Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP All
Known Affected Versions:
11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4
Fixed In:
11.6.0, 11.5.1 HF5
Opened: Feb 28, 2014 Severity: 2-Critical
Virtual Edition (VE) devices working in AWS can fail to obtain, and in some cases lose (unpredictably) their DNS resolver information and thus become unable to look up any DNS names when attempts are made to call external servers by name.
BIG-IP will be unable to make any API calls to EC2. In particular this affects high availability (HA) functionality of BIG-IP systems. For example, when, during failover, VIPs from one instance's interface are moved to another instance's interface. In this circumstance a failover does occur, but EC2 routes all IP traffic destined for the traffic group's VIPs to the BIG-IP system on which the traffic group was previously active.
VE devices working in AWS.
- In your VPC, go to 'DHCP Options sets'. - Create a new 'DHCP Options Sets' and configure domain-name as per the AWS documentation for DHCP Options Sets and domain-name-servers = AmazonProvidedDNS. - Modify your VPC to use these 'DHCP Options Sets' instead of the defaults.
An issue with handling DHCP information in virtual environments has been corrected.