google/dranet

Duplicate IPv6 routes found for interfaces using IPv6

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#274 aperta il 5 nov 2025

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Descrizione

Thanks to @liuyuan10 for spotting that there a scenario which is leading to presence of duplicate routes in the pod's namespace:

fd36::3:0:e:0:0/96 dev gpu0rdma2 proto kernel metric 256 pref medium
fd36::3:0:e:0:0/96 dev gpu0rdma2 metric 1024 pref medium

The behavior is only observed for interfaces with an IPv6 address that represents a subnet (rather than a complete /128). In this case, the kernel likely automatically creates a route for the IPv6 address that represents the subnet, e.g. the /96 above

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