dante.conf

user.privileged: proxy

# when running as usual, it will use the unprivileged userid of:
user.notprivileged: nobody

logoutput: stderr
#logoutput: syslog
#the above line will send any logs to /var/log/syslog instead to a terminal

internal: eth0 port = 1\9090
internal: 127.0.0.1 port = 9090

external: eth0

method: username none

client pass {
        from: 136.201.251.21/0 port 1-65535 to: 0.0.0.0/0
        # 136.201.251.21/0 = specific ip address.
} 

client pass {
        from: 127.0.0.0/8 port 1-65535 to: 0.0.0.0/0
}

client block {
        from: 0.0.0.0/0 to: 0.0.0.0/0
        log: connect error
}

#Finally block other traffic
block {
  from: 0.0.0.0/0 to: 127.0.0.0/8
  log: connect error
}

pass {
  from: 136.201.251.21/0 to: 0.0.0.0/0
  protocol: tcp udp
}

pass {
  from: 127.0.0.0/8 to: 0.0.0.0/0
  protocol: tcp udp
}

block {
  from: 0.0.0.0/0 to: 0.0.0.0/0
  log: connect error
}