Add "auto" option to ipv4-subnet and ipv6-subnet #1962
Merged
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If we do not care about the assigned IPv4/IPv6 subnet for the container network, we let the container runtime allocate one for us. This guarantees to avoid a collision of the hardcoded range (172.20.20.0/24 and 2001:172:20:20::/64) with any existing container networks. For example this makes it possible to run concurrent isolated topologies without directly modifying the topology files.
This just works for the podman runtime. For the docker runtime we compute the IPv6 subnet manually because it can only pick addresses from the configured (global) subnet.