Hi there,
Since 28 of July, 2020 at 10:15h, internet is unusable.
Outgoing connections have a high chance of being rejected by some polite network element in UPC network. Those connections are dropped with an ICMP admin-prohibited.
This is a dump on a usual session, trying to navigate (just the ICMP following TCP SYN packets):
$ sudo tcpdump -i eth0 -n -s0 icmp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
01:26:37.913907 IP 192.0.0.1 > 192.168.1.19: ICMP host X.Y.249.131 unreachable - admin prohibited filter, length 36
01:27:04.677682 IP 192.0.0.1 > 192.168.1.19: ICMP host X.Y.239.108 unreachable - admin prohibited filter, length 36
01:27:05.689324 IP 192.0.0.1 > 192.168.1.19: ICMP host X.Y.239.108 unreachable - admin prohibited filter, length 36
01:27:07.690564 IP 192.0.0.1 > 192.168.1.19: ICMP host X.Y.239.108 unreachable - admin prohibited filter, length 36
01:27:11.152762 IP 192.0.0.1 > 192.168.1.19: ICMP host X.Y.54.167 unreachable - admin prohibited filter, length 36
01:27:11.153076 IP 192.0.0.1 > 192.168.1.19: ICMP host X.Y.54.167 unreachable - admin prohibited filter, length 36
01:27:11.280868 IP 192.0.0.1 > 192.168.1.19: ICMP host X.Y.54.167 unreachable - admin prohibited filter, length 36
01:27:11.281348 IP 192.0.0.1 > 192.168.1.19: ICMP host X.Y.251.197 unreachable - admin prohibited filter, length 36
Please advice.