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--- linux:networking [2026/03/06 12:49] – created v1ctor
+++ linux:networking [2026/03/27 20:34] (current) – [TCP OFFLOADING] v1ctor
@@ Line 13: / Line 13: @@
 $ scp username@remotehost:file_name.txt /local/directory     # from remote to local
 $ scp file_name.txt username@remotehost:/remote/directory    # from local to remote
-$ scp -r dir_name username@remotehost:/remote/directory      # copy the local directory "dir_name" to remote host
+$ scp -r dir_name username@remotehost:/remote/directory      # copy the local directory "dir_name" to
+                                                             # remote host
 $ scp -6 username@\[2001:db8:0:1\]:/home/username/test.file ./test.file # going via ipv6
 </code>
@@ Line 28: / Line 29: @@
 Basic TCP test:
 <code bash>
-nc -vz 10.10.0.1 80     # v - verbose; z - just scan for listening daemon, without sending any data to them
+nc -vz 10.10.0.1 80     # v - verbose; z - just scan for listening daemon,
+                        # without sending any data to them
 </code>
@@ Line 101: / Line 103: @@
 <code bash>
 $ sudo ethtool -K ens3 tso off
+</code>
+==== CONNECTIONS ====
+Pinpoint the service that's using a port:
+<code bash>
+$ lsof -i # "-i" option selects the listing of all network files
+$ lsof -i:22 # filter out only port 22
+$ sudo ls -la /proc/58198/exe
+lrwxrwxrwx 1 user user 0 Aug 17 11:48 /proc/58198/exe -> /opt/python/3.6/bin/python3.6
 </code>