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Channel: Rich Bibby – NotTheNetwork.me
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CCNP ROUTE Study – OSPF adjacency set up

In this post we’re going to take a look at the process of two Cisco routers forming an OSPF neighbour adjacency, with an emphasis on what’s going on at a packet level. We’ll look at the packets sent...

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CCNP ROUTE Study – OSPF Authentication

We know that two OSPF routers will become neighbours if they can agree on certain parameters (see my previous post for details) and this is great, but suppose the bad guys were able to connect their...

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CCNP ROUTE Study – OSPF DR/BDR Elections (and how to rig them….)

When multiple OSPF routers are connected to a multi-access medium such as Ethernet, a Designated Router (DR) and a Backup Designated Router (BDR) are elected. DR’s reduce network traffic as only they...

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CCNP ROUTE Study – OSPF Virtual Links

One of the golden rules of OSPF is that all areas must be connected to the backbone area 0, however sometimes this is not physically possible, and this is where Virtual Links come in. A virtual link is...

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BGP Basics – iBGP and eBGP peering

This is the first post in a mini-series on BGP basics, and looks at setting up internal and external BGP neighbours using loopback interfaces. The advantage loopbacks have over physical interfaces is...

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BGP Basics – advertising networks into BGP

The first post in this BGP mini-series looked at setting up BGP peering between routers. Now we’ll take things a step further and actually exchange some routing information between those peers. Here’s...

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BGP Basics – modifying attributes

The previous post in this series looked at the exchange of routes between BGP peers, and this post takes this a step further by looking at two BGP attributes that can be modified to influence how a...

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Junos Basics – Securing J-Web Access On Juniper EX Series Switches

In my previous Junos Basics post I covered automatic configuration archiving. In this post we’ll step through a solution to prevent unauthorised access to the J-Web GUI on EX Series switches. This...

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How to log traffic dropped by Juniper SRX firewalls

Prior to working with Juniper SRX’s my firewall experience was predominantly Check Point. Two nice features of Check Point firewalls are Smart Log and Smart View Tracker which both provide easy access...

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Junos Basics – Route Based IPSec VPN’s

Here’s how to build a simple route based IPSec VPN between two Juniper SRX gateways. With a route based VPN, there is no particular policy tied to a VPN tunnel, rather traffic is forwarded across a...

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Quick and Easy Junos Labs with Vagrant and VirtualBox

It’s been far too long since my last blog post, mainly due to the fact that my spare time recently has been taken up with authoring a series of courses over at Pluralsight for the Juniper JNCIA-Junos...

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Automate Cisco DMVPN Deployment with Ansible

In this post we will automate the deployment of a Cisco DMVPN network. I use this as a lab for testing, but with a few tweaks you could use this to deploy a production DMVPN network. I’ve tested this...

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