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feat(pmtud/tcp): use the TCP server with highest MSS to run MTU tests

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This commit is contained in:
Quentin McGaw
2026-02-19 14:03:46 +00:00
parent fb85ae79d1
commit 8d86470905
10 changed files with 323 additions and 59 deletions
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internal/pmtud/tcp/tcp_integration_test.go
+8 -3
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@@ -27,12 +27,17 @@ func Test_PathMTUDiscover(t *testing.T) {
}
require.NoError(t, err, "creating firewall config")
dst := netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), 80)
dsts := []netip.AddrPort{
netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), 53),
netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), 443),
netip.AddrPortFrom(netip.AddrFrom4([4]byte{8, 8, 8, 8}), 53),
netip.AddrPortFrom(netip.AddrFrom4([4]byte{8, 8, 8, 8}), 443),
}
const minMTU = constants.MinIPv6MTU
const maxMTU = constants.MaxEthernetFrameSize
const tryTimeout = time.Second
mtu, err := PathMTUDiscover(t.Context(), dst, minMTU, maxMTU, tryTimeout, fw, noopLogger)
mtu, err := PathMTUDiscover(t.Context(), dsts, minMTU, maxMTU, tryTimeout, fw, noopLogger)
require.NoError(t, err, "discovering path MTU")
assert.Greater(t, mtu, uint32(0), "MTU should be greater than 0")
t.Logf("discovered path MTU to %s is %d", dst, mtu)
t.Logf("discovered path MTU is %d", mtu)
}