В общем, делал всё как обычно, только вот клиент не может достучаться до сервера.
root@ubntech:/mnt# mount --verbose -t nfs 192.168.1.245:/var/share /mnt/nfs/
mount.nfs: timeout set for Tue May 19 16:14:55 2015
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.245,clientaddr=192.168.1.232'
mount.nfs: mount(2): No such file or directory
mount.nfs: trying text-based options 'addr=192.168.1.245'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.245 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.245 prog 100005 vers 3 prot UDP port 53481
mount.nfs: mount(2): Stale file handle
mount.nfs: Connection timed out