Steam deck not using lancache

[bfenty]

This is likely an issue with something on the deck as it works perfectly on my windows machines, but the deck doesn't use the cache. I have the domains configured in pihole to forward to my lancache. Deck just ignores the cache. Is there a fix for this?

[OverthinkingTech]

Same issue. Weirdly, the steamdeck finds lancache.steamcontent.com because it shows up in my DNS logs but it also looks for other servers and uses them instead. Attached is a screenshot of DNS showing the steamdeck is finding lancache.steamcontent.com
Blocking all other steam servers does not work in forcing the deck to use lancache. Also, I have tried disabling local file sharing, that had no impact of behavior.

[sgtxd]

This Issue lines up with the Linux Steam Client not utilising lancache.steamcontent.com (ValveSoftware/steam-for-linux#7514)

[archer37]

For what its worth, testing from the Stemdeck today it has no issues connecting to and using LanCache for game downloads. No configuration on the deck necessary, just the network wide entry for lancache.steamcontent.com pointed to the local server, and I am able to hit speeds far in excess of my ISP connection; Proxmox and Grafana validate that the traffic is coming from the Lancache VM.