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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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: server-todo
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nfsver=3,udp not working anymore
https://bugs.launchpad.net/bugs/1964093
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