We have a Linux NFS server (using ZFS) which supports NFS4. It uses fixed ports for everything and those ports are allowed through the firewall. We have a number of Linux clients which use this and other NFS servers, they have a DROP ALL for all all packets arriving on non-whitelisted ports. I think that file delegations might not be working due to callbacks not succeeding because the client port specified in SETCLIENTID by the client is blocked by the firewall. I have a couple of questions: How do I check whether file delegations are working properly? Munin graphs indicate 0 calls for some of the names which sound like they are to do with delegations such as delagreturn or delagpurge but is there some way of checking conclusively? How do I specify what client port to provide in SETCLIENTID, there should be some mount option? I can't find it. Or if it is a well defined number, what is it? Any pointers to answers? Thank you, Daniel
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