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I noticed abnormal network activity when trying to test something and I can't find what program is the culprit.

Wireshark: wireshark log

My local IP is 192.168.100.5

I tried to inspect with sudo netstat -latpen and sudo lsof -i but there's no trace of it. Only on sudo iftop -pPl and sudo pktstat -i enp7s0 -nt works but it's not revealing what process is sending pings.

iftop:

iftop log

This can be seen using sudo tcpdump ip proto \\icmp command but that's all, I can't see this on any other tool. And I inspected all programs that could use it. I have UFW enabled and blocking port 7759 (IPv4/IPv6) but it doesn't work.

How could I locate the program that sends all these pings?

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  • See also curl http://node-241.cheese-onion.nl which may give a hint, possibly?
    – Kusalananda
    Sep 10, 2022 at 8:27
  • Looks like it's a protocol associated with Tribler which is a torrent and onion routing related tool. I wouldn't be surprised that this protocol triggers connections from unknown peers just like any torrent download would. OP could give more feedback about its use. To check which tool: as root (ie: on Ubuntu use sudo): ss -aunp sport == 7759 (your netstat checked TCP while it's UDP).
    – A.B
    Sep 10, 2022 at 8:52
  • @A.B I guess you're right, I have Tribler installed. The strange thing is that it's not running at all! I installed it as Flatpak without background permission and somehow still this is running (but also there's no Tribler process or something related to it). There's a way to stop this? Sep 11, 2022 at 1:04

1 Answer 1

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Try using iptables instead of ufw. UFW works at the software level, where IPTables works at the kernel level:

Run these commands in a terminal:

/sbin/iptables -A INPUT -p tcp -m multiport --dports 7759,7760 -j DROP
/sbin/iptables -A INPUT -p tcp -m multiport --sports 7759,7760 -j DROP

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