Hi,
I'm posting this problem here while understanding it is about bind9.
But I also know that this is bind9 9.16.23, which is EOL.
Anyway, the problem is that for DHCP updates we sometimes see
twice a "deleting rrset" and one "adding an RR". This is not always
the case, but still quite often.
If the sequence is "deleting", "deleting", "adding" then no harm is done.
However, we also see "deleting", "adding", "deleting".
Here is the log of the harmless double delete. Notice that there are two
client IDs. I'm not
sure what they represent.
Aug 06 09:54:59 rotte.example.com named[1242897]: client @0x7f65fc87a1c8
172.16.19.254#38369/key dhcp_updater: updating zone 'example.com/IN':
deleting rrset at 'jukskei.example.com' A
Aug 06 09:54:59 rotte.example.com named[1242897]: client @0x7f65fc87a1c8
172.16.19.254#38369/key dhcp_updater: updating zone 'example.com/IN':
deleting rrset at 'jukskei.example.com' DHCID
Aug 06 09:55:00 rotte.example.com named[1242897]: client @0x7f6618020688
172.16.19.254#46659/key dhcp_updater: updating zone 'example.com/IN':
deleting rrset at 'jukskei.example.com' A
Aug 06 09:55:00 rotte.example.com named[1242897]: client @0x7f6618020688
172.16.19.254#46659/key dhcp_updater: updating zone 'example.com/IN':
deleting rrset at 'jukskei.example.com' DHCID
Aug 06 09:55:00 rotte.example.com named[1242897]: client @0x7f6618020688
172.16.19.254#46659/key dhcp_updater: updating zone 'example.com/IN':
adding an RR at 'jukskei.example.com' A 172.16.16.86
Aug 06 09:55:00 rotte.example.com named[1242897]: client @0x7f6618020688
172.16.19.254#46659/key dhcp_updater: updating zone 'example.com/IN':
adding an RR at 'jukskei.example.com' DHCID
AAEBdDhPkHrCf0585Se2a5NJW6WQU2zHuDEE/JncT0LEP5g=
Here is the log of a delete after a delete-add. After this one my
jira.example.com
DNS entry is gone. After next DHCP update it might be restored. Or not.
Aug 05 17:41:45 rotte.example.com named[1242897]: client @0x7f663c031798
172.16.19.254#57425/key dhcp_updater: updating zone 'example.com/IN':
deleting rrset at 'jira.example.com' A
Aug 05 17:41:45 rotte.example.com named[1242897]: client @0x7f663c031798
172.16.19.254#57425/key dhcp_updater: updating zone 'example.com/IN':
deleting rrset at 'jira.example.com' DHCID
Aug 05 17:41:45 rotte.example.com named[1242897]: client @0x7f663c031798
172.16.19.254#57425/key dhcp_updater: updating zone 'example.com/IN':
adding an RR at 'jira.example.com' A 172.16.16.112
Aug 05 17:41:45 rotte.example.com named[1242897]: client @0x7f663c031798
172.16.19.254#57425/key dhcp_updater: updating zone 'example.com/IN':
adding an RR at 'jira.example.com' DHCID
AAABkF+523ODxRn7oVLQDAVztA3mtAcHtIhWoMi/6FI/D6A=
Aug 05 17:41:46 rotte.example.com named[1242897]: client @0x7f662401e268
172.16.19.254#56832/key dhcp_updater: updating zone 'example.com/IN':
deleting rrset at 'jira.example.com' A
Aug 05 17:41:46 rotte.example.com named[1242897]: client @0x7f662401e268
172.16.19.254#56832/key dhcp_updater: updating zone 'example.com/IN':
deleting rrset at 'jira.example.com' DHCID
Does anyone recognize this? Does anyone have a clue?
BTW We have captured the network DDNS packets. They are all identical.
There is just a single delete and a single add in these packets.
--
Kees
--
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