fix: Support multiple routes to the same IPv6 prefix through differen… - #3
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…t gateways learned from router advertisements
hmeerlo
approved these changes
Sep 14, 2026
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…t gateways learned from router advertisements
Summary
Allow NetworkManager to retain multiple IPv6 routes learned from Router Advertisements when they target the same prefix through different gateways.
Upstream
This backports NetworkManager merge request !1952, which is included in NetworkManager 1.50 (which is not available for bookworm).
Changes
nm_ndisc_add_route().1.42.4-1+athom3.Motivation
A Thread network can be reachable through multiple Thread Border Routers advertising the same prefix. NetworkManager previously considered these routes duplicates based on the prefix and on-link state, causing one gateway to replace the other. Including the gateway in the comparison preserves each route and makes the alternative gateways available to the Linux routing stack.