Hi,

I'm using podman 2.2.1 rootless with slirp4netns and IPv6 enabled
(--network slirp4netns:enable_ipv6=true). Straight after starting my
container the code inside tries to connect to a server using IPv6 but
fails due to the network being unreachable. However if I add a small
delay before trying to connect it works. If I use IPv4 this seems to
work right after the container is started, which of course still takes a
few ms until the code is started.

I can actually easily recreate the using podman 3.1.2 as well.

this works:
podman run -it --network slirp4netns:enable_ipv6=true --entrypoint bash
fedora:34 -c "curl -v -4 https://www.google.com"

this fails:
podman run -it --network slirp4netns:enable_ipv6=true --entrypoint bash
fedora:34 -c "curl -v -6 https://www.google.com"

but works with a delay:
podman run -it --network slirp4netns:enable_ipv6=true --entrypoint bash
fedora:34 -c "sleep 2; curl -v -6 https://www.google.com"

Is the network setup done after the container is already started and
thus this needs to be expected?

thanks,
Hendrik
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