TEK@link

Multicast: Hold ASM for a moment, let’s do SSM!… Part 4

août 27, 2024

Is it sufficient RIP split-horizon rule to prevent routing loops?

août 27, 2024

RIP: do not split it then… and unleach the power of the “network” command

août 27, 2024

Multicast routing: a step by step… Part 1

août 27, 2024

D.A.T(er) comme un professionnel, un Architecte…

juillet 12, 2023

Featured Posts

10 Minutes

ASM IGMP Multicast Network SSM

Multicast: Hold ASM for a moment, let’s do SSM!… Part 4

août 27, 2024

8 Minutes

Network RIP Routing

Is it sufficient RIP split-horizon rule to prevent routing loops?

août 27, 2024

7 Minutes

Network RIP

RIP: do not split it then… and unleach the power of the “network” command

août 27, 2024

7 Minutes

Multicast Network Routing Switching

Multicast routing: a step by step… Part 1

août 27, 2024

Firewalling

4 Minutes

Firewalling Fortinet NAT and PAT Network Security SSL Vendor VPN

SSL VPN to my home network

atlink'admin juin 12, 2019 0 Comment

In this blog let’s try to connect to a home network from outside (internet) in a secure manner using...

Setup a Check Point Lab using VirtualBox and GNS3 on Windows

janvier 24, 2018

Static routing with intermediate address in Checkpoint firewall

janvier 23, 2018

10 security measures against 10 attacks in a LAN network – Part I

février 16, 2017

System

9 Minutes

Router config to Excel

juillet 25, 2023

Windows : Drive healing from scratch

mai 28, 2020

5 Minutes

Network

Routing from scratch… Part 1

atlink'admin juillet 1, 2019 0 Comment

In this serie of posts we’ll explore routing operation. Let’s start from the general idea of how could we manage trafic, a move from one location to another… In the example of the figure...

4 Minutes

Firewalling Fortinet NAT and PAT Network Security SSL Vendor VPN

SSL VPN to my home network

atlink'admin juin 12, 2019 0 Comment

In this blog let’s try to connect to a home network from outside (internet) in a secure manner using SSL. NAT and PAT NAT and PAT is what allowed local IP addresses translation or...

4 Minutes

Network Subnetting

What is the best way of subnetting?

atlink'admin mars 13, 2019 0 Comment

In this post, let’s recall what is subnetting (for routing and switching purposes) and how it is done. introduction and motivation Network subnetting is very important subject that maybe referred to as VLSM for...

5 Minutes

Ethernet Network

How speed is my Ethernet cable?

atlink'admin mars 12, 2019 0 Comment

In this post let’s talk about cabling, especially ethernet cabling to meet speeds of 1 gig. 4 elements are discussed : operation as described in the standard, awg metric, pinout and twist. Alternatives to...

11 Minutes

Cisco HSRP Network Vendor

Cisco HSRP in detail (RFC 2281)

atlink'admin janvier 4, 2019 0 Comment

HSRP is one of the most know FHRP (Fisrt Hop Routing) protocols proposed by Cisco to help secure (in terms of redundancy) the gateway (for hosts or servers) in a LAN. The objective is...

17 Minutes

IPv6 Network Programming Python

My first scapied IPv6 packet

atlink'admin décembre 24, 2018 0 Comment

The idea of this lab is to craft an IPv6 packet from scratch using Python and Scapy library. The IDE I use is JetBrains PyCharm Community Edition 2018.3.1 x64 which is available for free...

5 Minutes

BGP Network

BGP session keepalive and hold times

atlink'admin juillet 3, 2018 0 Comment

In this post we’ll deep into the operation of BGP that is a Border Gateway protocol aimed at connecting (routing information exchange) autonomous system in contrast with IGP (Interior Gateway Protocols) that run into...

