selftests: net: do not detect PPPoX loopback

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

selftests: net: do not detect PPPoX loopback

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>
Link: https://patch.msgid.link/20260603061746.23452-1-qingfang.deng@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftests: net: add socat syslog for PPPoL2TP

As done in pppoe.sh, start socat as the syslog listener. In case the
test fails, dump its log to see what's going on.

Signed-off-by: Qingfang Deng <qin

selftests: net: add socat syslog for PPPoL2TP

As done in pppoe.sh, start socat as the syslog listener. In case the
test fails, dump its log to see what's going on.

Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
Reviewed-by: Matthieu Baerts <matttbe@kernel.org>
Link: https://patch.msgid.link/20260529021146.5739-1-qingfang.deng@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftests: net: add tests for PPPoL2TP

Add ping, iperf3, and recursion tests for PPPoL2TP.

Assisted-by: Gemini:gemini-3-flash
Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
Link: https://pa

selftests: net: add tests for PPPoL2TP

Add ping, iperf3, and recursion tests for PPPoL2TP.

Assisted-by: Gemini:gemini-3-flash
Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
Link: https://patch.msgid.link/20260514015743.37869-1-qingfang.deng@linux.dev
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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