 months. Currently we have 400 public IPS serving 800 ...
5
votes
4answers
1k views

What is the difference between SAN Hard Drives and Normal Hard Drives?

At work, we have decided to finally virtualize and have decided to upgrade out SAN setup with higher capacity Hard Drives. However, what exactly is the difference between Hard Drives that come ...
0
votes
3answers
295 views

1 Computer Pulls Wrong DNS Every Morning

One of my users takes his laptop home, connects to his home network fine. He brings it in every morning and since Monday - every morning it pulls the wrong DNS every time. It pulls 1 DNS: 192.168.1.1 ...
1
vote
4answers
537 views

monitor-less Linux box on my laptop screen

I have a box which I want to install linux on, but it doesn't have a monitor. Are there ways to work on this linux box through my laptop screen? I heard it's possible to work on a headless box if ...
1
vote
2answers
187 views

Internet access for a number of diffirent VLAN's

There is about 60 UTP cables coming from some different offices into a server room. Every cable could be lead to a single computer or the unmanaged network switch. I need to give them all an ...
1
vote
4answers
1k views

Cost effective way to handle high SSL traffic?

Some time in the future, I may need to build a dedicated SSL farm (as described in Making applications scalable with Load Balancing) or something similar to handle lots of SSL traffic. While it's not ...
2
votes
3answers
172 views

How do I know if an off the shelf switch is vlan capable?

I have a managed switch that handles the vlan config. VoIP phones run on one, everything else on another. I need to buy some off the shelf switches due to the difficulty of adding another drop in some ...
0
votes
2answers
760 views

Home and Small to Medium Enterprise network manufacturer choice, Netgear, Linksys or D-Link?

I am looking for an alternative to Cisco (too expensive for me !) for semi-pro utilization (at home but with advanced feature (I'm studying in IT)) and in small/medium enterprises. I think I will ...
5
votes
9answers
3k views

Why DELL PowerConnect and Juniper are so rare ? Why do enterprises stick with Cisco? [closed]

I have a little question, I'm actually studing IT in France, and when looking on alternative on the very [...] very expensive Cisco equipments, I've found Juniper and DELL PowerConnect pretty ...
2
votes
3answers
207 views

Software for network hardware asset management, quite big problem!

Not an issue for a small network, but becomes a pain when it grows. How can I track what ever happens to my network's hardware (repairs, upgrades, whatever) if I don't want to dig into loads of Excel ...
5
votes
3answers
4k views

Kernel Log “TCP: Treason uncloaked!”

On one linux server (Gentoo hardened), we are experiencing bursts of the following messages in dmesg from time to time: TCP: Treason uncloaked! Peer xx.xx.xxx.xxx:65039/80 shrinks window ...
2
votes
1answer
339 views

Need a dumb switch or a smart hub

So here is my goal. I have a number of interfaces that I want to use to playback recorded traffic. I also have a number of interfaces that I want to use the listen to the recorded traffic. I'd like ...
0
votes
5answers
449 views

What do I need to transform my network from Ethernet to WiFi?

I'd like to know what is the best Hardware to install/buy to transform the whole network of my company from Ethernet to WiFi (keeping Ethernet for security first...). There are 2 servers and 12 ...