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Aaron T. Myers commented on HDFS-6439: -------------------------------------- bq. Are you referring "nfs.port.monitoring.enabled"? It's pretty new and I don't think it's in any release yet. Yep, that's the one I meant. I'd put it in regardless - can't cause any harm. > NFS should not reject NFS requests to the NULL procedure whether port > monitoring is enabled or not > -------------------------------------------------------------------------------------------------- > > Key: HDFS-6439 > URL: https://issues.apache.org/jira/browse/HDFS-6439 > Project: Hadoop HDFS > Issue Type: Bug > Components: nfs > Affects Versions: 2.4.0 > Reporter: Brandon Li > Assignee: Aaron T. Myers > Attachments: HDFS-6439.003.patch, HDFS-6439.004.patch, > HDFS-6439.patch, HDFS-6439.patch, > linux-nfs-disallow-request-from-nonsecure-port.pcapng, > mount-nfs-requests.pcapng > > > As discussed in HDFS-6406, this JIRA is to track the follow update: > 1. Port monitoring is the feature name with traditional NFS server and we may > want to make the config property (along with related variable > allowInsecurePorts) something as dfs.nfs.port.monitoring. > 2 . According to RFC2623 (http://www.rfc-editor.org/rfc/rfc2623.txt): > {quote} Whether port monitoring is enabled or not, NFS servers SHOULD NOT > reject NFS requests to the NULL procedure (procedure number 0). See > subsection 2.3.1, "NULL procedure" for a complete explanation. {quote} > I do notice that NFS clients (most time) send mount NULL and nfs NULL from > non-privileged port. If we deny NULL call in mountd or nfs server, the client > can't mount the export even as user root. > 3. it would be nice to have the user guide updated for the port monitoring > feature. -- This message was sent by Atlassian JIRA (v6.2#6252)