Exploring OSPF Messages Between New Neighbors
A basic network is setup and OSPF is configured. R1 is then prevented from forming an OSPF adjacency with R2 due to R1’s serial interface being configured as a passive interface.
Only Hello packets are seen from R2.
From this Wireshark output we can see:
- OSPF Version 2 is utilized
- This is a Hello packet
- The Hello packet is sourced from a router with OSPF Router ID 2.2.2.2. Duplicate RIDs will prevent an OSPF adjacency and cause other issues.
- The interface that sourced this Hello packet resides in OSPF area 0. This item is used to verify that the two connected router interfaces are within the same OSPF area – this is a requirement in order to form an OSPF adjacency.
- No authentication is used
- A /30 network mask is used on R2’s connected interface. This item is used to verify that the two connected router interfaces are using the same subnet mask, which is a requirement in order to form an OSPF adjacency in addition to the two interfaces being within the same primary subnet.
- Hello and Dead timers. These must be the same on both connected routers in order to Continue reading
MrsJanitor’s Aus-Some Tour of SFO / SJC
Well I just got my itinerary for my trip to Sunnyvale for the Juniper Ambassador’s Summit in October and my wife and I have decided to spend an extra couple of days either side to get out and see the sites. We will be arriving in San Francisco at 11am Sat 5th of October and flying out around 11pm on Friday 12th, and we are looking to fill our schedule!
This is my wife’s first trip to the US, and I know she wants to get out and about and see things (also probably while Im in conference too). I know her list includes seeing the Golden Gate Bridge and Alcatraz… oh… and… “The Full House House”.
Thankfully we have the company of two of my good friends who are locals – Ashton (from Juniper) and my old work mate Cooper Lees, and we are working out “what we should see”.
So what do you consider “must see” things in this area? Let me know in the comments and we will see what we can fit in.
Also, while we’re in town, I would love to catch up with any locals in the area for drinks/coffee/food etc so Continue reading
The Priorities Bill of Rights – 10 practical steps to managing group priorities
Managers everywhere are abusing their employees by using priorities to convey to-do lists. It is not because of anything insidious in their objectives, but the average manager (both low- and high-level, by the way) simply doesn’t think enough about priorities to really do anything meaningful with them. For teams I lead, our entire existence revolves […]
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The post The Priorities Bill of Rights – 10 practical steps to managing group priorities appeared first on Packet Pushers Podcast and was written by Michael Bushong.
NFD6 Vendor Preview: Aruba Networks
I’ll be the first to admit, I don’t really know that much about Aruba Networks. They’re most widely known for their work in the wireless area and that’s an area of technology I have yet to play with. As someone who is admittedly wireless-green, I’m eager to get schooled. While they may be new to me, they are heavily involved with the Tech Field Day community, especially at Wireless Field Day events.[Overlay Networking] Part 3 – The Underlay
We finally arrive at the physical topology that all of the stuff I discussed in the previous posts is built upon. “Underlay” is a term that is starting to catch on - this describes the infrastructure that all of the overlay networks ride on top of, and I’ll be using it to describe this physical infrastructure in this post. Keep in mind the term is used no matter how our physical infrastructure is laid out - there’s quite a few different ways to build this thing.NFD6 Vendor Preview: Big Switch
Big Switch will be making their first appearance at Network Field Day 6 next week, and I’m pretty excited to hear their session. This isn’t their first appearance at a Tech Field Day event, however. They first appeared at the OpenFlow Symposium back in 2011. I re-watched that video and realized that they were talking about network virtualization a long time ago. They even made the statement that they viewed SDN “like VMware but for networking” - something we’re hearing a lot of these days.[Overlay Networking] Part 3 – The Underlay
We finally arrive at the physical topology that all of the stuff I discussed in the previous posts is built upon. “Underlay” is a term that is starting to catch on - this describes the infrastructure that all of the overlay networks ride on top of, and I’ll be using it to describe this physical infrastructure in this post. Keep in mind the term is used no matter how our physical infrastructure is laid out - there’s quite a few different ways to build this thing.NFD6 Vendor Preview: Aruba Networks
I’ll be the first to admit, I don’t really know that much about Aruba Networks. They’re most widely known for their work in the wireless area and that’s an area of technology I have yet to play with. As someone who is admittedly wireless-green, I’m eager to get schooled. While they may be new to me, they are heavily involved with the Tech Field Day community, especially at Wireless Field Day events.NFD6 Vendor Preview: Big Switch
Big Switch will be making their first appearance at Network Field Day 6 next week, and I’m pretty excited to hear their session. This isn’t their first appearance at a Tech Field Day event, however. They first appeared at the OpenFlow Symposium back in 2011. I re-watched that video and realized that they were talking about network virtualization a long time ago. They even made the statement that they viewed SDN “like VMware but for networking” - something we’re hearing a lot of these days.[Overlay Networking] Part 3 – The Underlay
