forward

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tcp udp forward

[
    {
        "listen": "tcp6://[::1]:20000",
        "to":     "tcp://127.0.0.1:20001",
        "maxIdleDru":     "1min",
        "accept": ["::1/128"]
    },
    {
        "listen": "tcp4://127.0.0.1:20002",
        "to":     "tcp://127.0.0.1:20003",
        "accept": ["127.0.0.2/32"]
    },
    {
        "listen": "udp://127.0.0.1:20000",
        "to":     "udp://127.0.0.1:20001",
        "accept": ["127.0.0.1/32"]
    },
    {
        "listen": "udp://127.0.0.1:20004",
        "to":     "udp://127.0.0.1:20005",
        "accept": ["127.0.0.2/32"]
    }
]