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30

No all 127.0.0.1 traffic never hits the physical network, it gets processed by a loop back adapter in the kernel.


24

Yes, it can be done in Windows: Go to the Control Panel > Network Connections Right click on the Local Area Connection (or whichever network connection you want to add the 2nd IP Address) and click Properties Click on Internet Protocol (TCP/IP) in the connection box and click properties Enter the first IP address in the properties box Click Advanced Click ...


19

You don't mention a particular OS but for most all that happens is that the data travels down the stack until it gets to IP at which point it's pretty much sent back. That's a massive oversimplification but means that the entire process is usually CPU bound so its performance is therefore directly linked to CPU speed plus stack efficiency. In practical terms ...


19

Is ethtool what you're looking for ethtool --identify eth0


19

Yeah it was ethtool I was looking for but specifically this will flash the link light for two minutes: ethtool -p eth0 120


18

(2a). Load balancing. (3). Separation of traffic (i.e. you could have a combo web/database server, same network, put all web traffic on one NIC, db traffic on the other, makes it easier to calculate loads for traffic types). This also makes it easier to split the two later on, nobody has to change connection strings.


14

A separate network for backups. A separate network for console access (these are typically now integrated on the system board for mainstream servers). Increased throughput (multiple GB networks) bonded together.


13

What should be: The PCIe spec states that all slots start at 1x/v1.0 and negotiate how many lanes they can use and what clock speed. It shouldn't matter which supports more lanes/clock, some slots are designed to take larger cards and smaller cards fit in larger slots. Whatever the highest spec both sides can communicate at (both the number of lanes and the ...


12

They probably mean your MAC address. (The hexidecimal string under the Physical Address column of getmac. - Either D4-BE-D9-1C-4F-C7, 24-77-03-3E-B2-9C, 7C-E9-D3-FE-40-41, or 24-77-03-3E-B2-9D, depending on which is your NIC/the Network interface this license will be run against. Most likely D4-BE-D9-1C-4F-C7.) Certainty will require asking whomever it is ...


12

You're not going to want to do this with direct manipulation of the registry. You're much better off using the netsh command to make these kinds of changes. Assuming the NIC is named "Local Area Connection", you can do netsh interface ip "Local Area Connection" x.x.x.x y.y.y.y where x.x.x.x is the IP address and y.y.y.y is the subnet mask.


11

Bonding is not applicable for this case. For your solution: You will find some useful notes at Increasing bandwidth with multiple NICs. For Bonding: You can start at the Wikipedia Link Aggregation and related Channel bonding pages for initial reading on bonding.


11

Wait - you're asking for server grade NICs but want to buy a 350 bucks switch?! I don't get that ... Usually "server grade" 48 port GigE switches go for somewhere around 3000-5000 USD list price. Maybe you want to look out for switch side things like stacking for cross-stack LACP. Regarding the NIC, things like: proper DMA interface and good drivers that ...


10

Edit /etc/network/interface and remove all but one of the gateway statements.


10

It's bollocks. If you take a strike on a network cable, it'll go right through the card and into the PCI bus, which will make your system just as dead as if you'd had the NIC built-in.


10

For that I am planning to use an old Pentium 3 machine. Since you are using an older machine, I suspect I would go with whatever is inexpensive. Does your computer have a 64 bit PCI-X slot? Most of the 4 port PCI interfaces I have seen prefer one? Since you are already choosing to use an older machine, I am not sure you will really see much ...


10

VMware is a company, not a product. I'll assume that you're referring to vSphere, based on the link you posted in your question. Yes it is possible to use only one pNIC. In this case you would have a Virtual Machine port group and a VMkernel port on the same vSwitch.


10

A "default" gateway is just one that is used when there isn't a more specific route defined. You don't want to have a default route on two different interfaces (unless you're doing it for redundancy). What you want is to have a default route on your "main" interface that most of the traffic uses and then you want to create a persistent static route for each ...


10

If your NICs have the same MAC addresses, you should stop fiddling around with workarounds and return them to the manufacturer as defective. Get proper replacements and continue on as normal. Incur the downtime once instead of the recurring issues that will pop up from continuing to hack together a "solution."


10

Yes, they're completely hot-swappable. Think of them the same way as cables (note the link lights). Same for SFP+ direct-attach cables. It wouldn't make sense for them not to be hot-swappable. Heck, most network switches don't even have power switches :)


9

Virtualization. 6 is the least I'd want on a ESXi host, especially if you're using iSCSI. 2 for storage 2 for management/vMotion 2 for data Or if you don't use iSCSI, you can separate management and vMotion traffic.


9

The main principle behind interrupt moderation is to generate less than one interrupt per received frame (or one interrupt per transmit frame completion), reducing the OS overhead encountered when servicing interrupts. The BCM5709 controller supports a couple of methods in hardware for coalescing interrupts, including: Generate an interrupt after ...


9

Sure, you simply have to enable vlan tagging on the switch and the network adapter and setup both sides with all the vlans you want the computer to see. The details about how to configure vlan trunking vary depending on what OS, and what you have to do for a specific nic or switch. Keep in mind that this may be a bit of a security issue. Suppose this is ...


9

Yes. Not an answer to your question, but something I didn't believe until I had seen it with my own eyes, it is sometimes possible to take a hacksaw to a PCIe x16 card and cut the connector down to fit into a PCIe x4 slot. "Why on earth would you want to do that?" is the obvious question. Well we inherited half a dozen Poweredge 440s that we wanted to use ...


9

"Bonding" (teaming, trunking, or a host of other terms) NICs is used to increase bandwidth into a switch, or for redundancy for LAN connections. Redundancy and/or bandwidth expansion for WAN connections (like, to the Internet) is accomplished with routing protocols (typically BGP). Bonding the NICs together on a server computer isn't going to accomplish ...


8

There's always more than one way to do anything :) Solution 1 Motherboards with one of each? Blacklist whichever module (ethtool -i eth0) is supporting the Realtek card. Ubuntu supports module_name.blacklist=yes to blacklist it at boot and you should be able to change the modprobe options in the preseed environment so that it doesn't get probed later. ...


7

Speed is not that essential as many think. I had a server that had many drops (ingoing and outgoing) - but every tool only showed low bandwidth utilization (on a gigabit link, less than 2% average). Nevertheless the statistic counters showed dropped tx and rx on the server. An analysis of the ip-packets showed that the server is being flooded by thousands ...


7

They maintain archives of the package repositories for EOL software at http://old-releases.ubuntu.com You just need to change your deb and possibly deb-src lines in /etc/apt/sources.list file from the (likly) current lines that look like http://us.archive.ubuntu.com/ubuntu to http://old-releases.ubuntu.com/ubuntu/ and you should be able to pull the old ...


7

You may be interested in the Loopback Fast Path feature we added in Windows 8 and Windows Server 2012. I've written a short blog about it here http://blogs.technet.com/b/wincat/archive/2012/12/05/fast-tcp-loopback-performance-and-low-latency-with-windows-server-2012-tcp-loopback-fast-path.aspx It also provides an illustration of the path taken by the ...


7

Duplex is a bit of a misnomer in Gigabit Ethernet as there are not separate send and receive channels like in 10Mb or 100Mb Ethernet. In the lower speeds 2 wires are used to send, and 2 to receive. The other 4 wires aren't used at all (for data anyway). In Gigabit Ethernet all 4 pairs are used to send and receive. It uses a 2 of 5 trellis coding: For ...


7

Connect the two hosts with an Ethernet crossover cable.



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