Thanks for your promptness, but DNS is ok and I have no firewall.
[root@w530 ~]# dig w530.jakobi.fr

; <<>> DiG 9.10.3-P2-RedHat-9.10.3-7.P2.fc22 <<>> w530.jakobi.fr
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61631
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;w530.jakobi.fr.            IN    A

;; ANSWER SECTION:
w530.jakobi.fr.        38400    IN    A    192.168.1.14

;; AUTHORITY SECTION:
jakobi.fr.        38400    IN    NS    raspb.jakobi.fr.

;; ADDITIONAL SECTION:
raspb.jakobi.fr.    38400    IN    A    192.168.1.2

;; Query time: 3 msec
;; SERVER: 192.168.1.2#53(192.168.1.2)
;; WHEN: mer. janv. 27 21:22:44 CET 2016
;; MSG SIZE  rcvd: 95

[root@w530 ~]# host 192.168.1.14
14.1.168.192.in-addr.arpa domain name pointer w530.jakobi.fr.
[root@w530 ~]#  firewall-cmd --list-all
FirewallD is not running
[root@w530 ~]#