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Client IP address

# Client IP address
$remote_addr

Get client IP address from header​

For Nginx behind proxy, use Real IP address

Map IP address​

Map IP address to value

geo [$<address>] $<variable> {
    [default <value>;]
    [<IP address> <value>;]
    [<CIDR> <value>;]
}

geo $local {
    default         0;
    10.0.0.0/8      1;
    192.168.0.0/16  1;
}

if ($local) {
    # ...
}