RE: replication time for dynamic records from primary to secondary servers
Cuttler, Brian R (HEALTH) via bind-users wrote: > > I don't think the issue I'm having is related to notify message not > being reacted to nor zone transfer requests not being sent to answered. It's worth checking the logs to make sure that they agree with what you expect. > What I think I'm seeing is DHCP updating the DNS primary, which works > correctly, but I don't believe it updates the SOA serial number nor > sends a notify message. The server is required (by RFC 2136 section 3.6) to update the serial number after an UPDATE. I would not expect any delay unless the server is in the middle of a lot of updates and has reached a notify or transfer rate limit - the logs should tell you if that has happened, or if there are any ACL-related problems. Tony. -- f.anthony.n.finchhttps://dotat.at/ Gibraltar Point to North Foreland: Northeasterly backing northwesterly 3 or 4, occasionally 5 at first, backing southwesterly 4 to 6 later. Slight or moderate, becoming mainly slight. Fair. Good. ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
RE: replication time for dynamic records from primary to secondary servers
Is there an entry in your server options similar to this? notify-delay nn; Regards, Bob ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
RE: replication time for dynamic records from primary to secondary servers
Tony, I don't think the issue I'm having is related to notify message not being reacted to nor zone transfer requests not being sent to answered. What I think I'm seeing is DHCP updating the DNS primary, which works correctly, but I don't believe it updates the SOA serial number nor sends a notify message. When you add a record to a zone, either by # nsupdate or via the transaction (I assume nsupdate protocol) between DHCP and DNS primary does something else need to be configured in order to get that incremental change sent to the secondary? Something that does not normally need to be set? The issue is not that frequently noticed. The typical problem that crossed by desk looks like this. - Someone put a new printer online, it gets an IP from DHCP and asks DHCP to register its "name" with DNS which DHCP does on behalf of our printers and desktop computers (we do not allow the end points to create DHCP records). - I don't believe this updates the SOA serial number nor generates a Notify message, thought at could be a deficiency in the config. - At some point the secondary gets all of the updated records from the primary but in that interval the print server is updated to create a new print queue and if it queries the DNS secondary the printer name may fail to resolve. The answers we have employed are 1) be patient 2) remove the deficient zones files from the DNS secondary and restart the DNS secondary. Should the incremental update from the DHCP server cause DNS to update the SN and send a notify message? Is there some other mechanism to update the secondary? Thanks, Brian -Original Message- From: Tony Finch On Behalf Of Tony Finch Sent: Wednesday, March 31, 2021 11:43 AM To: Cuttler, Brian R (HEALTH) Cc: bind-users@lists.isc.org Subject: Re: replication time for dynamic records from primary to secondary servers ATTENTION: This email came from an external source. Do not open attachments or click on links from unknown senders or unexpected emails. Cuttler, Brian R (HEALTH) via bind-users wrote: > > We are seeing a delay in the primary DNS server updating the secondary > and would like to shorten that interval. This is probably due to NOTIFY messages not working. NOTIFY is the mechanism that allows primary servers to tell secondaries to get the latest version of a zone promptly. I wrote some notes on debugging slow zone transfers a couple of weeks ago: https://protect2.fireeye.com/v1/url?k=9a160f3f-c58d367e-9a14f60a-000babda0106-d930663ddef913a2=1=067dcc81-1082-4e21-a672-c998f736beca=https%3A%2F%2Flists.isc.org%2Fpipermail%2Fbind-users%2F2021-March%2F104278.html Tony. -- f.anthony.n.finch https://protect2.fireeye.com/v1/url?k=4efddec9-1166e788-4eff27fc-000babda0106-90e4f91c3445cf30=1=067dcc81-1082-4e21-a672-c998f736beca=https%3A%2F%2Fdotat.at%2F Fair Isle: North 5 or 6, decreasing 3 or 4, then backing northwest 4 or 5 later. Moderate or rough, becoming slight or moderate. Mainly fair. Good. ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: replication time for dynamic records from primary to secondary servers
Cuttler, Brian R (HEALTH) via bind-users wrote: > > We are seeing a delay in the primary DNS server updating the secondary > and would like to shorten that interval. This is probably due to NOTIFY messages not working. NOTIFY is the mechanism that allows primary servers to tell secondaries to get the latest version of a zone promptly. I wrote some notes on debugging slow zone transfers a couple of weeks ago: https://lists.isc.org/pipermail/bind-users/2021-March/104278.html Tony. -- f.anthony.n.finchhttps://dotat.at/ Fair Isle: North 5 or 6, decreasing 3 or 4, then backing northwest 4 or 5 later. Moderate or rough, becoming slight or moderate. Mainly fair. Good. ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
