Slow internet speeds after installing Hamachi

Hi,

I tried out Hamachi and noticed it slows down my internet, even when not connected.

I found the fix, for this which sorted out my download speeds, but would like to know:

Is it a 1 time fix or do I need to keep doing it?

Thanks

This worked perfectly 😃

I worked for me too, thanks a lot but the upload speed got cut in about half after I applied the netsh commands. If there is a fix for this asw please tell us, if not i guess we`ll just have to wait for the next update.

Thanks 🙂

Glad our technical investigations were of help to others 🙂

I think Hamachi are aware. One of my mates also posted the problem/solution on the forums, and if I remember correctly, he got an answer from one of the Hamachi employees stating they would fix it in some upcoming release. I believe, this was a few weeks ago (and pretty long after we posted).

But my Upload is still slow since i installed Hamachi, what can fix this?

You are my Hero, finally i found the issue after i already reinstalled windows! 
But my Upload is still broken, should be on 50 Mbps and its on 10Mbps - any solving on this?

We need to bring this information to Hamachi, it caused on both of my installations this issue! 

THANKS!

Hi everyone,

I apologize for the delays, and expect the next version to have native API calls instead of netsh background configurations.  Until that time (as mentioned previously), you can run the following commands to resolve:

netsh int tcp set global autotuninglevel=normal
+
netsh int tcp set global rss=enabled

This seems to be a bug (or feature?) that other people, including myself, have had.  My Internet speed before installing is 200.  After installing is 50.  After UNINSTALLING is still 50.  You have to manually un-do the changes made to your computer that Hamachi made.

Here is the solution:

https://community.logmein.com/t5/LogMeIn-Hamachi-Discussions/Installing-Hamachi-slows-my-internet-speed/m-p/217907#M18346

This solution works for me.  Internet went back to 200 after doing this.

I REALLY wish that LogMeIn support would chime in officially regarding this.  I have not contacted them myself, but someone else in that thread did, and they reported that support would not acknowledge it.

Mate thx for the fix my internet in games was so bad I went from gigabit 0 ping to damm like 100 ping the last time this happened I had to reinstall everying from a factory reset this fix I'm gonna keep in a txt file if you don't mind

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Style1 wrote:

My cousing had been troubleshooting this for a few days and after starting to get involved in the troubleshooting the same problem occured on my main computer as well. There was no chance to increase the download above 1.3MBs (got 200/200 connection), unless downloading from a service that uses swarm tech (i.e Steam, Origin etc).

 

After backtracking we came back to Hamachi and this thread. We finally found the solution that worked for us. It seems installing Hamachin changes the TCP Global Parameters. To check/fix this, do the following:

 

SOLUTION:

Start -> Run -> CMD (as administrator to buypass the UAC)

then type the following command to show what parameters your current TCP has:

netsh interface tcp show global

This should give you a list over the TCP parameters, the ones Hamachi seems to change are these two:

Receive-Side Scaling State & Receive Window Auto-Tuning Level. Recieve-Side Scaling State was set to 'disabled' and Recieve Window Auto-Tuning Level was set to 'disabled'

 

Type the following commands in the CMD to change this:

netsh int tcp set global autotuninglevel=normal (Response should be OK.)

netsh int tcp set global rss=enabled (Response should be OK.)

 

Reboot shouldn't be needed after, but if you encounter problems do it. We didn't test Hamachi after this because we uninstalled it so I don't know how it works after this change.

 

I have no idea why Hamachi changes these parameters on some/all computers? When we checked other hosts in our network running the same OS without hamachi these parameters where unchanged and download speed OK.

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