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The nc cmd(nmap-ncat) that distributed with Fedora/Red Hat does not have option -q. This make some tests failed with: nc: invalid option -- 'q' Let's switch to socat which is far more dependable. Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>