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201 · Question #231

A BIG-IP Administrator configures a Virtual Server. Users report that they always receive a TCP RST packet to the BIG-IP system when attempting to connect to it. What is the possible reason for this i

The correct answer is B. The virtual server Type is set to Reject. Users receiving TCP RST packets when connecting to a virtual server indicates that the virtual server's 'Type' is configured to 'Reject', causing the BIG-IP system to actively refuse connections.

Section 5: Troubleshoot a BIG-IP System

Question

A BIG-IP Administrator configures a Virtual Server. Users report that they always receive a TCP RST packet to the BIG-IP system when attempting to connect to it. What is the possible reason for this issue?

Options

  • AThe virtual server Type is set to Internal
  • BThe virtual server Type is set to Reject
  • CThe virtual server Type is set to Drop
  • DThe virtual server Type is set to Stateless

How the community answered

(44 responses)
  • A
    7% (3)
  • B
    89% (39)
  • C
    2% (1)
  • D
    2% (1)

Why each option

Users receiving TCP RST packets when connecting to a virtual server indicates that the virtual server's 'Type' is configured to 'Reject', causing the BIG-IP system to actively refuse connections.

AThe virtual server Type is set to Internal

A virtual server Type of 'Internal' is typically for internal traffic processing or management, not for generating TCP RSTs for external client connection attempts.

BThe virtual server Type is set to RejectCorrect

When a virtual server's 'Type' is set to 'Reject', the BIG-IP system is explicitly configured to refuse connections. For TCP connections, this results in a TCP RST (reset) packet being sent back to the client, matching the reported behavior.

CThe virtual server Type is set to Drop

If the virtual server Type is set to 'Drop', the BIG-IP system silently discards incoming connections without sending any response, leading to client timeouts, not RST packets.

DThe virtual server Type is set to Stateless

'Stateless' is an option typically found in FastL4 profiles that affects connection tracking, not a primary virtual server 'Type' that explicitly dictates RST behavior for connection refusal.

Concept tested: Virtual Server Type configuration and TCP RST behavior

Source: https://techdocs.f5.com/en-us/big-ip-glossary/glossary-term-virtual-server.html

Topics

#virtual server#TCP RST#connection rejection#virtual server type

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