Rote LED

EEE ist ausgeschaltet (Disable)

cnc@debian:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 50:3e:aa:07:75:d0 brd ff:ff:ff:ff:ff:ff
inet 192.168.178.50/24 brd 192.168.178.255 scope global dynamic noprefixroute enp7s0
valid_lft 863976sec preferred_lft 863976sec
inet6 2003:d8:7748:d100:c2a3:9935:efd4:98be/64 scope global dynamic noprefixroute
valid_lft 7177sec preferred_lft 1353sec
inet6 fd73:2eef:88e8:0:5448:95f3:d261:cfb8/64 scope global dynamic noprefixroute
valid_lft 7177sec preferred_lft 3577sec
inet6 fe80::6726:6743:cea6:428e/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: enp8s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 24:4b:fe:cf:eb:d8 brd ff:ff:ff:ff:ff:ff
inet 10.10.10.5/8 brd 10.255.255.255 scope global noprefixroute enp8s0
valid_lft forever preferred_lft forever
inet6 fe80::3d43:4957:bbbf:6e2d/64 scope link noprefixroute
valid_lft forever preferred_lft forever

Might try disabling IPV6 and setting the netmask to /24 on the 10.10.10.5  interface.