DNS zone file wrongly overwritten wit DHCP update
 

Hi
I hope i have chosen the correct forum .

I' an using Centos 6.8 and i am testing DDns en it works file until i reboot the server . After the reboot i get following error :

Starting named:
Error in named configuration:
zone nw.cvotest.local/IN: loaded serial 37
zone 5.17.172.in-addr.arpa/IN: loaded serial 1
/var/named/reverse4.cvotest:3: ignoring out-of-zone data (.)
zone 4.17.172.in-addr.arpa/IN: has 0 SOA records
zone 4.17.172.in-addr.arpa/IN: has no NS records
zone 4.17.172.in-addr.arpa/IN: not loaded due to errors.
_default/4.17.172.in-addr.arpa/IN: bad zone
/var/named/reverse4.cvotest:3: ignoring out-of-zone data (.)
/var/named/reverse4.cvotest:14: ignoring out-of-zone data (100.4.17.172.in-addr.arpa)
/var/named/reverse4.cvotest:15: ignoring out-of-zone data (200.4.17.172.in-addr.arpa)
/var/named/reverse4.cvotest:17: ignoring out-of-zone data (50.4.17.172.in-addr.arpa)
/var/named/reverse4.cvotest:18: ignoring out-of-zone data (51.4.17.172.in-addr.arpa)
zone 6.17.172.in-addr.arpa/IN: has 0 SOA records
zone 6.17.172.in-addr.arpa/IN: has no NS records
zone 6.17.172.in-addr.arpa/IN: not loaded due to errors.
_default/6.17.172.in-addr.arpa/IN: bad zone

I found out that the reverse zone file is overwritten bij the DHCP update process

the original file was

$TTL 3H
@ IN SOA lserver.nw.cvotest.local. root.nw.cvotest.local (
1 ; serial
20 ; refresh
1800 ; retry
604800 ; expire
3H ) ; minimum
; Name Servers
@ IN NS lserver.nw.cvotest.local.
@ IN NS dmz.nw.cvotest.local.
@ IN NS Wserver.nw.cvotest.local.

;pointers
100 IN PTR dmz
200 IN PTR wserver


after the DDns update i get:

$ORIGIN .
$TTL 10800 ; 3 hours
@ IN SOA lserver.nw.cvotest.local root.nw.cvotest.local. (
7 ; serial
20 ; refresh (20 seconds)
1800 ; retry (30 minutes)
604800 ; expire (1 week)
10800 ; minimum (3 hours)
)
NS lserver.nw.cvotest.local.
NS dmz.nw.cvotest.local.
NS Wserver.nw.cvotest.local.
$ORIGIN 4.17.172.in-addr.arpa.
100 PTR dmz
200 PTR wserver
$TTL 300 ; 5 minutes
50 PTR dmzclient
51 PTR Wclient10.nw.cvotest.local.

I have 2 workstation's with get the correct ip adress 172.17.4.50 and 51(given by the DHCP server, this is the same server) and NSlookup and ping works fine until the reboot .
If i remove the first $ORIGIN everthin g is OK until the next update .

Thanks if anyone can give me a clue on how to get rid this .

Sorry for my english , this is not my native language.