j2sw j2sw.com has a new look! It was time for a refresh and a better way to bring my projects, writing, and other corners of the Internet together. The updated homepage includes my book, Kid’s First Visit to an Internet Exchange, links to Packets DownRange, and a media section with YouTube, Patreon, and my Amazon Author … Read more
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J2 Networks joins MANRS, the Mutually Agreed Norms for Routing Security initiative, reinforcing our commitment to a more secure Internet. MANRS is a global initiative that helps reduce common Internet routing threats through practical actions and cooperation among network operators. Joining this community reinforces our commitment to responsible network operations and a more resilient Internet. … Read more
Three in the morning, another alarmSomething went down, time to bring it back onlineRouters are screaming, the logs are redAnother long night in the data center ahead
For years, the normal answer was a VPN with a management network. VPNs work well, but they require another server, another set of credentials, another client to maintain, and another service that can break during upgrades. With Cloudflare Zero Trust, instead of opening management ports to the Internet, the router stays on a private network … Read more
I, due to recent SSH vulnerabilities in MikroTik, figured this series of articles would be relevant. The router may have strong passwords and firewall filters, but those services still receive constant login attempts from automated scanners. For years, the normal answer was a VPN with a management network. VPNs work well, but they require another … Read more
Let’s look at another BGP attribute, the Multi-Exit Discriminator, or MED. Two networks may interconnect in more than one location, and MED lets you attach a preference to the routes you advertise. An ISP might connect to the same upstream in Indianapolis and Chicago while advertising the same prefixes at both locations. The upstream now … Read more
The following is from the 7.23.7 changelog. What’s new in 7.23.7 (2026-09-16): *) lte – prevent the modem firmware from being deleted for RBSXTLTE3-7, EC25-EU&KNe, EG25-G&KNe, EC25-EU&SXTsq, EG25-G&SXTsq (introduced in 7.23.6); If you have already upgraded to 7.23.6 or 7.24.3, follow these steps to restore LTE functionality on affected devices: For more details, see:https://forum.mikrotik.com/t/warning-lte-interface-stops-working-after-upgrade-to-7-23-6-7-24-3
What it looks like when an intruder tries to make your own router work against you. A note before we start: Anything in this post that could identify my network, my organization, or my router’s real hostname and IP address has been redacted or made generic. The attacker’s own infrastructure, such as IP addresses, ports, … Read more
To the product teams, support organization, partners, and remaining employees of Cambium Networks: First and foremost, my heart goes out to you during these tough, uncertain times. Over the past couple of years, Cambium has taken a beating in the forums and groups. Those of us who understand how the world works always knew that … Read more
Have you ever looked at a data center marketing slick and wondered what N, N+1, 2N, and 2(N+1) actually mean? The main thing they tell you is how many components can fail before the system drops below the capacity needed to support the load. When I evaluate a data center, I want to know what … Read more
