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Check if ntuple filters are enabled with ethtool -k. Enable ntuple filters with ethtool -K.

Using the Linux ss command to examine network and socket connections

Check existing ntuple filters with ethtool -u. Note: monitoring hardware IRQs does not give a complete picture of packet processing health. It is one important part of your whole monitoring solution. Get the current IRQ coalescing settings with ethtool -c. Reminder that your hardware and driver may only support a subset of the options listed above.


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You should consult your driver source code and your hardware data sheet for more information on supported coalescing options. Note: while interrupt coalescing seems to be a very useful optimization at first glance, the rest of the networking stack internals also come into the fold when attempting to optimize. Interrupt coalescing can be useful in some cases, but you should ensure that the rest of your networking stack is also tuned properly. Simply modifying your coalescing settings alone will likely provide minimal benefit in and of itself.


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Note: the CPU will still be bounded by a time limit of 2 jiffies , regardless of the assigned budget. Example: set the overall packet processing budget to Use ethtool -k to check your GRO settings. Use ethtool -K to enable or disable GRO. You can compare before and after of your softirq and CPU usage graphs to confirm that RPS is configured properly to your liking. I'm a huge fan of Agatha Christie's work. Exclusive bonus: Download Linux networking command cheatsheet for future reference. You can print it or save it for offline viewing.

Linux Basic Networking Commands

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The other two qdiscs are connected to each other.

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In a nutshell, htb allows limiting the traffic speed, while sfq tries to evenly redistribute outgoing packets. Well, libvirt hid once more the part of Linux which is highly useful as well as difficult. It allowed us to configure Linux packet scheduler for the virtual machine tap interface in just several clear XML lines. To do that you need the second interface, which is easy to add using virsh:. You can make sure that the first interface still exists either by looking at the virtual machine XML file or running ip addr there.

You can also run the same command on host with the new tap interface. Install teamd: yum install teamd NetworkManager-team -y. Load the module: modprobe team. ObjectManager" doesn't exist. Now we have the team interface with a real interface and an IP address. You also need to delete all the configured connections from the interfaces you plan to team.

How to setup firewall in Linux? - GeeksforGeeks

Add the second interface:. You also need to pay attention to the fact that all three interfaces now have the same MAC address by default. Teaming support several modes of working called runners. The simplest is roundrobin.

Network Diagnostics Background

As you can see from its name, all the interfaces where the packets are transmitted to will be processed in circular order. Another example is, activebackup , it uses only one interface and if it stops working, the traffic will be routed through the next available one.

If you need to know all available choices, you need man teamd. The aim here is to configure activebackup with the new interface as the main one and the slow one its speed was limited with tc as a backup one.

After that you need to start downloading a large file in the virtual machine and disconnect the new fast interface from the server. You can just search through the local documentation and find highly detailed descriptions with lots of examples! Another example of configuration you can find in man teamd. Here we set an activebackup mode and make ens9 interface the fastest our primary one. You need o make sure that all the configurations were applied with teamdctl team0 state :. The thing is that the config can be loaded only during creating of a team interface.

In this video we log on to the virtual machine and start downloading a file in a separate session and then disconnect the main interface using virsh. There are some things that you always need to keep in mind:. Before we started writing this article we planned it as a short one about teaming in Linux only.

List of basic networking commands in Linux

Once we started we realized that there are many things that need to be discussed as well. We examined Linux Traffic Control, which means that now we know way more about Linux networking stack. Now, in theory, we can build sophisticated traffic processing sequences using tc. We also got the gist of teaming and saw for ourselves how effective it is. We were playing around with libvirt and now we know how much it helps at work.

A couple of lines of XML configuration file hide complex and flexible settings for several built-in Linux instruments which can be used on different Layers.

All those instruments make virtualization possible, which is needed for work with all present cloud platforms. We read hundreds of articles, docs and parts of the books while preparing for writing. Below you can find some links for further reading with more detailed information:. We write about how to become a better developer and how to maintain and apply your skills.

Morgan Kaufmann Linux Networking Clearly Explained 2013 RETAiL EBOOk REPACK:

We also publish job offers and exclusive promos for more than subscribers. Join us! What do you need teaming, bonding, link aggregation and port trunking for? Checking if teaming is working properly Well, now you know what teaming is for.