* [PATCH net-next] selftests: net: do not detect PPPoX loopback
@ 2026-06-03 6:17 Qingfang Deng
0 siblings, 0 replies; only message in thread
From: Qingfang Deng @ 2026-06-03 6:17 UTC (permalink / raw)
To: David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
Simon Horman, Shuah Khan, Qingfang Deng, linux-ppp, netdev,
linux-kselftest, linux-kernel
Cc: Matthieu Baerts
By default, pppd attempts to detect loopbacks on the underlying
interface using a pseudo-randomly generated magic number and checks if
the same value is received. The seed for the PRNG is a hash of hostname
XOR current time XOR pid, which is likely to collide on NIPA, causing
false positives. Disable magic number generation.
Reported-by: Matthieu Baerts <matttbe@kernel.org>
Fixes: 7af2a94f4dcf ("selftests: net: add tests for PPPoL2TP")
Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
---
tools/testing/selftests/net/ppp/pppoe-server-options | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/net/ppp/pppoe-server-options b/tools/testing/selftests/net/ppp/pppoe-server-options
index 66c8c9d319e9..cd586be7061b 100644
--- a/tools/testing/selftests/net/ppp/pppoe-server-options
+++ b/tools/testing/selftests/net/ppp/pppoe-server-options
@@ -1,2 +1,3 @@
noauth
noipdefault
+nomagic
--
2.43.0
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2026-06-03 6:17 [PATCH net-next] selftests: net: do not detect PPPoX loopback Qingfang Deng
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