

Thats great! Overly simplistic explanation, the container is in its own little network and when you connect wireguard inside the container it is punching a hole out to where the wireguard server is located. Without knowing your setup its difficult, but that is probably why your ping is acting as it does. The container doesn’t know how to get to where you’re attempting to ping.
The allowed ips is a list, off the top of my head it accepts single IPs and cidr blocks. 0.0.0.0/0 is the cidr block that essentially means all ipv4 IPs, ::/0 is the same for ipv6. So to answer directly, the ,
is an or, its for any IP in the list.
Couldn’t stand working with people who shop at Asda!