Closed avrodriguezgrad closed 8 months ago
Hi @avrodriguezgrad,
Thank you for the kind words! Thank you for the great work on the Gradiant project as well! I think you are hitting an issue similar to this one https://people.kernel.org/dsahern/management-vrf-and-dns
Does it work if you set as nameserver 1.1.1.1 in /etc/resolv.conf?
Thanks and cheers, Valentin
Yes, it works! The problem is what the article says about isolation of vrf. resolv.conf was configured with 127.0.0.53, so vrf interface does not reach DNS servers. If I set a different nameserver, it works.
Now, I have to figure out how to config this automatically, but I assume that this will not be a problem when implementing eBPF.
Thanks, Álvaro
The big issue, is that in Linux, you cannot set a nameserver per VRF. So you'll have an issue either with your UE if you choose a nameserver reachable only by your host (systemd-resolved 127.0.0.53), or with your host if you choose a nameserver reachable only by your UE / through the GTP-U tunnel.
This won't be an issue if you run PacketRusher inside a container however, as the /etc/resolv.conf will affect only the container's domain resolution.
Cheers, Valentin
Hi @linouxis9
I am starting to use PacketRusher, and I believe it's incredible. Thank you for this tool!
I have a doubt regarding DNS configuration. Do you know if it's possible to config 5GC dns servers in VRF? I'm using Open5GS, and connectivity through IP works well, but when I try to ping a name (google.es e.g.), it is not working.
Thanks in advance, Álvaro