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Update docs/admin/networking/troubleshooting.md
Co-authored-by: Edward Angert <EdwardAngert@users.noreply.github.com>
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docs/admin/networking/troubleshooting.md

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@@ -95,8 +95,18 @@ the NAT configuration, or deploy an internal STUN server.
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If a network interface on the side of either the client or agent has an MTU
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smaller than 1378, any direct connections form may have degraded quality or
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might hang entirely. `coder ping` will indicate if this is the case by inspecting
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network interfaces on both the client and the workspace agent.
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might hang entirely.
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Use `coder ping` to check for MTU issues, as it inspects
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network interfaces on both the client and the workspace agent:
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```console
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$ coder ping my-workspace
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...
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Possible client-side issues with direct connection:
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- Network interface utun0 has MTU 1280 (less than 1378), which may degrade the quality of direct connections or render them unusable.
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```
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If another interface cannot be used, and the MTU cannot be changed, you may need
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to disable direct connections, and relay all traffic via DERP instead, which

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