Am 25.04.25 um 09:09 schrieb Benoit Panizzon:
Package: network-manager Version: 1.42.4-1 Severity: normal File: /usr/sbin/NetworkManagerDear Maintainer, I have been fighting with wrong ipv6 routes for quite a while and have finally been able to track them to NetworkManager being the cause. But not what exactly in NetworkManager causes the issue. I have a system with two ethernet interfaces. One is actually a vxlan interface used as a L2 VPN and is set up by some of my scripting. In this example, assume eth0 and vxlan1 I have little control of the ipv6 RA being sent to both interfaces. But for the L2 VPN to work as intended, I need the IPv6 default route to point to that interface. So prior to set up the vxlan interface I disable accept_ra on eth0 and delete the existing default route: ip link add vxlan1 type vxlan id 1 dstport 4789 remote 192.168.10.2 sysctl -w net.ipv6.conf.eth0.accept_ra_defrtr=0 sysctl -w net.ipv6.conf.eth0.accept_ra=0
If you are going to manage eth0 manually, why do you want NetworkManager to manage eth0 as well?
You can mark a device as unmanaged by NetworkManager https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/configuring-networkmanager-to-ignore-certain-devices_configuring-and-managing-networking#permanently-configuring-a-device-as-unmanaged-in-networkmanager_configuring-networkmanager-to-ignore-certain-devicesAside from that, if you want to have NM manage eth0, you can use the ipv6 specific settings
https://www.networkmanager.dev/docs/api/latest/nm-settings-nmcli.html See ipv6.method and related settings.
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