OSPF External Routes (Type-5 LSA) Mysteries

Daniel Dib posted a number of excellent questions on Twitter, including:

While forwarding a received Type-5 LSA to other areas, why does the ABR not change the Advertising Router ID to it’s own IP address? If ABR were able to change the Advertising Router ID in the Type-5 LSA, then there would be no need for Type-4 LSA which meant less OSPF overhead on the network.

TL&DR: The current implementation of external routes in OSPF minimizes topology database size (memory utilization)

Before going to the details, try to imagine the environment in which OSPF was designed, and the problems it was solving.

Read more …

OSPF External Routes (Type-5 LSA) Mysteries

Daniel Dib posted a number of excellent questions on Twitter, including:

While forwarding a received Type-5 LSA to other areas, why does the ABR not change the Advertising Router ID to it’s own IP address? If ABR were able to change the Advertising Router ID in the Type-5 LSA, then there would be no need for Type-4 LSA which meant less OSPF overhead on the network.

TL&DR: The current implementation of external routes in OSPF minimizes topology database size (memory utilization)

Before going to the details, try to imagine the environment in which OSPF was designed, and the problems it was solving.

Read more …

What is a network router?

By most definitions, the network router’s purpose is defined by its name – it routes packets from one location to another. But over the course of decades of internet networking, the value of the router has grown significantly, offering enterprises additional functions such as network security, content filtering, quality of service, and more.At its most basic level, a router is a device that connects networks to each other, forwarding data packets from one location to another until they reaches their destination. Within a local area network (LAN), a router can also allow multiple devices to use the same Internet connection, such as how a home router allows users to connect their laptops, phones and tablets (among countless other devices) at the same time.To read this article in full, please click here

What is a network router?

By most definitions, the network router’s purpose is defined by its name – it routes packets from one location to another. But over the course of decades of internet networking, the value of the router has grown significantly, offering enterprises additional functions such as network security, content filtering, quality of service, and more.At its most basic level, a router is a device that connects networks to each other, forwarding data packets from one location to another until they reaches their destination. Within a local area network (LAN), a router can also allow multiple devices to use the same Internet connection, such as how a home router allows users to connect their laptops, phones and tablets (among countless other devices) at the same time.To read this article in full, please click here

Tech Bytes: Get Early Attack Detection And Fast Response With Fortinet FortiDeceptor (Sponsored)

Today on the Tech Bytes podcast we’re talking deception. That is, deceiving attackers that try to exploit your network by creating fake assets and infrastructure. Sponsor Fortinet is here to talk about using deception techniques to spot intruders via its FortiDeceptor product. We’ll also talk about threat reconnaissance capabilities of a product called FortiRecon. Our guest is Moshe Ben Simon, VP of Product Management.

Tech Bytes: Get Early Attack Detection And Fast Response With Fortinet FortiDeceptor (Sponsored)

Today on the Tech Bytes podcast we’re talking deception. That is, deceiving attackers that try to exploit your network by creating fake assets and infrastructure. Sponsor Fortinet is here to talk about using deception techniques to spot intruders via its FortiDeceptor product. We’ll also talk about threat reconnaissance capabilities of a product called FortiRecon. Our guest is Moshe Ben Simon, VP of Product Management.

The post Tech Bytes: Get Early Attack Detection And Fast Response With Fortinet FortiDeceptor (Sponsored) appeared first on Packet Pushers.

Using functions in bash to selectively run a group of Linux commands

Using a function in bash allows you to create something in Linux that works as if it were a script within a script. Whenever the data being processed matches a set of conditions, your script can call a function that does further processing.The format of a function is very straightforward. The syntax looks like this:<function_name> () { <commands> } You can also use the following format that uses the word "function" if you prefer:function <function_name> { <commands> } In fact, you can also create a function on a single line if the commands to be run are limited, but note the required “;” that follows the command(s):To read this article in full, please click here

Using functions in bash to selectively run a group of Linux commands

Using a function in bash allows you to create something in Linux that works as if it were a script within a script. Whenever the data being processed matches a set of conditions, your script can call a function that does further processing.The format of a function is very straightforward. The syntax looks like this:<function_name> () { <commands> } You can also use the following format that uses the word "function" if you prefer:function <function_name> { <commands> } In fact, you can also create a function on a single line if the commands to be run are limited, but note the required “;” that follows the command(s):To read this article in full, please click here

