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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...
View ArticleJunos 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...
View ArticleHow 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...
View ArticleQuick 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...
View ArticleAutomate 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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