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Assessment Title
Rule Text
The A10 Networks ADC must use DNS Proxy mode when Global Server Load Balancing is used.
Description
Discussion Text
Unrelated or unneeded proxy services increase the attack vector and add excessive complexity to the securing of the device. Multiple application proxies can be installed on many devices. However, proxy types must be limited to related functions.
The A10 Networks ADC is capable of DNS-based Global Server Load Balancing (GSLB), which uses Domain Name Service (DNS) to expand load balancing to larger scales, including globally. Global Server Load Balancing can operate in either Proxy mode or Server mode. In Proxy mode, all DNS queries arriving at the DNS Proxy IP address are forwarded to the existing DNS server. In Server mode, the device directly responds to queries for specific service IP addresses in the GSLB zone and can reply with A, AAAA, MX, NS, PTR, SRV, and SOA records. For all other records, the ACOS device will attempt Proxy mode unless configured as fully authoritative.
The A10 Networks ADC is capable of DNS-based Global Server Load Balancing (GSLB), which uses Domain Name Service (DNS) to expand load balancing to larger scales, including globally. Global Server Load Balancing can operate in either Proxy mode or Server mode. In Proxy mode, all DNS queries arriving at the DNS Proxy IP address are forwarded to the existing DNS server. In Server mode, the device directly responds to queries for specific service IP addresses in the GSLB zone and can reply with A, AAAA, MX, NS, PTR, SRV, and SOA records. For all other records, the ACOS device will attempt Proxy mode unless configured as fully authoritative.
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