Linux – Ian's notes

Debian 11 “Bullseye” failing to connect to network with Intel XL710 10GbE adapter

Having taken delivery of a brand new server with an XL710 card in it, I booted it up after setting up the DHCP reservation, and while the reservation for the dedicated BMC/IMPI interface kicked in immediately, it failed for the interfaces on the XL710 adapter.

Fixing the SSH forwarding error “administratively prohibited: open failed”

Attempting to forward a PostgreSQL port from a remote server to localhost, I saw the following error in the SSH client log:

In-depth tech talks

I’ve found that some tech talks and lectures are worth rewatching from time to time, usually because they’re information-dense and require a bit of research or hands-on participation from the viewers perspective to get a full understanding of the content. Here’s a few of my favourite, in-depth talks:

Forwarding a port from an LXC host to an LXC guest via Shorewall

This guide relies on the configuration discussed in Setting up Shorewall for LXC container network bridging and routing.

Granting restricted SSH access for the purposes of port forwarding only

To grant restricted access to a server for the purposes of forwarding a port on the user’s local machine (e.g. PostgreSQL), do the following:

Setting up Shorewall for LXC container network bridging and routing

Host instructions for LXC

Ensure that the LXC bridge is enabled:

Fixing a purple/green colour effect during gamma adjustments using the Nvidia driver on Linux, and enabling the RGB colour space and full colour range

I had a peculiar problem where the colours on my Television looked washed out when connected to my Nvidia GTX 960. I’m using the proprietary drivers, and tried a few different driver versions to see if that helped, but in the end that didn’t seem to be the problem.

Category Archives: Linux