Final piece of "connects but no traffic": with the reduced client MTU (1280)
the upload direction fits, but full-size download packets (web pages, TLS
responses) still exceeded the AmneziaWG tunnel and were dropped — handshake
and small packets worked, browsing stalled. Confirmed on a live server: the
client's encrypted packets reached the server but large return packets never
made it back. Adding a server-side TCP MSS clamp to 1240 (= 1280 - 40) made
real traffic flow (verified: 1.6 MiB transferred, FORWARD/MASQUERADE counters
incrementing).
- VpnClient::addClientToServer(): after applying the peer, idempotently ensure
net.ipv4.ip_forward=1 and a `mangle FORWARD ... TCPMSS --set-mss 1240` rule
(-C then -A). Re-applied on every client creation, so it survives container
restarts/reinstalls and covers adopted native Amnezia containers.
- migrations/072 + 064: add the same MSS clamp to the awg2 install script
PostUp (and remove it in PostDown) for panel-installed servers.
Verified end-to-end: removing the rule and creating a client via the panel
re-adds it automatically; the live phone client now browses normally.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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