selftests, bpf: test_tc_tunnel.sh nc: Cannot use -p and -l
When run test_tc_tunnel.sh, it complains following error ipip encap 192.168.1.1 to 192.168.1.2, type ipip, mac none len 100 test basic connectivity nc: cannot use -p and -l nc man page has: -l Listen for an incoming connection rather than initiating a connection to a remote host.Cannot be used together with any of the options -psxz. Additionally, any timeouts specified with the -w option are ignored. Correct nc in server_listen(). Signed-off-by: Vincent Li <vincent.mc.li@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20210719223022.66681-1-vincent.mc.li@gmail.com
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