MTU size

[haribhusal2025]

What would you like to be added?

Spiderpool should allow user to define a custom mtu like how it does allow to define/select 'master interface' and other setting. Below is an example of how multus allows defining mtu size for this additional interface.

cat <<EOF | kubectl create -f -
apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: macvlan-conf-1
spec:
  config: '{
            "cniVersion": "0.3.0",
            "type": "macvlan",
            "master": "eth1",
            "mode": "bridge",
            "mtu": "1480",
            "ipam": {
                "type": "host-local",
                "ranges": [
                    [ {
                         "subnet": "10.10.0.0/16",
                         "rangeStart": "10.10.1.20",
                         "rangeEnd": "10.10.3.50",
                         "gateway": "10.10.0.254"
                    } ]
                ]
            }
        }'
EOF

Why is this needed?

Our use case is, by default interfaces on cluster nodes are set at 9000 but some applications/destination require smaller mtu size for it to be successful due to legacy system/equipments etc. We have been able to solve it by defining mtu size in cilium cni on per node basis but having it managed by spiderpool/multus would be great as we wont have to change settings in cilium and we could have as many additional interfaces we need.

How to implement it (if possible)?

multus configuration should give some idea.

Additional context

No response

[cyclinder]

Hi @haribhusal2025, thanks for your contribution. We are considering implementing this this month. also please let me know if you are interested in this. you can follow this: 4ed834b#diff-fa1085a973033fc72b29474a726eea75e7937cd7a341fd01bd8f406077262e3b