Brocade VCS fabric has one of the most flexible multichassis link aggregation group (LAG) implementation – you can terminate member links of an individual LAG on any four switches in the VCS fabric. Using that flexibility is not always a good idea.
2015-01-23: Added a few caveats on load distribution
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We’ve talked about docker in a few of my more recent posts but we haven’t really tackled how docker does networking. We know that docker can expose container services through port mapping, but that brings some interesting challenges along with it.
As with anything related to networking, our first challenge is to understand the basics. Moreover, to understand what our connectivity options are for the devices we want to connect to the network (docker(containers)). So the goal of this post is going to be to review docker networking defaults. Once we know what our host connectivity options are, we can spread quickly into advanced container networking.
So let’s start with the basics. In this post, I’m going to be working with two docker hosts, docker1 and docker2. They sit on the network like this…
So nothing too complicated here. Two basic hosts with a very basic network configuration. So let’s assume that you’ve installed docker and are running with a default configuration. If you need instructions for the install see this. At this point, all I’ve done is configured a static IP on each host, configured a Continue reading
A couple of weeks ago, a CLN Member Posted a question with the heading Does ASA drop active session.
The specific question was as follows–
I have a time based ACL configured on a Cisco ASA. I need to know if the active sessions are dropped by the ASA when the time limit is over.
For example, users are allowed to connect between 12 and 1 PM. If there are any active connections just before 1 PM then will they be dropped at 1 PM?
Many network and security administrators would blindly assume that a time-based ACL would block or allow traffic based on the time-range attached to the individual ACE. Having quite a lot of experience with the ASA, I was skeptical and assumed that any ongoing connections would continue to allow the flow of traffic. I decided to do a little testing and here is what I found.
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When I was in the USAF, a long, long, time ago, there was a guy in my shop — Armand — who, no matter what we did around the shop, would ask, “but does it work?” For instance, when I was working on redoing the tool cabinet, with nice painted slots for each tool, he walked by — “Nice. But does it work?” I remember showing him where each tool fit, and how it would all be organized so we the pager went off at 2AM because the localizer was down (yet again), it would be easy to find that one tool you needed to fix the problem. He just shook his head and walked away. Again, later, I was working on the status board in the Group Readiness Center — the big white metal board that showed the current status of every piece of comm equipment on the Base — Armand walked by and said, “looks nice, but does it work?” Again, I showed him how the new arrangement was better than the old one. And again Armand just shook his head and walked away. It took me a long time to “get it” — to Continue reading
Every time I write about unequal traffic distribution across a link aggregation group (LAG, aka Etherchannel or Port Channel) or ECMP fabric, someone asks a simple question “is there no way to reshuffle the traffic to make it more balanced?”
TL&DR summary: there are ways to do it, and some vendors already implemented them.
Read more ...This sponsored podcast is another in our series of recordings made at HP Discover 2014 in Barcelona, Spain. Once again, our special thanks to Chris Young for bringing us technical guests and not just fluffy marketing folks. Technical Marketing Engineer at HP Networking Yarnin Israel and Senior Research Scientist at HP Labs Souvik Sen join Packet […]
The post PQ Show 42 – HP Networking – Location Aware Wireless appeared first on Packet Pushers Podcast and was written by Ethan Banks.
The tutorial explains how to set up pfSense VirtualBox appliance in order to use it as a personal firewall on Linux. It shows Linux network configuration to support this scenario and provides an installation script that automatically builds a VirtualBox virtual machine ready for pfSense installation. It also describes pfSense installation and shows minimal web configuration needed for successful connection to the Internet.
pfSense Live CD ISO disk can be downloaded from here.
1. Linux Network Configuration
We are going to install pfSsense from live CD ISO image on a VirtualBox virtual machine. To do so we must reconfigure an existing network interface, create a new one and configure new static default routes. A network topology consists of Linux Fedora with installed VirtualBox virtualizer. is shown below.
Picture 1 - Network Topology
A wireless network card is installed in Linux and presented as an interface wlp3s0. The interface wlp3s0 is the interface that connects Pfsense virtual machine to the outside world. This interface will be bridged with a first network adapter (em0) of the Pfsense virtual machine. Bridging host adapter wlp3s0 with the guest adapter em0 (WAN interface of Pfsense) will be done using vboxmanage utility and shown later in the tutorial.
As the Pfsense appliance is Continue reading
Welcome to my new home! If you’ve come over here because you used to read my drivel on LameJournal, then thank you! If you’re a new visitor, you are very welcome and I hope you choose to subscribe by RSS or Email so you can get notified of new posts.
MovingPackets.net is the new name for LameJournal. All the networking and computer-related content from LameJournal has been duplicated here at MovingPackets, but the photography content is gone and I’ll attempt to stay focused on things related to moving packets around as I post here going forward.
I have a new site theme, and with the new name as well, things are still likely to change a bit here visually (I have no logo yet for example). Still, there’s no time like the present so I decided to launch the site and I’ll tweak things as we go along with the aim of making the content more easily accessible. I hope you like my new home; it’s going to take a while before it feels comfortable!
Thanks for stopping in at MovingPackets.
John.
If you liked this post, please do click through to the source at Welcome to MovingPackets.NET! and give me a share/like. Thank you!
I’ve been quiet lately, mostly because I’ve been horribly busy but also in part because I’ve been thinking that it’s about time to rebrand LameJournal to something that better reflects the content. And to that end, MovingPackets.net has been born. All the … Continue reading
If you liked this post, please do click through to the source at MovingPackets.NET – The New Name for LameJournal and give me a share/like. Thank you!
