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selftests: net: do not detect PPPoX loopback

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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: 7af2a94f4d ("selftests: net: add tests for PPPoL2TP")
Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
Link: https://patch.msgid.link/20260603061746.23452-1-qingfang.deng@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Qingfang Deng 2026-06-03 14:17:44 +08:00 committed by Jakub Kicinski
parent b64f763b60
commit 2eb9a81a7f
1 changed files with 1 additions and 0 deletions
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tools/testing/selftests/net/ppp/pppoe-server-options
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@ -1,2 +1,3 @@
noauth
noipdefault
nomagic