Packets DownRange
Internet Service provider topics, Network operations, and other topics. Some topics include Mikrotik, Cisco, Arista and other configurations.
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
For those of you starting out in the WISP field here is a good overview of a scalable Ip scheme for your WISP network. There are some caveats to this, which we will discuss later. This does not address IPV6, I have done some articles on IPv6 in the past that addresses IPV6. Some benefits … Read more
This content is for Patreon subscribers of the j2 blog. Please consider becoming a Patreon subscriber for as little as $1 a month. This helps to provide higher quality content, more podcasts, and other goodies on this blog.To view this content, you must be a member of Justin’s Patreon Unlock with PatreonAlready a qualifying Patreon … Read more
Follow me on Instagram for technology, and sometimes not technology, related photos. @j2sw
This content is for Patreon subscribers of the j2 blog. Please consider becoming a Patreon subscriber for as little as $1 a month. This helps to provide higher quality content, more podcasts, and other goodies on this blog.To view this content, you must be a member of Justin’s Patreon Unlock with PatreonAlready a qualifying Patreon … Read more
Recently I came across a need to do some port forwarding for wifi calling. I have assembled a resource guide to help you if you need to do such things. IPSEC should be allowed per RFC 5996 https://tools.ietf.org/html/rfc5996 for all wifi calling Verizonhttps://community.verizonwireless.com/t5/Verizon-Wireless-Services/What-are-the-wifi-calling-firewall-ports-and-destination-IP/td-p/1080659UDP ports 500 and 4500 open to sg.vzwfemto.com and wo.vzwwo.com TMobilehttps://www.t-mobile.com/support/coverage/wi-fi-calling-on-a-corporate-networkIPv4 Address Block: 208.54.0.0/17 and … Read more
