I have an openwrt device with 4g module, the device has a public IP on it.
For some reason, people keep sucking the bandwidth out of my thin 4g connection.
How can I protect my device against these people, who the hell is the sky.com and why it keeps scanning me?
Did you open UDP 161 (SNMP) on your WAN interface?
By default all external ports should be blocked by the firewall.
You hardly can avoid people sending your a request package but you can avoid sending an answer.
@Expeto - How are you generating the list of connections?
Status -> Realtime Graphs -> Connections
Have you got a Sky tv box in the house?