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Network Design – VDSL

Introduction I’ve been through many network designs over the years and pretty much every UK ISP. A great design I settled on for business grade VDSL connections was by utilising a separate router on the front end with firewall behind.

David Messenger 7th February 20227th February 2022 Design, Networking No Comments Read more

Firewall Vendor Transitioning

Introduction This is quite a complex topic and can still be a tricky one to get right but I have developed a proven methodology that can be used very successfully.I have now used this methodology multiple times to transition from

David Messenger 22nd April 202022nd April 2020 Firewall, Juniper, Netscreen, Networking, Palo Alto, Security No Comments Read more

Assigning IP Addresses APC PDU via ARP

Introduction If you have ever ended up in the situation in which you have APC PDUs connected to your network which were never assigned management IP addresses then this is a nifty trick you can use to get them up

David Messenger 24th January 20203rd February 2020 APC, Data Centre, Networking No Comments Read more

SNMPv3 Setup

Introduction SNMP has been around for many years and even though the acronym stands for simple network management protocol, it is quite complex and takes significant time to understand exactly how to get the best from it. It is well

David Messenger 17th November 201928th January 2020 Network Monitoring, Networking, SNMP No Comments Read more

Configuring Multiple Default Routes Linux

Introduction No real need to explain the problem too in depth. A Linux machine with multiple interfaces accepts a packet on one interface but sends the reply out of another. Not going to work in the bulk of situations. Solution

David Messenger 31st May 201817th November 2019 Linux, Networking No Comments Read more

OSPFv3 Authentication Palo Alto to Cisco Router

Introduction OSPFv3 authentication is quite generally quite straightforward to configure between two Cisco devices. There are some great posts regarding this topic, in fact one of the best I’ve read is by the great Jeremy Stretch. http://packetlife.net/blog/2008/sep/3/ospfv3-authentication/ The issue I

David Messenger 6th April 20187th April 2018 Cisco, IOS, IOS-XE, IPv6, Networking, OSPFv3, Palo Alto 2 Comments Read more

Palo Alto Dual WAN branch office to Netscreen HQ

Palo Alto Dual WAN branch office to Netscreen HQ

Introduction The deployment of dual WAN firewall solutions in branch offices is often required to ensure fail-over for unreliable WAN connections. This type of deployment however can add additional complexity compared to a full BGP setup using capable routers. With

David Messenger 6th February 2018 Firewall, Networking, Palo Alto No Comments Read more

Juniper Netscreen Track IP

Juniper Netscreen Track IP

Introduction IP tracking can be used to change routing based on the connectivity of configured IP addresses. This can be used with either default routes or static routes which in normal circumstances would not change in the event of reachability

David Messenger 12th June 201712th June 2017 Firewall, Juniper, Netscreen, Netscreen, Networking, Security No Comments Read more

Cisco Span Port Configuration

Cisco Span Port Configuration

Introduction If you’ve ever needed to perform packet analysis for troubleshooting then you have options. If you have an IP base IOS image or above then it is likely you can do a packet capture directly on the switch however

David Messenger 10th May 201710th May 2017 Cisco, Network Monitoring, Networking, Wireshark No Comments Read more

Sophos UTM9 Reset Used IP count

Sophos UTM9 Reset Used IP count

Introduction If you’ve got the Sophos UTM up and running in your home network then you may come across this issue at some point. I was using UTM9’s web protection for quite some time and suddenly starting receiving emails to

David Messenger 12th October 201618th May 2017 Firewall, Networking, Security, Sophos UTM9 No Comments Read more
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