DNS server reboot
Due to a kernel update, the server needs to be rebooted. Thanks to the Anycast used here, the service can be used without interruption as specified at https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/2ba452a647764d9aa91c80a5d18f7772/.
reboot des DNS64-Servers
Due to a kernel update, the server that operates DNS64, among other things, must be restarted.
Zertifikatstausch für DoT und DoH
The certificate used by the RWTH DNS servers [0] for DoT and DoH must be replaced. No interruption to the service is expected.
[0]
https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/2ba452a647764d9aa91c80a5d18f7772/
Uplink to Frankfurt down
The main network connection to Frankfurt is currently down. All data traffic is now running via the line to Hanover.
Reboot der DNS-Server wg. Kernel Update
Wegen eines Kernel-Updates ist ein reboot der Server nötig. Durch den hier verwendeten Anycast ist der Dienst wie auf https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/2ba452a647764d9aa91c80a5d18f7772/ angegeben ohne Unterbrechung nutzbar.
DNS64
Der DNS64-Dienst, welcher derzeit für den Test-Betrieb des NAT64 verwendet wird ist aktuell gestört
DNS RPZ
Some records have been added to the local RWTH response policy zone with "passthru" policy - so just logging but not blocking DNS requestst to known bad domains.
Routing über neue XWiN-Router
During this period, the routing of the previous XWiN routers (Nexus 7700) will be switched to the new XWiN routers (Catalyst 9600). These routers are essential for RWTH's network connection. This changeover also requires the migration of the DFN connection, which is switched redundantly to Frankfurt and Hannover, and the RWTH firewall to the new systems.
There will be complete or partial outages of the external connection during the maintenance window. All RWTH services (e.g. VPN, email, RWTHonline, RWTHmoodle) will not be available during this period. The accessibility of services within the RWTH network will be temporarily unavailable due to limited DNS functionality.
Update der Server
The operating system including the software used undergoes an update during which it must be restarted. However, this should not result in a loss of service.
Verzögerte Antwortzeiten
For the second time today we see a delayed response behavior at the central DNS of the RWTH, but the service itself is not affected.
Update der Server
The operating system including the software used undergoes an update during which it must be restarted. However, this should not result in a loss of service.
CAA issuemail record (RFC 9495)
The CAA issuemail record described in RFC 9495 has been implemented in the DNS-Admin. This regulates which CA may issue S/MIME (aka user) certificates.
As with server certificates (issue), we set the CA from the Trusted Certificate Service from GÉANT as the default here (issuemail), but administrators can authorize other CAs individually using their own entries in the DNS.
Update der Server
The operating system including the software used undergoes an update during which it must be restarted. However, this should not result in a loss of service.
Anpassung der Policy für die DNS-Firewall (aka Response-Policy-Zone, kurz RPZ)
After the successful tests with the DNS test system, we want to change the policy of the DNS firewall on the prod. server (https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/89438b835bbb4c9fab1249e0b9a5c439/) from “passthru” to “nxdomain”. This is intended to prevent the establishment of connections to websites/computers with malware in addition to the mechanisms of the RWTH firewall. Despite the explicit allow lists provided by DFN and SWTICH, it is possible that certain/desired/legitimate domains (websites) have been blocked. After an individual check, these can be allowed via an RWTH's own list. In the event of such a block, please send an e-mail to hostmaster@rwth-aachen.de. Conversely, we will contact students/administrators of the institution if we see anomalies in our explicit RPN logs.
Reboot des DNS64-Servers
A server that provides the DNS64 test position must be restarted.
Policy-Anpassung DNS-Firewall (aka Response-Policy-Zone, kurz RPZ) auf dem Test-Server
On the DNS test server, we will set the policy from the current “passthru” to a more restrictive mode in order to explore how we want to implement this on the official DNS servers of the RWTH. Customers who also use the DNS64 test operation running there, relevant for NAT64 PoC, are affected by the adjustment.
DNS-Firewall (aka Response-Policy-Zone, kurz RPZ)
We can use their so-called DNS firewall/DNS RPZ via DFN-Cert. In the long term, we want to use these response policy zones to prevent and log queries to our DNS servers for domains that are demonstrably malicious. For the time being, however, we are starting with a so-called “passthru”. With this policy, queries are answered as usual, the more restrictive policy (e.g. response with “nxdomain”) will be activated at another time.
Diverse Ausfälle des Uplinks nach Frankfurt
Aufgrund von Linkflaps der Anbindung nach Frankfurt kommt es derzeit zu kurzen Unterbrechungen der Konnektivität. Es wird bereits an einer Lösung des Problems gearbeitet.
Inbetriebnahme neuer Hardware - Teil 04
After the relocation of the so-called caching name servers (documented on [0]), the zone servers must also be migrated to the new hardware. On this date, one (of two at RWTH) zone servers will be moved.
