Release : All versions
Component : DESKTOP AND SERVER MANAGEMENT
There are a lot of Agents connected to the Scalability Server at the same time with following Configuration:
Mobile broadband adapter mobile radio:
Connection-specific DNS suffix:
Description . . . . . . . . . . . : HP lt4120 Snapdragon X5 LTE
Physical address. . . . . . . . . : AA-BB-CC-DD-EE-FF
DHCP activated. . . . . . . . . . : No.
Auto configuration activated. . . : Yes
IPv6 address. . . . . . . . . . . : xxxx: xx: xxxx: xxxx: xxxx: xxxx: xxxx: 51c7 (preferred)
Temporary IPv6 address. . . . . . : 2a00: 20: a03b: ed95: 652c: a8d: ac1e: cfa9 (preferred)
IPv6 address. . . . . . . . . . . : xxxx: xx: xxxx: xxxx: xxxx: xxxx: xxxx: 39a2 (provisional)
Connection-local IPv6 address . . : xxxx :: xxxx: xxxx: xxxx: 51c7% 14 (preferred)
IPv4 address. . . . . . . . . . . : x.x.x.32 (preferred)
Subnet mask. . . . . . . . . . . : x.x.x.192
Standard gateway. . . . . . . . . : xxxx: xx: xxxx: xxxx: xxx: xxxx: xxx: 3305
xxxx :: xxx: xxxx: xxx: 3305% 14
x.x.x.33
DHCPv6 IAID . . . . . . . . . . . : xxxxxxxx
DHCPv6 client DUID. . . . . . . . : xx-xx-xx-xx-xx-xx-xx-xx-xx-xx-xx-xx-xx-2E
DNS server. . . . . . . . . . . . : x: x: x: x :: 53
x: x: x: x :: 153
x.x.x.126
x.x.x.125
NetBIOS over TCP/IP . . . . . . . : Activated
Microsoft Windows tries to register it’s IP addresses for the network adapter in DNS using the primary DNS suffix of the clients , is for example, contoso.com (assigned to the domain join). The DNS Server assigned to the Wireless WAN adapter does not own the DNS zone contoso.com so the registering of the IP addresses in DNS will fail:
Protocol name: System
Source: Microsoft Windows DNS client
Date: May 18, 2020 6:05:36 PM
Event ID: 8015
Task category: (1028)
Level: warning
Keywords:
User: network service
Computer: CLW10.contoso.com
Description:
Failed to register host resource records (A or AAAA) for the network adapter with the following settings:
Adapter name: {A28005A0-F145-4A4D-9FD2-E0331325CA90}
Host name: CLW10
Primary domain suffix: contoso.com
DNS server list:
x: x: x: x :: 53, x: x: x: x :: 153, x.x.x.126, x.x.x.125
Sent update to Server: <?>
IP address(es):
xxxx: xx: xxxx: xxxx: xxxx: xxxx: xxxx: 51c7, xxxx: xx: xxxx: xxxx: xxxx: xxxx: xxxx: 39a2, x.x.x.32
The reason the system could not register these RRs was because the update request it sent to the DNS server timed out. The most likely cause of this is that the DNS server authoritative for the name it was attempting to register or update is not running at this time.
You can manually retry DNS registration of the network adapter and its settings by typing 'ipconfig /registerdns' at the command prompt. If problems still persist, contact your DNS server or network systems administrator.
The error in the registration of the IP addresses causes a complete renewal of the IP configuration for the Wireless WAN adapter. Among other things, this causes the temporary IPv6 address to be recreated.
This causes CAF to send a re-registration message from the Agent to the Scalability Server. This is done by CAF when the IP address list changes so it can notify the new IP address to the Scalability Server or look for a different one if the Location Awareness configuration policy is used.
With the renewal of the IP configuration of the Wireless WAN adapter, windows is attempting to register the IP addresses to DNS again. Therefore, this process is going into a cycle and CAF is sending every time a re-registration message to the Scalability Server. This process can be up to two times per second on an agent. In combination with the number of connected Agents to the Scalability Server at the same time, the huge number of messages to the Scalability Server causes the high CPU load.
In the CAF Service logs (TRC_CF_CAF_SERVICE_*.log), the change is detected and can show INFO level messages with the list of the available IP addresses like the following ones.
070420-06:53:59.5671564L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: System reports 7 addresses
070420-06:53:59.5671809L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( fe80::xxxx:xxxx:xxxx:a16%4 )
070420-06:53:59.5672374L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( xxx.xxx.xxx.244 )
070420-06:53:59.5672623L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( xxxx:xx:xxxx:xxxx:xxxx:xxxx:xxxx:a4e4 )
070420-06:53:59.5673188L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( fe80::xxx:xxxx:xxxx:f1fc%3 )
070420-06:53:59.5673429L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( xxx.xxx.xxx.84 )
070420-06:53:59.5674448L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( ::1 )
070420-06:53:59.5674724L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( 127.0.0.1 )
070420-06:53:59.5674985L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier:CheckIPAdresses: Old/New size 4/7; Old/new checksum: 28681/101274; rc: 1
070420-06:53:59.7008780L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: System reports 9 addresses
070420-06:53:59.7009021L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( fe80::xxxx:xxxx:xxxx:a16%4 )
070420-06:53:59.7010103L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( xxx.xxx.xxx.244 )
070420-06:53:59.7010391L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( xxxx:xx:xxxx:xxxx:xxxx:xxxx:xxxx:51c7 )
070420-06:53:59.7010676L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( xxxx:xx:xxxx:xxxx:xxxx:xxxx:xxxx:39a2 )
070420-06:53:59.7010944L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( xxxx:xx:xxxx:xxxx:xxxx:xxxx:xxxx:a4e4 )
070420-06:53:59.7011185L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( fe80::xxx:xxxx:xxxx:f1fc%3 )
070420-06:53:59.7011415L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( xxx.xxx.xxx.84 )
070420-06:53:59.7011640L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( ::1 )
070420-06:53:59.7011865L|003980|00001f88|CAF_SERVIC|cfNotify |cfNotify |000000|INFO | Notifier: IP address( 127.0.0.1 )
Deactivate the check box Register this connection's addresses in DNS in the Network Configuration Panel of the WWAN-Adapter: