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Full Discussion: Mountd problem in 5.3
Operating Systems AIX Mountd problem in 5.3 Post 302911835 by MariusM on Monday 4th of August 2014 01:47:46 AM
Old 08-04-2014
Mountd problem in 5.3

Dear all,

I'm troubleshooting some problem with NFS server, mountd to be precise. Server is running AIX 5.3. When NFS starts, mountd listens both on TCP and UDP ports:
Code:
rpcinfo -p | grep mountd
    100005    1   tcp   6666  mountd
    100005    2   tcp   6666  mountd
    100005    3   tcp   6666  mountd
    100005    1   udp   6666  mountd
    100005    2   udp   6666  mountd
    100005    3   udp   6666  mountd

Port 6666 is fixed in /etc/services. After the start server works fine, clients can mount exported directories without any issues. After some time (not sure how long, perhaps after some idle period) mountd stops listening on TCP and only UDP remains:
Code:
 rpcinfo -p | grep mountd
    100005    1   udp   6666  mountd
    100005    2   udp   6666  mountd
    100005    3   udp   6666  mountd

The problem is that clients still try to contact TCP port first, despite the fact (I can see that in network trace) that portmap says TCP program is not available. Such requests are retransmitted until they timeout and there is 2 min delay in service because of such retransmits. After timeout client tries UDP port and everything goes fine. Roughly speaking, network conversation goes like this:
Code:
Client: GETPORT Call MOUNT TCP
Server: GETPORT Reply PROGRAM_NOT_AVAILABLE
Client: GETPORT Call MOUNT UDP
Server: GETPORT Reply Port: 6666
<...some communication ongoing...>
Client: sends SYN to TCP port 6666
Client: resend SYN
Client: resend SYN
....
Timeout
Client: GETPORT Call MOUNT UDP
Server: GETPORT Reply Port: 6666
Client: MNT Call
...and everything goes ok...

Any ideas why mountd stops listening on TCP? Of course, there is another issue with clients who insist on TCP and ignores answers from portmap, but I thought I'll start with server side. In fact, I tried to read a bit about such client behaviour, too, but found nothing.
 

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MOUNTD(8)						    BSD System Manager's Manual 						 MOUNTD(8)

NAME
mountd -- service remote NFS mount requests SYNOPSIS
mountd [-dN] [-P policy] [-p port] [exportsfile] DESCRIPTION
mountd is the server for NFS mount requests from other client machines. mountd listens for service requests at the port indicated in the NFS server specification; see Network File System Protocol Specification, RFC 1094, Appendix A and NFS: Network File System Version 3 Protocol Specification, Appendix I. Options and operands available for mountd: -d Enable debugging mode. mountd will not detach from the controlling terminal and will print debugging messages to stderr. -N Do not require privileged ports for mount or NFS RPC calls. This option is equivalent to specifying ``-noresvport -noresvmnt'' on every export. See exports(5) for more information. Some operating systems (notably Mac OS X) require this option. -P policy IPsec policy string, as described in ipsec_set_policy(3). Multiple IPsec policy strings may be specified by using a semicolon as a separator. If conflicting policy strings are found in a single line, the last string will take effect. If an invalid IPsec policy string is used mountd logs an error message and terminates itself. -p port Force mountd to bind to the given port. If this option is not given, mountd may bind to every anonymous port (in the range 600-1023) which causes trouble when trying to use NFS through a firewall. exportsfile The exportsfile argument specifies an alternative location for the exports file. When mountd is started, it loads the export host addresses and options into the kernel using the nfssvc(2) system call. After changing the exports file, a hangup signal should be sent to the mountd daemon to get it to reload the export information. After sending the SIGHUP (kill -s HUP `cat /var/run/mountd.pid`), check the syslog output to see if mountd logged any parsing errors in the exports file. After receiving SIGTERM, mountd sends a broadcast request to remove the mount list from all the clients. This can take a long time, since the broadcast request waits for each client to respond. FILES
/etc/exports the list of exported filesystems /var/run/mountd.pid the pid of the currently running mountd /var/db/mountdtab the list of remotely mounted filesystems SEE ALSO
nfsstat(1), nfssvc(2), exports(5), nfsd(8), rpcbind(8), showmount(8) HISTORY
The mountd utility first appeared in 4.4BSD. BSD
November 2, 2011 BSD
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