https://community.hpe.com/t5/operating-system-linux/secondary-dns-updates/m-p/5108245#M49699 When you changed the primary DNS zone data file, did you increment the serial number of the zone?<BR /><BR />The secondary server will check the serial number of the zone to find out whether the zone information has changed or not.<BR /><BR />The serial number is located in the SOA record of the zone. A common practice is to set the number as YYYYMMDDVV to document the date of the last change. The last two digits (VV) are a version number, so you can make 100 separate changes in one day, if necessary.<BR /><BR />However, the DNS servers interpret the serial number as just one big number, so the use of YYYYMMDDVV format is not mandatory. Just incrementing the serial number by 1 is enough to signal the secondary servers that some changes have been made.<BR /><BR />MK Sun, 11 May 2008 11:58:42 GMT Matti_Kurkela 2008-05-11T11:58:42Z https://community.hpe.com/t5/operating-system-linux/secondary-dns-updates/m-p/5108244#M49698 Hello,<BR />I have done a change in primary DNS server, and the change was successfull. When I chaeck the secondary dns server, even I have done the same updates, but still the old IP address is resoleved instead of the new one!!!<BR />Thanks. Sun, 11 May 2008 08:39:51 GMT https://community.hpe.com/t5/operating-system-linux/secondary-dns-updates/m-p/5108244#M49698 Fuad_1 2008-05-11T08:39:51Z https://community.hpe.com/t5/operating-system-linux/secondary-dns-updates/m-p/5108245#M49699 When you changed the primary DNS zone data file, did you increment the serial number of the zone?<BR /><BR />The secondary server will check the serial number of the zone to find out whether the zone information has changed or not.<BR /><BR />The serial number is located in the SOA record of the zone. A common practice is to set the number as YYYYMMDDVV to document the date of the last change. The last two digits (VV) are a version number, so you can make 100 separate changes in one day, if necessary.<BR /><BR />However, the DNS servers interpret the serial number as just one big number, so the use of YYYYMMDDVV format is not mandatory. Just incrementing the serial number by 1 is enough to signal the secondary servers that some changes have been made.<BR /><BR />MK Sun, 11 May 2008 11:58:42 GMT https://community.hpe.com/t5/operating-system-linux/secondary-dns-updates/m-p/5108245#M49699 Matti_Kurkela 2008-05-11T11:58:42Z https://community.hpe.com/t5/operating-system-linux/secondary-dns-updates/m-p/5108246#M49700 Thanks it works. Mon, 12 May 2008 04:50:26 GMT https://community.hpe.com/t5/operating-system-linux/secondary-dns-updates/m-p/5108246#M49700 Fuad_1 2008-05-12T04:50:26Z