Anyone who has registered the servers mentioned on [0] will not be affected by this adjustment. Those who use other name servers (e.g. those of Google) may have a problem in individual cases in the event of an error. With the two zone servers operated by the DFN in total four servers are relevant here (chosen at random), any errors should only occur sporadically.
[0]
https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/89438b835bbb4c9fab1249e0b9a5c439/
Inbetriebnahme neuer Hardware - Teil 03
After the relocation of the so-called caching name servers (documented on [0]), the zone servers must also be migrated to the new hardware. On this date, one (of two at RWTH) zone servers will be moved.
Anyone who has registered the servers mentioned on [0] will not be affected by this adjustment. Those who use other name servers (e.g. those of Google) may have a problem in individual cases in the event of an error. With the two zone servers operated by the DFN in total four servers are relevant here (chosen at random), any errors should only occur sporadically.
[0]
https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/89438b835bbb4c9fab1249e0b9a5c439/
Inbetriebnahme neuer Hardware - Teil 02
Der DNS-Dienst zieht auf neue Hardware um. An den nutzbaren IPv4 und IPv6 Adressen (https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/89438b835bbb4c9fab1249e0b9a5c439/) ändert sich nichts.
Aufgrund der redundanten Aufstellung (AnyCast) und sequentieller Inbetriebnahme ist keine Unterbrechung geplant.
Der Fehler, welcher für die Unterbrechung am 17.12.2024 gesorgt hat, wurde behoben.
Inbetriebnahme neuer Hardware - Teil 01
The DNS service is moving to new hardware. The usable IPv4 and IPv6 addresses (https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/89438b835bbb4c9fab1249e0b9a5c439/) will not change. Due to the redundant setup (AnyCast) and sequential commissioning, there should be no interruption.
Migration Datenbankservice Abteilung Netze
wegen der Migration unseres Datenbankservers werden im Wartungszeitraum Applikationen auf TK-Portal, RA-Portal und NOC-Portal, sowie der Zugang zum WLAN RWTH-guests mit Gastkennung nicht zur Verfügung stehen.
Austausch von Hard- und Software - Teil 01
The (anycast) infrastructure [0] is undergoing a hardware and software upgrade. The plan here is to successively integrate the new components into the existing infrastructure so that it can ultimately be freed from the elements to be replaced.
[0]
https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/89438b835bbb4c9fab1249e0b9a5c439/
Unter bestimmten Voraussetzung Namensauflösung niocht möglich
Currently some domains/zones hosted by us are not resolving correctly.
We are working on fixing this.
Hosts of RWTH Aachen University partly not accessible from networks of other providers
Due to DNS disruption, the name servers of various providers are currently not returning an IP address for hosts under *.rwth-aachen.de.
As a workaround, you can store alternative DNS servers in your connection settings, e.g. the Level3-Nameserver (4.2.2.2 and 4.2.2.1) or Comodo (8.26.56.26 und 8.20.247.20). It may also be possible to reach the RWTH VPN server, in which case please use VPN.
Wartung NOC-portal
wegen einer Wartung des Systems noc-portal werden einige unserer Webdienste zum Steuern der Internet Basisdienste kurzzeitig im Wartungszeitraum nicht zur Verfügung stehen.
Unter anderem sind betroffen:
* DNS-Admin
* DHCP- Admin
* RADIUS-Admin
* Interface-Admin
* Firewall-Admin & -Formular
* WLAN Gastaccounts (anlegen)
Wartung des Datenbankservers
Wegen einer Wartung des zugrundeliegenden Datenbankservers ist im Wartungszeitraum mit Ausfällen von Webdiensten zu rechnen:
* NOC-Portal (z.B. DNS-Admin, DHCP-Admin, RADIUS-Admin, Interface-Admin, WLAN Gäste einrichten)
* TK-Portal
* RA-Portal
Die Dienste laufen wie gewohnt weiter. Bitte versuchen Sie zu einem späteren Zeitpunkt Ihre gewünschten Änderungen einzutragen.
spezielle TXT-record (SPF, DKIM und DMARC) können nur noch beantragt werden
From 15.05.2024, the e-mail-specific TXT record for SPF, DKIM and DMARC can only be requested via the IT-ServiceDesk (servicedesk@itc.rwth-aachen.de).
All other TXT record values are still possible.
Reboot der DNS-Server wg. Kernel Update
Wegen eines Kernel-Updates ist ein reboot der Server nötig. Durch den hier verwendeten Anycast ist der Dienst wie auf https:
help.itc.rwth-aachen.de/service/rhjc72ly4wmw/article/89438b835bbb4c9fab1249e0b9a5c439/ angegeben ohne Unterbrechung nutzbar.