Network Study Site

HSRP Load Sharing

2024 Nov 15

HSRP Load Sharing Multiple HSRP Groups can be configured to share the traffic load between two gateway routers. With a pair of redundant routers, each device can be the HSRP Active for a particular Group. For example, R1 is Active for HSRP Group 1 and Standby ...

HSRP Introduction

2024 Nov 13

HSRP Introduction HSRP (Hot Standby Router Protocol) enables a redundant pair of gateway routers to act as a single virtual device towards hosts in a LAN. Hosts can point a default route to the virtual IP address created with HSRP. In the event of an HSRP primary router failure ...

DMVPN with PKI

2024 Nov 11

DMVPN with PKI DMVPN with PKI uses Digital Certificates to authenticate IPSec peers. Authenticating with Digital Certificates (PKI) is generally considered more secure than pre-shared keys. There are networks where PKI is used due to regulatory requirements ...

IPSec VPN with PKI

2024 Nov 4

IPSec VPN with PKI Digital Certificates provide a scalable and secure authentication mechanism for large IPSec VPN deployment. The Public Key Infrastructure (PKI) enables a Certificate Authority (CA) Server to sign and issue digital certificates to requesting client devices ...

BGP Route Server

2024 Nov 2

BGP Route Server A route server exchanges eBGP routes between connected peers. This is especially useful in Internet Exchange (IX) locations where many network edge routers share a common peering LAN segment ...

Remotely Triggered Black Hole

2024 Oct 29

Remotely Triggered Black Hole Remotely Triggered Black Hole (RTBH) is a network security feature that protects the denial-of-service attack victim address as well as the service provider infrastructure. RTBH drops traffic already on the Provider Edge (PE) devices so malicious flooding cannot enter an ISP network domain ...

BGP Synchronization

2024 Oct 28

BGP Synchronization BGP synchronization mitigates a type of failure scenario where an iBGP route is advertised to an eBGP peer, even though the iBGP route is not reachable. As a result, incoming traffic is dropped (traffic blackhole). This scenario can affect transit providers ...

EIGRP Authentication

2024 Oct 21

EIGRP Authentication EIGRP authentication is a routing protocol security mechanism to ensure only authorized EIGRP neighborships are established. The EIGRP Hello packet contains information about the type of authentication used, either MD5 or SHA ...

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