Now that I’ve finished learning about SDN, and then studied for and passed my latest Cisco certification (CCNA Security, keeping that vendor certification path open!), I’ve gotten into the groove of studying at night (and I as I love IT, and specifically networking, it’s kinda become my hobby… I know, lame, right?) In any case, […]
The post Back to the Basics… appeared first on Packet Pushers Podcast and was written by Will Dennis.
Introduction Note: This assumes you’re on a linux machine, but it should work on any box where you can install and run Bash, for example windows with Cygwin. (You’ll also need the date program from GNU Core Utilities too, but that’s installed by default on any normal Linux or Cygwin system.) Note: For simplicity the […]
The post Bash and Net-SNMP: a low budget, high frequency SNMP poller appeared first on Packet Pushers Podcast and was written by Nik Weidenbacher.
When using an F5 load balancer there are 2 predominant ways to setup the network topology. While there are many different names for these methods, in this article I will call them “load balancer on a stick” and in-line. Although the article is about the in-line method, we will quickly review both methods for comparison. […]
The post Stateless Routing Through an in-line F5 LTM appeared first on Packet Pushers Podcast and was written by Eric Flores.
Swapped from AT&T to T-Mobile in order to take advantage of their 4G/LTE IPv6 network. Since I dogfood IPv6 every chance I get, and the cost to swap saved me a whopping $0.50, I moved forward with it. I find that if I set their EPC.TMOBILE.COM APN to IPv4/IPv6, I don’t really see much in the way of dual-stack actually working on the phone. So I set it from the default IPv4 to just IPv6, and that got it working with native IPv6 and using CLAT+NAT64/DNS64 for IPv4 sites. Screenshot from my Galaxy Nexus running 4.3:
New product expands visibility into complex multicast routing configurations, speeds troubleshooting, and makes planning more accurate
From market trading data distribution to Internet Protocol television (IPTV) to online education, use of multicast routing is growing but the ability to manage it across networks has been limited. Building on its pioneering work in route analytics, Packet Design has launched Multicast Explorer, an optional module of the company’s flagship Route Explorer system, to provide unprecedented visibility into complex multicast routing configurations. With improved troubleshooting and proactive management – including interactive modeling – network professionals can enhance multicast service quality as well as prevent interruptions and outages. This is particularly important where failures carry severe penalties, such as in the financial services industry.
Going beyond traditional SNMP and CLI pollers, Multicast Explorer collects and analyzes all IGP routing announcements in real time using a passive technique as well as data collection methods optimized for all major vendor routers. This means the information is always current and accurate for monitoring and troubleshooting multicast issues quickly, preventing the tedious process of querying individual routers and manually correlating the resulting data. If any planned or unplanned configuration changes occur, network managers know immediately Continue reading
So I got to do some honest IPv6 related work at the job the last 2 weeks. One task was to verify we had IPv6 working on the load balancers to hosts behind it. I was a bit wary of the state of IPv6 security on these A10 LBs, so I opted to keep the globally routed IPv6 space on the LB’s uplink interface, and the VIPs. And behind the scenes, use ULA.
Step 1: I generated a /48 of ULA for the location, and assigned a /64 for use on the VLAN that the inside interface of the LB sits on with the servers themselves.
Step 2: Configure ::1/64 on the LB inside vlan interface, and ::2/64 on a server, and verified that they could reach each other.
Step 3: I installed lighttpd on the server and configured it to listen on the ULA address.
Step 4: From my ARIN allocation, I have a /64 reserved for configuring /126s on device links to the router, so I configured it on the LB’s dedicated interface on the router. Using ::1/126 on the router; ::2/126 on the LB’s interface; ::3/126 as the VIP.
Step 5: Create on the LB an “IPv6 Continue reading
If someone tosses you a hot potato, do you want to hold it a long time? If you like pain maybe the answer is yes – but how many of us like pain? In the same way, hot potatoes are very applicable to the Service Provider environment. When a service provider receives a packet, if […]
The post Hot,Cold, Mash Potato Routing and BGP Route Reflector Design Considerations. appeared first on Packet Pushers Podcast and was written by Orhan Ergun.
Introduction If you manage MPLS VPNs on Juniper Networks devices running Junos (or are learning about doing so), this tip should make your life easier. I can’t imagine operating MPLS VPNs on a scale of more than a handful of VPNs without it. Below I’ll describe how it works, and then to make sure it’s […]
The post MPLS VPNs and Junos config groups: a match made in router heaven appeared first on Packet Pushers Podcast and was written by Nik Weidenbacher.
Someone asked so lets walk through the overhead introduced when using IPSec with AES; it’s higher than you might think and I haven’t even factored in ISAKMP. Encryption really isn’t ‘my bag’ so if anything is wrong, do let me know; hopefully public scrutiny will mean I can truly rely on these figures. Take a […]
The post IPSec Bandwidth Overhead Using AES appeared first on Packet Pushers Podcast and was written by Steven Iveson.
In our last episode (it’s been two weeks!), we talked about P’s and Q’s. Now we’ll get down into a few details, and think through what is probably the simplest mechanism ever designed for finding alternate loop free paths through a two connected network: not-via. Let’s use the embedded network as an example. In this […]
On this Packet Pushers podcast, hosts Ethan Banks and Greg Ferro are joined by Petr Lapukhov for a discussion about his IETF draft on BGP SDN, co-authored with Edet Nkposong. Guests Russ White and Ivan Pepelnjak also join in the discussion, quizzing Petr about the details of the draft and how implementation has worked out thus far […]
The post Show 164 – Cool or Hot? Lapukhov + Nkposong’s BGP SDN appeared first on Packet Pushers Podcast and was written by Ethan Banks.
