Packets DownRange
Internet Service provider topics, Network operations, and other topics. Some topics include Mikrotik, Cisco, Arista and other configurations.
So, due to Covid, weather and everything else I am quite behind on blog updates and such. this is one that kinda fell through the cracks. I meant to get this out much sooner than now. My buddy Schylar Utley has a pretty cool projects for optimizing CPE deployments and such. Check them out at … Read more
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There always is a lot of talk about Mikrotik RouterOS CPU usage. I wanted to take a few minutes and go over a real-world example and explain some of the ins and outs when discussing Mikrotik CPU usage. Let’s talk about the router in question. This is a CCR1016-12s-1S+. This is a 16 core 1.2GHz … Read more
Recently I had an issue with mounting older CD-Roms of backup files and such on MacOSX Catalina. Apparently, Apple dropped support for HFS volumes. In order to fix this it is pretty easy. You will need HomeBrew. Being a network geek I already have this installed. If you need to install this here is a … Read more
I remember using this when designing web-pages years ago. It was all the rage to put browser buttons like this at the bottom.
https://docs.preseem.com/changes Features IPv6 Preseem now supports IPv6 for all use cases. This includes the ability to assign subscribers a prefix of arbitrary length. IPv4 with Prefixes of Arbitrary Length Previously Preseem modelled subnet assignments to customers as a number of /32 assignments. For example a subscriber who was assigned a /30 would result in four … Read more
I just finished up an article over on the FD-IX blog about local-prefs, default routes, and Internet exchanges. https://www.fd-ix.com/uncategorized/local-pref-and-default-routes/ Not everyone on the Internet needs full feeds from their provider. In this case, how does learning routes from an Internet Exchange such as FD-IX benefit you if all you are doing is default routes? So … Read more
The following is from http://routing.he.net/algorithm.html . This outlines the criteria HE.NET uses for filtering routes from peers and customers. This is the route filtering algorithm for customers and peers that have explicit filtering: 1. Attempt to find an as-set to use for this network.1.1 Inspect the aut-num for this ASN to see if we can … Read more
For those of you implementing Syslog triggers and such the following list will be helpful in filtering and classifying Syslog entries. 0 – Emergency 1 – Alert 2 – Critical 3 – Error 4 – Warning 5 – Notice 6 – Informational 7 – Debug
Anyone who follows me knows I am a big fan of switch centric designs. This usually involves a router on a stick paired with a high port count switch. Recently I had a client that installed a Preseem appliance in their network. Equipment used in this setup-Dell R710 with a 4 Port SFP+ card running … Read more
