Can't access any external network resources

[ishankhare07]

Hi,
I'm following the source code and the thing i noticed was, I wasn't able to access and external network endpoints. All commands like ping, wget etc. failed from inside the child process.
Initially I thought this is because I haven't passed the CLONE_NEWNET namespace, but I don't think that should be the case. I tried adding it anyway but it didn't help.

[viniciusbds]

Hi @ishankhare07, did you solve the network problem?

I was facing this error too, I solved the problem by creating the /run/systemd/resolve/stub-resolv.conf file inside rootfs

as content of this file, I inserted "nameserver 8.8.8.8"

ps: i'm using the ubuntu as rootfs http://cloud-images.ubuntu.com/minimal/releases/focal/release/ubuntu-20.04-minimal-cloudimg-amd64-root.tar.xz

[ishankhare07]

@viniciusbds i'll give this a try. Is it because there's no DNS resolver?
I mean is that the only problem? Because if that's the case, I should be able to query a website by its IP without any issue.

[aahemm]

Hi @ishankhare07,
When you create a new network namespace you create a completely new networking stack that has nothing in it except one loopback interface that is DOWN. You need to do some amount of extra work to setup the network.