We finally arrive at the physical topology that all of the stuff I discussed in the previous posts is built upon. “Underlay” is a term that is starting to catch on - this describes the infrastructure that all of the overlay networks ride on top of, and I’ll be using it to describe this physical infrastructure in this post. Keep in mind the term is used no matter how our physical infrastructure is laid out - there’s quite a few different ways to build this thing.NFD6 Vendor Preview: Plexxi
Plexxi was first involved with Network Field Day about 5 months ago at Network Field Day 5. There, they demo’d their very unique approach to networking. You won’t hear about Plexxi without hearing about their WDM-based optical network design. You may even hear it referred to unofficially as Layer 1 SDN - and that’s a pretty apt description. Plexxi uses special From a logical perspective (kind of semi-logical and semi-physical) I think it’s great.[Overlay Networking] Part 1 – The Basics
Wow. Lots of talk regarding overlay networking, both last week, and now this week. No doubt largely caused by the VMware NSX announcement last week. This post is an attempt on my part to clarify some fundamental ideas regarding overlay networking for my own benefit, but hopefully it helps you too. After all, we’re all learning. I’ll also be referring a LOT to some community content from blogs and twitter, because there’s a lot of great opinions out there.[Overlay Networking] Part 2 – VTEPs and Software
In the previous post, we discussed the role of the overlay network, and the virtual switches they connect to. In this post, we’re going to talk about a few additional components. The Role of the Hardware VTEP There’s been a lot of talk about VTEP, and how virtually every networking vendor but Cisco is part of this elaborate ecosystem of vendors that contribute to the angelic glory that is NSX.[Overlay Networking] Part 2 – VTEPs and Software
In the previous post, we discussed the role of the overlay network, and the virtual switches they connect to. In this post, we’re going to talk about a few additional components. The Role of the Hardware VTEP There’s been a lot of talk about VTEP, and how virtually every networking vendor but Cisco is part of this elaborate ecosystem of vendors that contribute to the angelic glory that is NSX.[Overlay Networking] Part 1 – The Basics
Wow. Lots of talk regarding overlay networking, both last week, and now this week. No doubt largely caused by the VMware NSX announcement last week. This post is an attempt on my part to clarify some fundamental ideas regarding overlay networking for my own benefit, but hopefully it helps you too. After all, we’re all learning. I’ll also be referring a LOT to some community content from blogs and twitter, because there’s a lot of great opinions out there.[Overlay Networking] Part 2 – VTEPs and Software
In the previous post, we discussed the role of the overlay network, and the virtual switches they connect to. In this post, we’re going to talk about a few additional components. The Role of the Hardware VTEP There’s been a lot of talk about VTEP, and how virtually every networking vendor but Cisco is part of this elaborate ecosystem of vendors that contribute to the angelic glory that is NSX.[Overlay Networking] Part 1 – The Basics
Wow. Lots of talk regarding overlay networking, both last week, and now this week. No doubt largely caused by the VMware NSX announcement last week. This post is an attempt on my part to clarify some fundamental ideas regarding overlay networking for my own benefit, but hopefully it helps you too. After all, we’re all learning. I’ll also be referring a LOT to some community content from blogs and twitter, because there’s a lot of great opinions out there.NFD6 Vendor Preview: Plexxi
Plexxi was first involved with Network Field Day about 5 months ago at Network Field Day 5. There, they demo’d their very unique approach to networking. You won’t hear about Plexxi without hearing about their WDM-based optical network design. You may even hear it referred to unofficially as Layer 1 SDN - and that’s a pretty apt description. Plexxi uses special From a logical perspective (kind of semi-logical and semi-physical) I think it’s great.Forum Going Away – But New Things Are Coming
Roughly a year ago, we built forum.packetpushers.net. This was a forum site built on vBulletin. The idea was to give the community another place to exchange ideas, share information, and help each other with challenges. After considering the matter for a couple of months, Greg and I are going to shut the site down. For […]
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The post Forum Going Away – But New Things Are Coming appeared first on Packet Pushers Podcast and was written by Ethan Banks.
Masterclass – Tcpdump – Interpreting Output
This Masterclass article series aims to provide in-depth technical information on the installation, usage and operation of the classic and supremely popular tcpdump network traffic analysis program including alternatives, running tcpdump as a process, building expressions, understanding output and more. I’ve covered the Basics, Parameters and filter Expressions previously; last up in the series is […]
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The post Masterclass – Tcpdump – Interpreting Output appeared first on Packet Pushers Podcast and was written by Steven Iveson.