In this lab, we check how maximum equal paths feature works in RIP In this lab R2 advertises 2.2.2.2/32 subnetwork to R1 via RIP. R1 processed three equal paths through interfaces fa0/0, fa1/0 and...
Read More
Routing from scratch… Part 1
The person in A wants to join its colleagues in location B through the network topology described in the below figure. This person needs to go back home at the evening! ” This person...
Read More
Multicast routing: a step by step… Part 1
In the above test lab, Servers send multicast trafic to both clients. In IPv4, multicasting servers uses class D range of addresses: 224.0.0.0-239.255.255.255. Some addresses are well known and others for specific use… In...
Read More
Routing from scratch… Part 0
The person in A wants to join its colleagues in location B through the network topology described in the below figure. This person needs to go back home at the evening! ” This person...
Read More
What is the best way to subnetting?
Given a network ip address what would be the optimal subnetting method? optimal, such as to use the less possible ip addresses, the less possible subnets, a subnet per vlan, multiple subnets per vlan,...
Read More
Cisco HSRP in detail
RFC 2281, What does RFC 2281 say about Cisco HSRP that may affect the IP traffic flow process? Lab setup, Let us analyze the IP traffic forwarding process in our lab setup: The logical...
Read More
My first scapied IPv6 packet
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...
Read More
BGP session keepalive and hold times
At the beginning of the BGP peering establishment, the BGP neighbors agree on the hold time value (included in OPEN message): the time a peering would be maintained without the reception of a KEEPALIVE...
Read More
Vlan propagation and Cisco FabricPath
PC-A and PC-B belong to the same broadcast domain that is defined by vlan X. Without FabricPath (FP), a frame that is sent by PC-A is received by FP-SW1. PC-1 MAC source address is...
Read More
At the begining, … it was not DMVPN!
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...
Read More
EIGRP over a vNET trunk
New IOS release 15.x introduced Easy Virtual Network (EVN) functionality to leverage some existing deployment features such as VRF-Lite and QinQ. Its ease of configuration is a real advantage. The idea is very simple:...
Read More