Security on Daniel 'f0o' Preussker

Oubliette: A Linerate eBPF/XDP DDoS Scrubber

Fri, 17 Apr 2026 00:00:00 +0000

It’s been some time since I wrote something. Not because I got lazy but because I’ve been cooking something up in the lab that I just can’t wait to share.

Late Q2, I’ll be publishing a new open-source project called oubliette. It’s a linerate DDoS scrubber, and I promise you, it’s pretty neat.

I’ve been dealing with DDoS attacks for what feels like a lifetime. The ones that always get me riled up are TCP SYN Floods with spoofed IPs.

BGP Hijacking and other nuisances

Thu, 27 Jun 2024 00:00:00 +0000

Honestly where to even begin… All of my research runs on my own ASN and through 2-3 prefixes that I operate. Being my own ISP gives me the flexibility and mobility required to do possibly stupid things without upsetting or interrupting any potential upstream/provider.

Now that we’re on the same page let’s go to the juicy stuff.

The internet runs as a bunch of loosely connected independent networks, each identified by their ASN (Autonomous System Number - catchy right?). While there are many ways to exchange routes between two networks the one used by “The Internet” is BGP (Border Gateway Protocol); It really isn’t that important as ultimately all protocols rely on Trust alone.

SafePal S1 Ramblings

Mon, 14 Jun 2021 00:00:00 +0000

So I picked this relatively new cryptowallet “SafePal S1” for literally peanuts which immediately made me wonder how good it actually can be…

First of all I’m very happy to see that cryptowallets become more accessible and cheaper, this is generally a good trend but I’m ofc also concerned by the means on how they got the price so low (we’re talking about 50USD here).

One thing I noticed immediately was that this wallet is extremely small and light. It’s the size of a credit-card and as wide as perhaps a stack of 5 cards.