Whilst installing and configuring shorewall (my go-to iptables firewall management tool on Ubuntu), each time I started it, it just stopped all external connectivity, despite having it "correctly configured".
After a few moments, I thought to just check that I did indeed have an eth0 and ran ifconfig - lo and behold, the cryptically name enp4s0 was my Ethernet interface.
/etc/network/interfaces also had an entry for this cryptic new device and lo - but nothing else.
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| Wait. What happened to eth0? |
