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Last post: Jan 11, 2021
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My ISP Is Killing My Idle SSH Sessions. Yours Might Be Too.
Jan 11, 2021 · original
tl;dr: My ISP’s CGNAT session timeout is too short, meaning TCP keepalives gets dropped. Test if your own NAT, or your ISP’s CGN, violates RFC5382 ‘s REQ-5 using this tool: https://github.com/AndersTrier/NAT-TCP-test . I have been working from home more lately, where I have SSH sessions open to the servers that I’m working on. Often when I return to my computer, or switch to a SSH session that has been sitting idle for a while, the SSH connection is either dead or frozen. If the session is not already dead, the only way to gain control over my terminal again, is to send the ‘terminate connection’ ssh escape sequence enter~. after which SSH errors like this: ato@mirrors.dotsrc.org:~$ client_loop: send disconnect: Broken pipe This happened one day while I was transferring a VM image in the hundreds of gigabytes from one server to another using netcat like so: ato@host2:~$ nc -l 1337 hugefi
Using an iPod with a damaged hard drive
Mar 22, 2019 · original
e29616 , CC BY 2.0 , via Wikimedia Commons I recently bought an used iPod Classic 6th gen. While the storage capacity on the backside is specified to be 80 GB, I was only able to copy around 20GB of data to the hard drive before the iPod would shut itself off. Lets fix that. The iPod can boot in “emergency disk mode” , which boots a minimal OS that just exposes the internal hard drive over USB. I’ll use this mode in the rest of this post, as I figure that what I do won’t be disturbed by any software on the iPod. To confirm the problem, I tried writing zeros all over the drive, and as expected, after writing 18 GB, the iPod crashed. # dd if=/dev/zero of=/dev/sda bs=512K oflag=sync dd: error writing '/dev/sda': Input/output error 34285+0 records in 34284+0 records out 17974689792 bytes (18 GB, 17 GiB) copied, 1065.78 s, 16.9 MB/s # dmesg [80318.901496] sd 2:0:0:0: [sda] tag#0 FAILED Result
Using Google’s BBR congestion control on Ubuntu Server 16.04
Sep 7, 2017 · original
Most current congestion control algorithms rely on packet loss as the signal to slow it down. According to [1] this is ill-suited for todays modern networks. The BBR congestion control algorithm, is an alternative used by Google, designed so it “reacts to actual congestion, not packet loss or transient queue delay, and is designed to converge with high probability to a point near the optimal operating point.”. [1] To use BBR on Ubuntu 16.04, first step is to make sure your kernel is =4.9. If your kernel is 4.4 (as mine were), the best way to get a newer kernel, is to enable Ubuntu’s “LTS Enablement Stack”. [2] This is on Ubuntu server 16.04 simply done with: # apt install --install-recommends linux-generic-hwe-16.04 For me, this installed 4.10.0. Next we need to enable BBR for congestion control, but we also need to change the packet scheduler to fq [3] (though not required since patch [

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