RE: replication time for dynamic records from primary to secondary servers
Sorry, crisis (not named related) I will post sections of the named.conf later if needed, but will answer the simple questions now. I don't know what the propagation delay is, notifications are enabled, when the primary reloads a zone the secondary gets notified and requests a zone xfer. When the secondary expires a zone a zone xfer request is sent to the primary. I suspect that is happening is that when DHCPd creates/expires dynamic records in the primary we are not notifying the secondary of the change and there is no Ixfer. That it what I was looking for and don't know where to find it, but looks to me like the button I want to press. Is that where I should be looking? Thanks, Brian -Original Message- From: bind-users On Behalf Of John Thurston Sent: Tuesday, March 30, 2021 5:00 PM To: bind-users@lists.isc.org Subject: Re: replication time for dynamic records from primary to secondary servers ATTENTION: This email came from an external source. Do not open attachments or click on links from unknown senders or unexpected emails. On 3/30/2021 12:30 PM, Cuttler, Brian R (HEALTH) via bind-users wrote: > We are seeing a delay in the primary DNS server updating the secondary and > would like to shorten that interval. Can you post the pertinent bits of your primary's and secondary's config for the zone? In the absence of that, I pose a few questions: How long is it taking now? What is your target interval? Do you have NOTIFY enabled on the primary? How large is the zone? If you look in the log, do you see XFRs queuing? How many secondaries are there? Do you have limits defined on the number of simultaneous transfers? -- Do things because you should, not just because you can. John Thurston907-465-8591 john.thurs...@alaska.gov Department of Administration State of Alaska ___ Please visit https://protect2.fireeye.com/v1/url?k=cbf0c14f-946bf86b-cbf2387a-000babd9f8b3-62a89da1cb030f18=1=c3ff9561-4520-490e-967b-7c399b0453aa=https%3A%2F%2Flists.isc.org%2Fmailman%2Flistinfo%2Fbind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://protect2.fireeye.com/v1/url?k=fd8a10c2-a21129e6-fd88e9f7-000babd9f8b3-f9d2813b6b8c4a78=1=c3ff9561-4520-490e-967b-7c399b0453aa=https%3A%2F%2Fwww.isc.org%2Fcontact%2F for more information. bind-users mailing list bind-users@lists.isc.org https://protect2.fireeye.com/v1/url?k=5a41543e-05da6d1a-5a43ad0b-000babd9f8b3-9989cff63c934e23=1=c3ff9561-4520-490e-967b-7c399b0453aa=https%3A%2F%2Flists.isc.org%2Fmailman%2Flistinfo%2Fbind-users ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: replication time for dynamic records from primary to secondary servers
On 31/3/21, 8:00 am, "bind-users on behalf of John Thurston" wrote: On 3/30/2021 12:30 PM, Cuttler, Brian R (HEALTH) via bind-users wrote: > We are seeing a delay in the primary DNS server updating the secondary and would like to shorten that interval. Can you post the pertinent bits of your primary's and secondary's config for the zone? In the absence of that, I pose a few questions: How long is it taking now? What is your target interval? Do you have NOTIFY enabled on the primary? How large is the zone? If you look in the log, do you see XFRs queuing? How many secondaries are there? Do you have limits defined on the number of simultaneous transfers? Additional question, do you have "notify-delay" defined? Stuart ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: replication time for dynamic records from primary to secondary servers
On 3/30/2021 12:30 PM, Cuttler, Brian R (HEALTH) via bind-users wrote: We are seeing a delay in the primary DNS server updating the secondary and would like to shorten that interval. Can you post the pertinent bits of your primary's and secondary's config for the zone? In the absence of that, I pose a few questions: How long is it taking now? What is your target interval? Do you have NOTIFY enabled on the primary? How large is the zone? If you look in the log, do you see XFRs queuing? How many secondaries are there? Do you have limits defined on the number of simultaneous transfers? -- Do things because you should, not just because you can. John Thurston907-465-8591 john.thurs...@alaska.gov Department of Administration State of Alaska ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
replication time for dynamic records from primary to secondary servers
Zone replication question. I'm sure the answer is out there, but I'm not performing the right (google) query. My DDNS is working wonderfully, DHCP server updating primary DNS server. We are seeing a delay in the primary DNS server updating the secondary and would like to shorten that interval. If someone would help me find the right switch I'd love to update my config. Currently running bind 9.9.4 on Centos 7 (I see an Ubuntu platform in my future). Thanks in advance, Brian ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
