If a network interface on the side of either the client or agent has an MTU

smaller than 1378, any direct connections form may have degraded quality or

performance, as IP packets are fragmented.`coder ping` will indicate if this is

the case by inspecting network interfaces on both the client and the workspace

agent.

might hang entirely.

If another interface cannot be used, and the MTU cannot be changed, you may need

to disable direct connections, and relay all traffic via DERP instead, which

Use`coder ping` to check for MTU issues, as it inspects

network interfaces on both the client and the workspace agent:

$coder ping my-workspace

If another interface cannot be used, and the MTU cannot be changed, you should

disable direct connections and relay all traffic via DERP instead, which

will not be affected by the low MTU.

To disable direct connections, set the

flag or`CODER_BLOCK_DIRECT` environment variable on the Coder server.

The`coder speedtest <workspace>` command measures the throughput between the