scavenging issue (fix addresses being scavenged)

[Guest bisi]

Hello,

we have our printers configured to do DHCP with fix reservations. DNS-

entries are being added manually for each printer since DNS security

is activated.

We activated scavenging a few weeks ago and now our printers start

disappearing in DNS, even if manually added adresses normaly should

not get affected by scavenging.

 

When I had a deeper look with dnscmd, I saw that most of the printers

have the timestamp set to 01.01.1601, so they should be ignored in

scavening. Others have an actual timestamp dating from a few days ago,

so they will be deleted in a few days or weeks when records get

"obsolete".

 

It seems to me that the time stamps get updated when printers are

rebooted, even if the entry was manally added, but i am not 100% sure

with that.

What can be the issue?

 

Best regards

CB

[Guest Herb Martin]

Re: scavenging issue (fix addresses being scavenged)

 

 

"bisi" <bisibis@pt.lu> wrote in message

news:33499a71-9011-4218-b05f-2e2e46de4853@d4g2000prg.googlegroups.com...

> Hello,

> we have our printers configured to do DHCP with fix reservations. DNS-

> entries are being added manually for each printer since DNS security

> is activated.

> We activated scavenging a few weeks ago and now our printers start

> disappearing in DNS, even if manually added adresses normaly should

> not get affected by scavenging.

>

> When I had a deeper look with dnscmd, I saw that most of the printers

> have the timestamp set to 01.01.1601, so they should be ignored in

> scavening. Others have an actual timestamp dating from a few days ago,

> so they will be deleted in a few days or weeks when records get

> "obsolete".

 

This should not be happening BUT this is NOT the first report we have

seen here (or elsewhere) indicating that MANUAL entries were being

scavenged.

 

It is my opinion that (in general) the "experts" on DNS don't see this

behavior and we have never known if this is due to different practices

OR to an unusual bug that they just don't encounter.

 

One suspicion is that the records is being create (by the Admin) with

the scavenge "when stale" option selected.

 

This supposition is unsatisfying (in general) because that option takes

some skill to FIND and those who can find it generally know better than

to use it for ordinary manual (or especially Reserved entries.)

> It seems to me that the time stamps get updated when printers are

> rebooted, even if the entry was manally added, but i am not 100% sure

> with that.

> What can be the issue?

 

Ensure that delete when stale is unchecked (you might need to go to

Advance VIEW in DNS Server console) and make sure you aren't

using any unusual methods of creating the record such that it gets

checked.

> Best regards

> CB

[Guest Yue Luo]

RE: scavenging issue (fix addresses being scavenged)

 

Could you check what permission has been set on the entries that are manually

created? If you tighten up the permission on these entries, will it help?

 

Yue

 

"bisi" wrote:

> Hello,

> we have our printers configured to do DHCP with fix reservations. DNS-

> entries are being added manually for each printer since DNS security

> is activated.

> We activated scavenging a few weeks ago and now our printers start

> disappearing in DNS, even if manually added adresses normaly should

> not get affected by scavenging.

>

> When I had a deeper look with dnscmd, I saw that most of the printers

> have the timestamp set to 01.01.1601, so they should be ignored in

> scavening. Others have an actual timestamp dating from a few days ago,

> so they will be deleted in a few days or weeks when records get

> "obsolete".

>

> It seems to me that the time stamps get updated when printers are

> rebooted, even if the entry was manally added, but i am not 100% sure

> with that.

> What can be the issue?

>

> Best regards

> CB

>