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Set net.ipv4.tcp_mtu_probing to 2

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> Forces every new TCP socket to begin at a
> conservative MSS
> (min(path MTU, 1024 bytes) – 40).
> Immediately sends progressively larger probes
> and raises the MSS as soon as they’re ACKed.

This has been found to solve very slow deploys
with Tailscale, Kamal and our internal Docker
registry.
This commit is contained in:
Lewis Buckley 2025-08-20 12:24:18 +01:00
parent bd2eddbab4
commit 3e4597b89c
No known key found for this signature in database
2 changed files with 3 additions and 2 deletions
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4
install/config/config.sh
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@ -29,8 +29,8 @@ sudo sed -i 's|^\(auth\s\+\[default=die\]\s\+pam_faillock.so\)\s\+authfail.*$|\1
# Set Cloudflare as primary DNS (with Google as backup)
sudo cp ~/.local/share/omarchy/default/systemd/resolved.conf /etc/systemd/
# Solve common flakiness with SSH
echo "net.ipv4.tcp_mtu_probing=1" | sudo tee -a /etc/sysctl.d/99-sysctl.conf
# Solve common flakiness with SSH and Tailscale performance
echo "net.ipv4.tcp_mtu_probing=2" | sudo tee -a /etc/sysctl.d/99-sysctl.conf
# Set common git aliases
git config --global alias.co checkout

1
migrations/1755244361.sh Normal file
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@ -0,0 +1 @@
sudo sed -i 's/^net.ipv4.tcp_mtu_probing=1/net.ipv4.tcp_mtu_probing=2/' /etc/sysctl.d/99-sysctl.conf