Ethan Banks recently wrote a nice blog post detailing the benefits and drawbacks of traditional routing protocols and comparing them with their SD-WAN counterparts.
While I agree with everything he wrote, the comparison between the two isn’t exactly fair – it’s a bit like trying to cut the cheese with a chainsaw and complaining about the resulting waste.
Read more ...The GNS3 development team produced a major new release, version 1.0, in October 2014. Since then, they have been regularly updating GNS3 and, at the time I write this, the latest version of GNS3 is version 1.3.7.
The latest version of GNS3 cannot be installed using a package manager like Ubuntu Software Center or Synaptic because no packages have been created yet for GNS3 1.x. The Ubuntu repository and the GNS3 PPA only provide packages for old versions of GNS3. The latest version of the GNS3 package for Debian/Ubuntu is GNS3 0.8.7.
The GNS3 development team is working on packages for GNS3 1.x but, as of the time I post this, it is not clear when they will be available.
To install the latest version of GNS3 on an Ubuntu Linux system, install the dependencies, download the GNS3 source files, and compile the software. I provide the list of commands in this post.
We will use GNS3 to build a simulated network consisting of open-source routers, switches, and hosts so we only need to install the GNS3 GUI, the GNS3 Server, and VPCS. However, in the sections below, Continue reading
I was working with several peers in Asia over the last few years on big network build outs. As everyone should know, limited IPv4 space means you really need to engineer everything for IPv6 with IPv4 as the “extra” protocol. The real state of vendor IPv6 readiness was a shocker. It was rare to find […]
The post IPv6 “RFP Requirements” – What do you include? appeared first on Packet Pushers Podcast and was written by Barry Greene.
In this third entrant into the design & build series, Guilherme Goes & Jeff Carrell join Ethan Banks for a discussion of running IPv4 & IPv6 dual stack.
The post Show 244 – Design & Build #3 – Dual Stack IPv4 + IPv6 appeared first on Packet Pushers.
In this third entrant into the design & build series, Guilherme Goes & Jeff Carrell join Ethan Banks for a discussion of running IPv4 & IPv6 dual stack.
The post Show 244 – Design & Build #3 – Dual Stack IPv4 + IPv6 appeared first on Packet Pushers Podcast and was written by Ethan Banks.
Please join us in congratulating the following iPexpert students who have passed their CCIE lab!
Have you passed your CCIE lab exam and used any of iPexpert’s self-study products, or attended a CCIE Bootcamp? If so, we’d like to add you to our CCIE Wall of Fame!
CloudFlare operates a huge global network of servers that proxy our customers' web sites, operate as caches, inspect requests to ensure they are not malicious, deflect DDoS attacks and handle one of the largest authoritative DNS systems in the world. And where there's software there's configuration information.
CloudFlare is highly customisable. Each customer has a unique configuration consisting of DNS records, all manner of settings (such as minification, image recompression, IP-based blocking, which individual WAF rules to execute) and per-URL rules. And the configuration changes constantly.
We offer almost instant configuration changes. If a user adds a DNS record it should be globally resolvable in seconds. If a user enables a CloudFlare WAF rule it should happen very, very fast to protect a site. This presents a challenge because those configuration changes need to be pushed across the globe very quickly.
We've written in the past about the underlying technology we use: Kyoto Tycoon and how we secured it from eavesdroppers. We also monitor its performance.
DNS records are currently changing at a rate of around 40 per second, 24 hours a day. All those changes need to be propagated in seconds.
So we take propagation times Continue reading
This is a blog post that I had written for my employer CloudFlare You can find the full link here
CloudFlare operates a
I recently had to deploy and ASA pair. One of the pre-requisites is to make sure there’s an optic in the interface we’re going to use. On a switch you have the following options:
#show int te5/4 transceiver
Transceiver monitoring is disabled for all interfaces.
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
If device is externally calibrated, only calibrated values are printed.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
NA or N/A: not applicable, Tx: transmit, Rx: receive.
mA: milliamperes, dBm: decibels (milliwatts).
Optical Optical
Temperature Voltage Current Tx Power Rx Power
Port (Celsius) (Volts) (mA) (dBm) (dBm)
---------- ----------- ------- -------- -------- --------
Te5/4 27.0 0.00 7.6 -- -2.2 -2.7
Or
#show int tenGigabitEthernet 5/4 capabilities
TenGigabitEthernet5/4
Model: VS-S720-10G
Type: 10Gbase-SR
Speed: 10000
Duplex: full
Trunk encap. type: 802.1Q,ISL
Trunk mode: on,off,desirable,nonegotiate
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off,on),tx-(off,on)
Membership: static
Fast Start: yes
QOS scheduling: rx-(8q4t), tx-(1p7q4t)
QOS queueing mode: rx-(cos,dscp), tx-(cos,dscp)
CoS rewrite: yes
ToS rewrite: yes
Inline power: no
Inline power policing: no
SPAN: source/destination
UDLD yes
Link Debounce: yes
Link Debounce Time: yes
Ports-in-ASIC (Sub-port ASIC) Continue reading
Friday is SDxCentral Roundup Day. Get yours here.
Extending SDN programmability all the way across the WAN.
