The title of this post refers to a network function commonly known as duplicate address detection (DAD). The complete story will cover a range of seemingly unrelated technologies including ARP, Perl socket programming, systemd, IPv6, and a once-popular LAN technology that if you’ve never seen you probably never will, Token Ring. It all starts with a fake DNS server. Oh yeah, I forgot to mention DNS is here as well, but that is just a happy coincidence.Read more...
“DNS over TCP is a thing, please don’t block it. kthxbye.” That is how I whimsically tweeted my summary of IETF RFC 9210, a new BCP co-authored with Duane Wessels. The history of the document is rooted in a chance encounter over seven years ago. For posterity, here is my version of how it came to be.
In December 2014, a former student informed me of an interaction with another instructor where my name had come up.Read more...
My first ThinkPad was the 600e with 128 MB of RAM. In 2000 I wiped out Windows NT that came with it and installed Mandrake. A couple years later I switched to Debian and I’ve been using that as my preferred OS ever since. My most recent ThinkPad is the P15 Gen2. As of this writing there is not a Wikipedia page for it. This is a brief record of my experience getting Debian running on the P15.Read more...
The NANOG 83 meeting took place earlier this month. Excluding the hackathon, it was approximately five hours of content each day for three days. Slide decks for all the talks are on the meeting page already and the videos are on the TeamNANOG YouTube channel. This is a very brief, likely imperfect summary of the technical talks from the meeting.
Day 1 Famous Internet Outages
Avi Freedman, Doug Madory, Jared Mauch, John Kristoff (moderator)Read more...