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F11-TS: No

Rationale

DERP drops packets for an unavailable destination and drains queued packets when a client disconnects. These are live forwarding queues, not storage for deferred delivery.

Assessment method

Official documentation and pinned source inspection; no runtime test

Source context

Tailscale control plane and DERP source 566f89e0fb2aa4b2f1ebf98761e45e62aa5ef225

Outstanding qualification

Source witness: handleFrameSendPacket and stopWriter. No additional messaging application is selected.

Public sources

• https://raw.githubusercontent.com/tailscale/tailscale/566f89e0fb2aa4b2f1ebf98761e45e62aa5ef225/derp/derpserver/derpserver.go
• https://tailscale.com/docs/concepts/control-data-planes
• https://raw.githubusercontent.com/tailscale/tailscale/566f89e0fb2aa4b2f1ebf98761e45e62aa5ef225/derp/README.md
• https://raw.githubusercontent.com/tailscale/tailscale/566f89e0fb2aa4b2f1ebf98761e45e62aa5ef225/derp/derp.go
• https://raw.githubusercontent.com/tailscale/tailscale/566f89e0fb2aa4b2f1ebf98761e45e62aa5ef225/derp/derpserver/derpserver.go

Editorial evidence references

The following identifiers refer to research records not included in this public package; they are not public links.

• round586.html
• round586-sources.json