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The mesh's interface takes over the found tunnel's MTU

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Carries MTU from the reported tunnel (mesh-host#28) through inventory,
the overlay graph's TakeOver, into the generated config's [Interface].
A tuned path keeps its MTU across the takeover instead of regressing to
1420 and hanging transfers no ping would reveal. Two emit tests; a
tunnel with no MTU writes no line.
This commit is contained in:
jschoubben
2026-09-26 22:40:42 +02:00
parent 50878a9d98
commit 7fc5fd02fd
7 changed files with 38 additions and 3 deletions
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internal/overlay/declaration_test.go
+23
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@@ -286,3 +286,26 @@ func TestANodeWithNoTunnelAndNoEndpointStillListensOnNothing(t *testing.T) {
t.Fatalf("a dial-only node needs no ListenPort:\n%s", config)
}
}
func TestATakenTunnelCarriesItsMTU(t *testing.T) {
// A path tuned to a smaller MTU (1380 here) must survive the takeover — the mesh interface
// comes up with the same MTU, or transfers hang silently (novox/hq: a taken tunnel carries
// its MTU).
config, _ := declarationFor(t, Node{
Name: "shanks", Key: "SPOKE", Address: "10.10.0.3",
TakesOver: &TakeOver{Interface: "wg0", Port: 51820, MTU: 1380},
}, nil)
if !strings.Contains(config, "MTU = 1380") {
t.Fatalf("the tuned MTU was dropped:\n%s", config)
}
}
func TestNoMTULineWhenTheTunnelSetNone(t *testing.T) {
config, _ := declarationFor(t, Node{
Name: "shanks", Key: "SPOKE", Address: "10.10.0.3",
TakesOver: &TakeOver{Interface: "wg0", Port: 51820},
}, nil)
if strings.Contains(config, "MTU") {
t.Fatalf("no MTU was found, so none should be written:\n%s", config)
}
}