[Bug 1964093] Re: nfsver=3,udp not working anymore

[Andreas Hasenack]

Using focal as a server, jammy still cannot mount an export using udp,
but the other way around works: focal client can mount nfs share from
jammy using udp. So this seems a client problem.

** Changed in: nfs-utils (Ubuntu)
       Status: New => Won't Fix

** Changed in: nfs-utils (Ubuntu)
       Status: Won't Fix => Incomplete

** Changed in: nfs-utils (Ubuntu)
       Status: Incomplete => Confirmed

** Tags added: server-todo

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Title:
  nfsver=3,udp not working anymore

Status in nfs-utils package in Ubuntu:
  Confirmed

Bug description:
  Package: nfs-kernel-server
  Architecture: amd64
  Version: 1:2.6.1-1~exp1ubuntu1

  nfsversion 3 with proto udp seems not to be supported by the nfs-
  kernel-server anymore.

  In Ubuntu 18.04 (nfs-kernel-server 1:1.3.4-2.1ubuntu5) it was still
  possible. I could mount with either tcp or udp:

  1. tcp
  mount -o nfsvers=3 192.168.0.1:/srv/nfs/testshare /mnt

  mount|grep mnt:

  192.168.0.1:/srv/nfs/testshare on /mnt type nfs
  (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.0.1,mountvers=3,mountport=59808,mountproto=udp,local_lock=none,addr=192.168.0.1)

  
  2. udp
  mount -o nfsvers=3,udp 192.168.0.1:/srv/nfs/testshare /mnt

  mount|grep mnt:

  192.168.0.1:/srv/nfs/testshare on /mnt type nfs
  (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,proto=udp,timeo=11,retrans=3,sec=sys,mountaddr=192.168.0.1,mountvers=3,mountport=59808,mountproto=udp,local_lock=none,addr=192.168.0.1)

  
  Now in Ubuntu 22.04 I get the message:

  mount.nfs: an incorrect mount option was specified

  
  I tried to enable upd in /etc/nfs.conf in section [nfsd]:

  
  [nfsd]
  # debug=0
  # threads=8
  # host=
  # port=0
  # grace-time=90
  # lease-time=90
  # udp=n
  udp=y
  # tcp=y
  # vers2=n
  # vers3=y

  But there was no effect.

  nfs3 with udp is needed by several busybox mount binaries in initrds
  of Knoppix and other live distributions used via PXE boot.

  Best regards
  Jörg

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