Google Cloud adds networking, security features for enterprises

Google Cloud is rolling out new network and security features, including a service that provides Layer-7 security.The new offerings announced at Google Cloud Next also include firewall and web application-protection options aimed at advancing existing cloud connectivity and ensuring the security of cloud-based resources.“We are fundamentally enhancing our network fabric—which includes 35 regions, 106 zones and 173 network edge locations across 200-plus countries—and making it simpler and easier for organizations to migrate their existing workloads and modernize applications all while securing and making them easier to manage,” said Muninder Sambi, vice president and general manager of networking for Google Cloud.To read this article in full, please click here

Google Cloud adds networking, security features for enterprises

Google Cloud is rolling out new network and security features, including a service that provides Layer-7 security.The new offerings announced at Google Cloud Next also include firewall and web application-protection options aimed at advancing existing cloud connectivity and ensuring the security of cloud-based resources.“We are fundamentally enhancing our network fabric—which includes 35 regions, 106 zones and 173 network edge locations across 200-plus countries—and making it simpler and easier for organizations to migrate their existing workloads and modernize applications all while securing and making them easier to manage,” said Muninder Sambi, vice president and general manager of networking for Google Cloud.To read this article in full, please click here

Google Cloud service aims to ease mainframe migration

Google Cloud has extended its mainframe migration services to include a new option that enables parallel processing – customers can simultaneously run their mainframe workloads on prem and in the cloud, with the ultimate goal of moving those resources to the cloud.The new service, Dual Run for Google Cloud, is in preview status and lets customers run workloads on their existing mainframes and on Google Cloud concurrently without interrupting operations. Enterprises can then perform real-time testing and determine application performance and stability in the cloud. A large challenge with mainframe systems is the tight coupling of data to the application layer. Companies would have to stop an application for some period of time in order to move it, modernize it or transform it, according to Google.To read this article in full, please click here

Google Cloud service aims to ease mainframe migration

Google Cloud has extended its mainframe migration services to include a new option that enables parallel processing – customers can simultaneously run their mainframe workloads on prem and in the cloud, with the ultimate goal of moving those resources to the cloud.The new service, Dual Run for Google Cloud, is in preview status and lets customers run workloads on their existing mainframes and on Google Cloud concurrently without interrupting operations. Enterprises can then perform real-time testing and determine application performance and stability in the cloud. A large challenge with mainframe systems is the tight coupling of data to the application layer. Companies would have to stop an application for some period of time in order to move it, modernize it or transform it, according to Google.To read this article in full, please click here

Calico at KubeCon + CloudNativeCon NA 2022

Tigera is back at KubeCon + CloudNativeCon NA 2022! We’re excited to be back in person and meet new and familiar faces—and we have a lot of exciting Calico updates to share with you.

KubeCon + CloudNativeCon is action-packed as usual, kicking off the week with co-located events. We will be onsite at two co-located events: eBPF Day and Cloud Native SecurityCon. At the main event, KubeCon + CloudNativeCon, we will have a booth that you can visit for cool swag and deep dives with our experts. We will also be teaming up with AWS to bring you a fun party that you won’t want to miss!

Interested in attending? Curious about the party? Want to win some prizes? Read this blog post to find out what we have in store for KubeCon + CloudNativeCon NA 2022.

eBPF Day – October 24

eBPF Day is a vendor-neutral conference that explores the transformational technology that is eBPF, and its impact on the future of cloud native. This event is co-located with KubeCon + CloudNativeCon.

As a speaker at the event, our resident eBPF expert, Tomas Hruby, will demonstrate how to inspect and troubleshoot the eBPF mode of Calico Open Source during Continue reading

Network Break 402: Ex Uber Exec Guilty Of Breach Coverup; Startup Promotes Decentralized Cellular Networks

This week's Network Break podcast discusses new security capabilities from Aryaka, a Cisco/Microsoft partnership, the guilty verdict for Uber's former CSO, a startup tackling decentralized cell networks, and more tech news.

The post Network Break 402: Ex Uber Exec Guilty Of Breach Coverup; Startup Promotes Decentralized Cellular Networks appeared first on Packet Pushers.

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