<!-- Remove warning (above 3 lines) while reporting the issue -->

## Describe the bug
While trying to replicate the kubernetes cluster to setup 5g core, the upf is stuck on Container Creating for days.
```
free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx             0/1     ContainerCreating   0          20h
```
I have gpt5g module installed.

## To Reproduce
Steps to reproduce the behavior:
```
kubectl create ns free5gc
git clone https://github.com/Orange-OpenSource/towards5gs-helm.git
cd towards5gs-helm/charts/
helm -n free5gc install free5gc-v1 ./free5gc/
helm -n free5gc install ueransim-v1 ./ueransim/
watch kubectl get pods -n free5gc
```

## Expected behavior
A clear and concise description of what you expected to happen.
The upf pod to run properly.



## Environment (please complete the following information):
 - free5GC Version:  v3.0.1
 - OS:  Ubuntu 20.04
 - Kernel version: [e.g. 5.200.0-0-generic]
 - go version:  1.18.0 linux/amd64






### Log File
`kubectl describe pods -n free5gc` gives the following for upf
```
Events:
  Type     Reason                  Age                    From               Message
  ----     ------                  ----                   ----               -------
  Normal   Scheduled               12m                    default-scheduler  Successfully assigned free5gc/free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx to minikube
  Normal   AddedInterface          11m                    multus             Add eth0 [10.244.120.97/32] from k8s-pod-network
  Normal   AddedInterface          11m                    multus             Add n3 [10.100.50.233/29] from free5gc/n3network-free5gc-v1-free5gc-upf
  Warning  FailedCreatePodSandBox  11m                    kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "9ae74f3a589ba771246a3c5bde9c1a7d3e3ee230f31dcc7eef02d4fbecfbac95" network for pod "free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx": networkPlugin cni failed to set up pod "free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx_free5gc" network: plugin type="multus" name="multus-cni-network" failed (add): [free5gc/free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx/:n6network-free5gc-v1-free5gc-upf]: error adding container to network "n6network-free5gc-v1-free5gc-upf": plugin type="ipvlan" failed (add): failed to lookup master "eth1": Link not found
  Normal   AddedInterface          11m                    multus             Add eth0 [10.244.120.89/32] from k8s-pod-network
  Normal   AddedInterface          11m                    multus             Add n3 [10.100.50.233/29] from free5gc/n3network-free5gc-v1-free5gc-upf
```
Why is eth1 not found?
[Bug] UPF not working in Kubernetes Cluster
This is a GitHub Issue
repo:free5gc
owner:free5gc
Title : [Bug] UPF not working in Kubernetes Cluster
Issue date:

--- start body ---
<!-- Remove warning (above 3 lines) while reporting the issue -->

## Describe the bug
While trying to replicate the kubernetes cluster to setup 5g core, the upf is stuck on Container Creating for days.
```
free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx             0/1     ContainerCreating   0          20h
```
I have gpt5g module installed.

## To Reproduce
Steps to reproduce the behavior:
```
kubectl create ns free5gc
git clone https://github.com/Orange-OpenSource/towards5gs-helm.git
cd towards5gs-helm/charts/
helm -n free5gc install free5gc-v1 ./free5gc/
helm -n free5gc install ueransim-v1 ./ueransim/
watch kubectl get pods -n free5gc
```

## Expected behavior
A clear and concise description of what you expected to happen.
The upf pod to run properly.



## Environment (please complete the following information):
 - free5GC Version:  v3.0.1
 - OS:  Ubuntu 20.04
 - Kernel version: [e.g. 5.200.0-0-generic]
 - go version:  1.18.0 linux/amd64






### Log File
`kubectl describe pods -n free5gc` gives the following for upf
```
Events:
  Type     Reason                  Age                    From               Message
  ----     ------                  ----                   ----               -------
  Normal   Scheduled               12m                    default-scheduler  Successfully assigned free5gc/free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx to minikube
  Normal   AddedInterface          11m                    multus             Add eth0 [10.244.120.97/32] from k8s-pod-network
  Normal   AddedInterface          11m                    multus             Add n3 [10.100.50.233/29] from free5gc/n3network-free5gc-v1-free5gc-upf
  Warning  FailedCreatePodSandBox  11m                    kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "9ae74f3a589ba771246a3c5bde9c1a7d3e3ee230f31dcc7eef02d4fbecfbac95" network for pod "free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx": networkPlugin cni failed to set up pod "free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx_free5gc" network: plugin type="multus" name="multus-cni-network" failed (add): [free5gc/free5gc-v1-free5gc-upf-upf-848cc8fb48-gzhgx/:n6network-free5gc-v1-free5gc-upf]: error adding container to network "n6network-free5gc-v1-free5gc-upf": plugin type="ipvlan" failed (add): failed to lookup master "eth1": Link not found
  Normal   AddedInterface          11m                    multus             Add eth0 [10.244.120.89/32] from k8s-pod-network
  Normal   AddedInterface          11m                    multus             Add n3 [10.100.50.233/29] from free5gc/n3network-free5gc-v1-free5gc-upf
```
Why is eth1 not found?
--- end body ---
