NethServer Version: 7.7.1908
Greetings. There was a need to limit the Internet speed for 1 IP. How can I do that?
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You have to set QoS
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Have a look here: http://docs.nethserver.org/en/latest/firewall.html#traffic-shaping
I think this is what you’re looking for.
EDIT:
To set the connection speed in cockpit, go to firewall/WAN and click on the red interface, if not already done. 
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In this times Internetspped is limited by them self an by virus only a joke.
You need QoS -> Quality of service
So can limit by IP or by service.
This function is part of your router (normaly)
Your router can be a part of Neth …
I am using a external one
I need to restrict the IP that is on the GREEN network.
P.S.
I could not find QoS in NS.
Hello Valeriy
Ntopng shoud be the package. Nomaly it is a part of the router.
but never try it 
I am using a AVM 7590 VDSL Modem and router, it is a part there…
1st create a class like this:
Limit bandwith to i.e. 50%
2nd create a rule like this:
Leave service clear to set ANY.
Now the IP you specified in Source is limited to 50%. Also possibel to give “kbit” in class.
If you want to limit the hole green network, give green as source.
Traffic shapping = fireQoS = QoS = Quality of Sevice. Config file is in /etc/firehol/fireqos.conf
You can specify min and max rates there. In this case you want to give a max rate IIUC.
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Where exactly should I do this?
Goto to applications, open firewall settings, goto Traffic Shaping
1st crerate a class / 2nd create a priority rule
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Did you set up- and download bandwidth to te real values in firewall/WAN? => see red aroows in the pic.
Without that traffic-shapping won’t work.
I assume you did apply the rules before testing.
I tested this and it works, so there must be a missconfiguration at your system.
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Thanks for the help. Now everything works!
P.S.
This must be added to WIKI.
Do you think that documentation on that is not enough?
https://docs.nethserver.org/en/v7/firewall2.html