In one of my rants, I asked people to kindly stop with the "All Network Guys will Need to be Programmers" FUD. My recommendation was basically for Networkers to be open to change, and to start broadening their horizons. DevOps is coming to networking and that is a FACT. You might be wondering what skills a Network DevOps Engineer needs and here I attempt to answer that.
Dotfiles are all those . files that sit in your ~ and customize your system. Here are mine.
The final installment in this three part series. This covers installing Dokku and publishing your pelican blog to you new Docker-powere mini-Heroku.
The final installment in this three part series. This covers installing Dokku and publishing your pelican blog to you new Docker-powere mini-Heroku.
If you haven't read Part 1 or Part 2 yet, this should give you some background as to what I'm doing, why I'm doing it and how I built it. In this installment I'll focuse on the publishing side of things.
My former blog was hosted on a Linode 1024 VPS, which had a healthy 1GB RAM. I've been very happy with Linode and would recommend them to anybody who needs hosting, but for the convenience of having prebuild Ubuntu images with Dokku installed, I opted to host my blog with DigitalOcean. They have a full tutorial on their website that makes this very easy to set up.
One of the big benefits of using a static site generator is that the memory requirement is a lot less than Apache+PHP or Nginx+PHP. I'm hosting my site now on a $5/month VM from DigitalOcean which is a $15/month saving on my Wordpress site.
Once you have your Dokku installation set up, you can push your application to Continue reading
I'm using Cisco vocabulary 'glean' here as I don't know better word for it. Glean is any IPv4 packet which is going to connected host which is not resolved. It is NOT an ARP packet, so ARP policers won't help you. They are punted, since you need to generate ARP packet and try to resolve them.
In 7600 we can use 'mls rate-limit unicast cef glean 200 50' to limit how many packets per second are punted to control-plane for glean purposes. How can we limit this in JunOS? As far as I can see, there is no way. But I remember testing this attack and was unable to break MX80, so why didn't it break?
First let's check what does connected network look like
[email protected]> show route forwarding-table destination 62.236.255.179/32 table default Routing table: default.inet Internet: Destination Type RtRef Next hop Type Index NhRef Netif 62.236.255.0/24 intf 0 rslv 828 1 xe-0/0/0.42
Ok, fair enough. Type 'rslv', which we can guess means packet is punted to control-plane for resolving ARP. Let's try to ping some address rapidly which does not resolve and check what it looks like
Some HP L3 Switches Comware based, brings the concept of “switchports” as Bridge and Route mode.
The Bridge mode (port link-mode bridge) works the same way that any other access Switches.
When using Route mode (port link-mode route) the port is converted into a layer 3 interface, which need an IP address. All STP messages will be ignored.
Example
# interface GigabitEthernet4/0/1 port link-mode route ip address 192.168.1.1 255.255.255.0 # interface GigabitEthernet4/0/2 port link-mode bridge port link-type access port access vlan 2 #
Regards
In Parts 1, Part 2 and Part 3 we saw we can use the CEF table to express all sorts of different QoS policies. In Part 4 we describe how to attach a policy to the packet that will follow it around the network. Like many policies (security, shaping, etc.) it’s best to classify the […]
The post Secret CEF Attributes, Part 4 appeared first on Packet Pushers Podcast and was written by Dan Massameno.
Ladies and gentleman, unicorns of all ages, get ready for the greatest podcast on earth, Healthy Paranoia. Where the email is always encrypted and the firewalls are ever stateful. On this episode, we’ll be discussing Net Neutrality. Joining us is Sherry Lichtenberg, Principal for Telecommunications at the National Regulatory Research Institute; Andrew Gallo, network architect […]
The post Healthy Paranoia Show 22: The Three Ring Circus of Net Neutrality appeared first on Packet Pushers Podcast and was written by Mrs. Y.
Back in September 2013 I wrote a piece on why you would deploy VMware NSX with your Cisco UCS and Nexus gear. The gist being that NSX adds business agility, a rich set of virtual network services, and orders of magnitude better performance and scale to these existing platforms. The response to this piece was phenomenal with many people asking for more details on the how.
The choice is clear. To obtain a more agile IT infrastructure you can either:
To help you execute on choice #2, we decided to write a design guide that provides more technical details on how you would deploy VMware NSX for vSphere with Cisco UCS and Nexus 7000. In this guide we provide some basic hardware and software requirements and a design starting point. Then we walk you through how to prepare your infrastructure for NSX, how to design your host networking and bandwidth, how traffic flows, and Continue reading
Back in September 2013 I wrote a piece on why you would deploy VMware NSX with your Cisco UCS and Nexus gear. The gist being that NSX adds business agility, a rich set of virtual network services, and orders of magnitude better performance and scale to these existing platforms. The response to this piece was phenomenal with many people asking for more details on the how.
The choice is clear. To obtain a more agile IT infrastructure you can either:
To help you execute on choice #2, we decided to write a design guide that provides more technical details on how you would deploy VMware NSX for vSphere with Cisco UCS and Nexus 7000. In this guide we provide some basic hardware and software requirements and a design starting point. Then we walk you through how to prepare your infrastructure for NSX, how to design your host networking and bandwidth, how traffic flows, and Continue reading
Back in September 2013 I wrote a piece on why you would deploy VMware NSX with your Cisco UCS and Nexus gear. The gist being that NSX adds business agility, a rich set of virtual network services, and orders of magnitude better performance and scale to these existing platforms. The response to this piece was phenomenal with many people asking for more details on the how.
The choice is clear. To obtain a more agile IT infrastructure you can either:
To help you execute on choice #2, we decided to write a design guide that provides more technical details on how you would deploy VMware NSX for vSphere with Cisco UCS and Nexus 7000. In this guide we provide some basic hardware and software requirements and a design starting point. Then we walk you through how to prepare your infrastructure for NSX, how to design your host networking and bandwidth, how traffic flows, and Continue reading
There is quite often chatter about L3 incompletes, and it seems there are lot of opinions what they are. Maybe some of these opinions are based on some particular counter bug in some release. Juniper has introduced also toggle to allow stopping the counter from working. It seems very silly to use this toggle, as it is really one of the few ways you can gather information about broken packets via SNMP.
So if you are seeing them, what can you do? As it is aggregate counter for many different issues, how do you actually know which one is it and is there way to figure out who is sending them? Luckily for Trio based platforms answers and highly encouraging, we have very good tools to troubleshoot the issue.
To figure out what they exactly are, first you need to figure out your internal IFD index (not snmp ifindex)
im@ruuter> Continue reading
Mike Fratto joins us this week to talk about the news of the week on IPv4, Broadband Performance, Net Neutrality, IBM, SDN and more.
The post Coffee Break – Show 3 appeared first on Packet Pushers.
Mike Fratto joins us this week to talk about the news of the week on IPv4, Broadband Performance, Net Neutrality, IBM, SDN and more.
The post Coffee Break – Show 3 appeared first on Packet Pushers Podcast and was written by Greg Ferro.
As an administrator of network devices, keeping full backups is important for being able to recover from hardware failure. With F5 devices, backups come in the form of UCS files which is an archive that contains all configurations and SSL certificates. With a UCS file, you can take a replacement device, upload a UCS file […]
The post Configuration Backups for F5 appeared first on Packet Pushers Podcast and was written by Eric Flores.