8 Minutes

BGP EIGRP Network OSPF RIP

I-BGP synchronization with IGP

atlink'admin juin 28, 2018 0 Comment

By definition, the BGP synchronization rule requires that when a BGP router receives information about a network from an I(nternal)-BGP neighbor, it does not use this information until a matching route : static or...

6 Minutes

Firewalling Security

Setup a Check Point Lab using VirtualBox and GNS3 on Windows

atlink'admin janvier 24, 2018 0 Comment

In this lab we implement a basic security architecture to demonstrate the operation of a firewall cluster to protect our network. Our « security domain » is segmented into four zones: Our security topology is compound...

6 Minutes

Firewalling Security

Static routing with intermediate address in Checkpoint firewall

atlink'admin janvier 23, 2018 0 Comment

Static routing is supported by CKP (Checkpoint firewalls or gateways). Let’s recall that a static route defines a destination subnet or network and the way to reach it: the outgoing interface on the gateway,...

6 Minutes

Fabric Path IPv4 IS-IS LACP MAC Multicast Network Routing

Vlan propagation and Cisco FabricPath

atlink'admin novembre 21, 2017 0 Comment

In this post, we explore the operation of Cisco FabricPath (FP) and more specifically Vlan information propagation in this fabric in comparison with other platforms: Catalyst for example from the same vendor. The case...

4 Minutes

DMVPN Network

At the begining, … it was not DMVPN!

atlink'admin novembre 20, 2017 0 Comment

The simplest way to interconnect 3 or more routers in the same broadcast domain (and the same subnet) is by attaching them to a switch (or hub) in the same vlan. In case they’re...

6 Minutes

BGP Cisco Network

VPNv4 BGP AS-Override Feature into play!

atlink'admin septembre 17, 2017 0 Comment

Let’s put into play AS-Override feature in BGP: see when it applies and how it works. First, AS-Override feature applies to sites that have the same AS number but are linked by another different...

7 Minutes

Cisco Network OSPF

Point-to-Point OSPF Network Operation over a LAN that connects multiple routers

atlink'admin août 28, 2017 0 Comment

What happens when LAN interfaces are configured as point-to-point network type OSPF interfaces instead of default broadcast type? And more than 2 ospf routers are present on this media? Let’s test this on network...

4 Minutes

Aruba Network Vendor WIFI

Understand how Aruba ARMizes your WLAN for sure!

atlink'admin février 16, 2017 0 Comment

Presenting ARM In this post, that is a part of a serie of post that discuss how Wlan to radio ressources management, we talk of Aruba way of doing it. The figure shows a...

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TEK@link

Multicast: Hold ASM for a moment, let’s do SSM!… Part 4

Is it sufficient RIP split-horizon rule to prevent routing loops?

RIP: do not split it then… and unleach the power of the “network” command

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Featured Posts

Multicast: Hold ASM for a moment, let’s do SSM!… Part 4

Is it sufficient RIP split-horizon rule to prevent routing loops?

RIP: do not split it then… and unleach the power of the “network” command

Multicast routing: a step by step… Part 1

Firewalling

SSL VPN to my home network

Setup a Check Point Lab using VirtualBox and GNS3 on Windows

Static routing with intermediate address in Checkpoint firewall

10 security measures against 10 attacks in a LAN network – Part I

System

Router config to Excel

Windows : Drive healing from scratch

Routing from scratch… Part 1

SSL VPN to my home network

What is the best way of subnetting?

How speed is my Ethernet cable?

Cisco HSRP in detail (RFC 2281)

My first scapied IPv6 packet

BGP session keepalive and hold times

I-BGP synchronization with IGP

Setup a Check Point Lab using VirtualBox and GNS3 on Windows

Static routing with intermediate address in Checkpoint firewall

Vlan propagation and Cisco FabricPath

At the begining, … it was not DMVPN!

VPNv4 BGP AS-Override Feature into play!

Point-to-Point OSPF Network Operation over a LAN that connects multiple routers

Understand how Aruba ARMizes your WLAN for sure!

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My first scapied IPv6 packet