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k8snetworkplumbingwg / multus-cni

A CNI meta-plugin for multi-homed pods in Kubernetes
Apache License 2.0
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Multicast messages not receivable if sender and receiver pods are running on other AWS EKS nodes #1021

Closed Johannes1509 closed 1 year ago

Johannes1509 commented 1 year ago

Hello, I am trying to establish a multicast communication between pods of an AWS EKS cluster using Multus cni. I use the CLI tool "ssmping" (available for ubuntu) to check if a multicast connection is possible.

If I place the server and the client pod on one node, I can send and receive multicast and unicast messages successfully.

If I place the two pods on separate cluster nodes, then I can send/receive unicast messages but not multicast messages.

What could be the reason that a unicast but no multicast connection is possible?

nicklesimba commented 1 year ago

This looks like it may be an AWS EKS issue, and not a multus issue. Multus will only be responsible for creating the network interface, hence multus does not care about the network itself. In this case, multicast traffic is about network issues and AWS EKS manages the network. Please ask AWS EKS about that?

NeilJ12 commented 1 year ago

hello guy, please I want to know how do you succeed to do multicast on the same nodes with multus. For your issue maybe if you put a transit gateway it would work

github-actions[bot] commented 1 year ago

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 7 days.