I use a VPN (Ubuntu 20.04, OpenFortiGui) to connect to the institute's server. I have no issues when using WiFi. Since the WiFI is pretty slow, I bought a USB-Ethernet adapter and cloned the MAC address of the institute's laptop to use on my personal laptop. I can connect to the Internet and ping google.com. The problem is that when using the Ethernet connection I cannot connect to the VPN and I cannot ping the server (which I can when using WiFi, even with the VPN off).
The output of route is the following:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 172.20.20.1 0.0.0.0 UG 100 0 0 enx7cc2c61f63f3
link-local 0.0.0.0 255.255.0.0 U 1000 0 0 enx7cc2c61f63f3
172.20.20.0 0.0.0.0 255.255.254.0 U 100 0 0 enx7cc2c61f63f3
The output of ifconfig -a is the following:
enx7cc2c61f63f3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.20.190 netmask 255.255.254.0 broadcast 172.20.21.255
inet6 fe80::c713:85cd:adc7:2566 prefixlen 64 scopeid 0x20<link>
ether ec:21:e5:8a:6a:1c txqueuelen 1000 (Ethernet)
RX packets 256301 bytes 40204839 (40.2 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13789 bytes 2510287 (2.5 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 327330 bytes 99420732 (99.4 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 327330 bytes 99420732 (99.4 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp52s0: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether 8c:c6:81:d2:44:7f txqueuelen 1000 (Ethernet)
RX packets 3596453 bytes 4423311204 (4.4 GB)
RX errors 0 dropped 6210 overruns 0 frame 0
TX packets 1351475 bytes 285954939 (285.9 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
