How Does Generic Routing Encapsulation Tunnel Work?

In this post, I have explained Generic Routing Encapsulation (GRE) and its configuration process. GRE is a protocol that encapsulates packets to allow other protocols to be routed over IP networks. RFC 2784 is the standard that defines GRE. Generic Routing Encapsulation...

EIGRP HMAC-SHA-256 Authentication

Packets transmitted between neighbors must be validated to ensure that only devices with the same preshared authentication key accept packets. Authentication for the EIGRP is a customizable per interface, which implies that packets sent between neighbors connected by an...

What are the benefits of using EIGRP authentication?

EIGRP is one of the routing protocols that can be adjusted to avoid receiving erroneous routing updates. Someone could try to build an EIGRP neighbor adjacency with one of your routers if you don't employ authentication and you're using EIGRP.Isn't that something we'd...

Understanding the Operation of DHCP Relay Agents

The discover and request messages are broadcast in the DORA process, and the offer and acknowledgement messages are broadcast or unicast depending on the value of the broadcast flag, i.e. if the value of the broadcast flag is 1, the offer and acknowledgement messages are...