I have the NAS. Transmission is running on it. I like setting port rules on my router to make the BT service visible from the public network.

The problem is IPv6 is not working on it. So I just disabled IPv6 on Ubuntu Linux.

First I sign in to the server through putty.

Run command ip address

IPv6 address

The 2001:270…. is the IPv6 address of this server.

Edit /etc/sysctl.conf file.

Add the following to the end of the file.


Then run the command to make it effective.

sudo sysctl -p

At the last, I check the IP address.

IPv4 only.

There is no more IPv6 ip address.

On the Transmission Web Control Panel, I test the port.

Test the port. It is Open.


David Yin

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