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I am able to get current upload and download rate, but how do I get the max upload and download rates for the network interface I am using, in *nix systems?

For example, Windows shows network usage in percent, as shown below:

enter image description here

EDIT: In other words, as one of the answers mentioned that Windows shows the utilization of my network hardware. I would like to know the same in Linux, how do I do it?

This will be very useful to know if my network adapter is causing the bottleneck.

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Windows calculates network usage as a percentage of the link speed of your internet connection (like 45 or 150Mbps). This simply measures the utilization of your network hardware and is not a measure of available bandwidth. Hence not a good method to check if network is the bottleneck in your scenario.

However, if this is exactly what you want, find out the link speed as described in this answer. (change eth0 to appropriate interface)

dmesg | grep eth0

Using this value and your current speeds, you can estimate the network utilization.
Hope this clears your doubt.

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To check your link speed you can run lshw -C Network

lshw -C Network
WARNING: you should run this program as super-user.
  *-network               
       description: Ethernet interface
       physical id: 1
       logical name: internet0
       serial: b8:27:eb:6f:c7:75
       size: 100Mbit/s
       capacity: 100Mbit/s
       capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=smsc95xx driverversion=22-Aug-2005 duplex=full firmware=smsc95xx USB 2.0 Ethernet ip=192.168.178.56 link=yes multicast=yes port=MII speed=100Mbit/s
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.

To check the actual up and download usage i use bmon

enter image description here

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