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In this article, we will learn how to limit the outgoing bandwidth of Bitcoin Core formerly Bitcoin-qt , so we can leave it listening in the background without completely saturating our internet connection. To do this, your internet connection needs to be able to accept incoming connections on TCP port After you have the port forwarded for a few hours, however, you may notice your internet connection becoming unresponsive for other things like web surfing.
Some routers support QoS, which is a way of prioritizing important traffic like web browsing over baseline traffic like bitcoin traffic. If your router supports QoS, then you should use it instead of following this guide to limit bandwidth — this guide is for those of us whose routers choke up when Bitcoin Core is running. If you limit the bandwidth of Bitcoin Core far below your actual upload speed, it can actually harm the Bitcoin network instead of helping it.
To be a responsible maintainer of the Bitcoin network, you should test your upload speed and then set your outgoing bandwidth limit to be as close to your actual speed as possible e.
This guide is intended solely for people whose internet connections go unresponsive due to Bitcoin Core completely saturating their upload bandwidth. On Windows, there are a few choices available for limiting the bandwidth of an application. The free version of NetBalancer allows the user to limit the bandwidth of up to 3 apps at once, and since we only need to limit bandwidth on one app Bitcoin Core , NetBalancer will be sufficient for this tutorial.
In OS X versions before In OS X Apple provides their own method of limiting bandwidth for developers Network Link Conditioner , but unfortunately it affects the network speed system-wide, rather than allowing the user to choose which apps to throttle. The result is that on OS X For OS X Save your edit, exit the profile manager, choose your new profile, and flip the big switch to enable the limiter:. We want to limit outgoing traffic on TCP Port Alternatively, if you want a simple way to control the overall system bandwidth limit instead of just Bitcoin Core, follow the instructions above for OS X Make sure you have tc installed by typing tc at the command line.
Open the script in a text editor. My computer is connected wirelessly through wlan1 , so the IF line of my tc. This line is there to make a bandwidth exception for port communications within your local network i.
Leave the rest of the commands in tc. The final top section of my tc. Optionally, you can set the script to run every time you start your computer.
Instructions for running scripts on boot will vary depending on your Linux distribution. Hope you enjoyed this tutorial, and please leave any thoughts in the comments! Please enable JavaScript to view the comments powered by Disqus.