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Allow to disable NFS client delegation on NFS server
When an NFSv4 client mounts a share from an NFS server and has nfso client_delegation set to 1, it causes the rtcmd daemon on NFS server to establish a callback connection to the n4bg daemon on the NFS client on a random high port.
These connections are not necessary for NFS functionality, and in the environments where not specifically allowed they cause numerous drops on the firewalls. This becomes a source of complaints coming from the network team.
As seen in the support case TS003909582, it does not seem to be possible to disable this callback on the NFS server. The only way to do so today is to disable it on the clients. This is cumbersome in certain environments where NFS clients and server are managed by different entities, and e.g. a "misconfigured" client can cause problem for NFS server administrator since it's the NFS server that is establishing the connection. It's much more efficient to just disable this type of connection on the server side.
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