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There are a couple of options:

1. Take the interface down:

   /sbin/ifconfig eth0 down
   /sbin/ifconfig wlan0 down
   

and to bring it back up:

    /sbin/ifconfig eth0 up
    /sbin/ifconfig wlan0 up

2. You could add a rule to your firewall using either UFW or iptables directly. UFW will block most incoming traffic by default.

3.  

   If using Ethernet you could pull the cable, or if using an external WiFi dongle remove it.

The first is probably easier, but the second will allow you to allow/disallow traffic by IP address, port, protocol etc.

You don't mention what model Pi you are using, but a better long term solution may be to get a second Pi that you can dedicate to just the video, or a model 3B, which may provide better performance because of its upgraded processor - compared to other models.

There are a couple of options:

1. Take the interface down:

   /sbin/ifconfig eth0 down
   /sbin/ifconfig wlan0 down
   

and to bring it back up:

    /sbin/ifconfig eth0 up
    /sbin/ifconfig wlan0 up

2. You could add a rule to your firewall using either UFW or iptables directly. UFW will block most incoming traffic by default.

   You will need to install UFW first:

   sudo apt-get install ufw
   

   then enable it:

   sudo ufw enable
   

   then to block a specific port:

   sudo ufw deny 53
   

   you can remove thepreceeding rule with this command:

   ufw delete deny 53
   

   you may also need to restart UFW after changing the rules:

   sudo service ufw restart
   

More information on using UFW can be found here

3. If using Ethernet you could pull the cable, or if using an external WiFi dongle remove it.

The first is probably easier, but the second will allow you to allow/disallow traffic by IP address, port, protocol etc.

You don't mention what model Pi you are using, but a better long term solution may be to get a second Pi that you can dedicate to just the video, or a model 3B, which may provide better performance because of its upgraded processor - compared to other models.

There are a couple of options:

1. Take the interface down:

   /sbin/ifconfig eth0 down
   /sbin/ifconfig wlan0 down
   

and to bring it back up:

    /sbin/ifconfig eth0 up
    /sbin/ifconfig wlan0 up

2. You could add a rule to your firewall using either UFW or iptables directly. UFW will block most incoming traffic by default.

3. If using Ethernet you could pull the cable.

The first is probably easier, but the second will allow you to allow/disallow traffic by IP address, port, protocol etc.

You don't mention what model Pi you are using, but a better long term solution may be to get a second Pi that you can dedicate to just the video, or a model 3B, which may provide better performance because of its upgraded processor - compared to other models.

There are a couple of options:

1. Take the interface down:

   /sbin/ifconfig eth0 down
   /sbin/ifconfig wlan0 down
   

and to bring it back up:

    /sbin/ifconfig eth0 up
    /sbin/ifconfig wlan0 up

2. You could add a rule to your firewall using either UFW or iptables directly. UFW will block most incoming traffic by default.

3. If using Ethernet you could pull the cable, or if using an external WiFi dongle remove it.

The first is probably easier, but the second will allow you to allow/disallow traffic by IP address, port, protocol etc.

You don't mention what model Pi you are using, but a better long term solution may be to get a second Pi that you can dedicate to just the video, or a model 3B, which may provide better performance because of its upgraded processor - compared to other models.

There are a couple of options:

1. Take the interface down:

   /sbin/ifconfig eth0 down
   /sbin/ifconfig eth0 down
   

and to bring it back up:

    /sbin/ifconfig eth0 up
    /sbin/ifconfig wlan0 up

2. You could add a rule to your firewall using either UFW or iptables directly. UFW will block most incoming traffic by default.

The first is probably easier, but the second will allow you to allow/disallow traffic by IP address, port, protocol etc.

You don't mention what model Pi you are using, but a better long term solution may be to get a second Pi that you can dedicate to just the video.

There are a couple of options:

1. Take the interface down:

   /sbin/ifconfig eth0 down
   /sbin/ifconfig wlan0 down
   

and to bring it back up:

    /sbin/ifconfig eth0 up
    /sbin/ifconfig wlan0 up

2. You could add a rule to your firewall using either UFW or iptables directly. UFW will block most incoming traffic by default.

3. If using Ethernet you could pull the cable.

The first is probably easier, but the second will allow you to allow/disallow traffic by IP address, port, protocol etc.

You don't mention what model Pi you are using, but a better long term solution may be to get a second Pi that you can dedicate to just the video, or a model 3B, which may provide better performance because of its upgraded processor - compared to other models.