On Friday, March 13, 2026 2:43:15 PM Eastern Daylight Time Martin Gerhard Loschwitz via ceph-users wrote:

Folks,

I have a setup here where a server has a single /32 IP from 10.1.0.0/16. It has a perfectly normal IP address and is reachable from within the local network thanks to EVPN. cephadm however only detects nonsense:

{ "fe80::/64": { "data1": [ "fe80::425b:7fff:fec8:c956" ], "loopback0": [ "fe80::1c54:fbff:fe6a:51e7" ] } }

How can I set the networks the machine has manually so that it becomes usable for MON placement? At this time, ceph-mgr does not deploy additional MONs, for instance, because it claims that the host network does not match the public network, while I assume the host network is directly read from the „cephadm list-networks“ output.

Thank you very much in advance

Could you share the outputs of: * ip link show * ip addr show * ip route show and * cephadm list-networks (or confirm that the snippet you shared above is the complete output of the command) Thanks!