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On my home wireless network, network-manager adds extra routes compared to wpa_supplicant, which causes IPv6 hosts on the local network to be unreachable. Route table is shown below, note that network-manager adds an extra route via fe80::...:44af for global IPv6 addresses on the local network (the 2a00:...::/64 block).

How do I configure network-manager to not add this additional route?

Any context as to what this route is and what it is for would also be appreciated. My router's web interface lists this as the "IPv6 LAN Link-Local Address" of the router (note there is also an IPv6 WAN Link Local Address", which is identical except it ends in 44ad).

Network Manager

$ ip -6 route show
::1 dev lo proto kernel metric 256 pref medium
2a00:...::/64 via fe80::...:44af dev wlp4s0 proto ra metric 600 pref medium
2a00:...::/64 dev wlp4s0 proto kernel metric 600 pref medium
fdaa:bbcc:ddee::/64 via fe80::...:44af dev wlp4s0 proto ra metric 600 pref medium
fdaa:bbcc:ddee::/64 dev wlp4s0 proto kernel metric 600 pref medium
fe80::/64 dev wlp4s0 proto kernel metric 600 pref medium
default via fe80::...:44af dev wlp4s0 proto ra metric 600 pref medium

wpa_supplicant

$ ip -6 route show
::1 dev lo proto kernel metric 256 pref medium
2a00:...::/64 dev wlp4s0 proto ra metric 302 mtu 1488 pref medium
fdaa:bbcc:ddee::/64 dev wlp4s0 proto ra metric 302 mtu 1488 pref medium
fe80::/64 dev wlp4s0 proto kernel metric 256 pref medium
default via fe80::...:44af dev wlp4s0 proto ra metric 302 mtu 1488 pref medium

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