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# k3s

adamant-kite-43734

06/09/2025, 3:49 PM

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creamy-pencil-82913

06/09/2025, 4:21 PM

theres generally not any point in using routable address space for pod or service CIDRs. Traffic on these ranges is never meant to leave the cluster without being NATed or encapsulated.

creamy-pencil-82913

06/09/2025, 4:22 PM

If you’re doing a CNI that doesn’t encapsulate, and you are trying to enable direct routing between clusters or between clients and pods/services you might consider it, but doing so is generally considered a bad idea.

sticky-summer-13450

06/09/2025, 4:39 PM

Thanks Brad. I'm using the default Flannel CNI. I think that means you advise using ULA for both cluster-cidr and service-cidr and only using routable addresses for the LoadBalancer in Services, after adding

--flannel-ipv6-masq

. > generally not any point in using routable address space for pod or service CIDRs That sounds like excellent extra hints to enhance the paragraph on using ULA range addresses.

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