Nikola Bura: Blog Imagine disabling JavaScript
Posts with the tag sysadmin:

Logging Wireguard Connections with bpftrace

At my company, we run a Wireguard server for VPN access, specifically Firezone. While we’re quite happy with it so far, one missing feature (though I’ve heard they’re working on it for the paid tier!) is more robust logging. In particular, I’d like it so that we can log all the remote IP addresses for a given user.

Writing DawgCTF 2022: The DN41/DN43 Fwn Chals

I was on the challenge authors team for DawgCTF 2022, the UMBC Cyberdawgs' annual competition, last weekend. We had a few hundred players, mostly from the USA, but there were plenty of international teams competing as well (congrats to the winners, neuland, H0o, and idek).

Socat Shenanigans: Publishing OpenVPN Status

The UMBC System Administration and Software Development (SAD) Club runs a pfSense VM with OpenVPN installed. For our internal splash page, I thought it would be kind of cool if it automatically determined, based on the request’s IP address, your username.

Reformatting 520-byte NetApp drives for use in a PERC 6/i, by using an HP P410i card in HBA mode

I recently bought some cheap “NetApp X417A-R6” SAS drives on Ebay - NetApp X417A-R6 900GB 2.5" SAS ST900MM0036, specifically. Come on, a 900GB 10k RPM SAS drive for $12.50 seemed like a good deal to me. Intro The problem, it turns out, is that these NetApp drives have 520-byte sectors, while my R610’s PERC 6/i RAID controller apparently only takes “standard” sector sizes such as the more common 512-byte.

Color Coded Host Indicating Shell Prompt

Do you often SSH around a bunch of different hosts? I found that with several terminals open, I was easily losing track of which host I was looking at; even with the hostname displayed in the prompt, it takes a second to read it.