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Manual Chapter: Controlling Responses to ICMP Echo Requests
Manual Chapter
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Controlling Responses to ICMP Echo Requests

About ICMP echo responses on the BIG-IP system

You can control whether the BIG-IP® system sends responses to Internet Control Message Protocol (ICMP) echo requests, on a per-virtual address basis.

If you disable ICMP echo responses on a virtual address, the BIG-IP system never sends an ICMP echo response for an ICMP request packet sent to the virtual address, regardless of the state of any virtual servers associated with the virtual address. If you enable ICMP echo responses on a virtual address, the BIG-IP system always sends an ICMP echo response for an ICMP request packet sent to the virtual address, regardless of the state of any virtual servers associated with the virtual address.

Alternatively, you can selectively enable ICMP echo responses. Selectively enabling ICMP echo responses causes the BIG-IP system to internally enable or disable ICMP responses for the virtual address, based on which virtual server state you choose for enabling route advertisement. This table shows that for each possible virtual server state that you can specify to enable route advertisement for a virtual address, the system controls ICMP echo responses in a unique way.

Virtual server state for route advertisement ICMP echo response behavior
When any virtual server for that virtual address is available The BIG-IP system sends an ICMP echo response for a request sent to the virtual address, if one or more virtual severs associated with the virtual address is in an Up or Unknown state.
When all virtual servers for that virtual address are available The BIG-IP system always sends an ICMP echo response for a request sent to the virtual address, but only when all virtual servers are available.
When you want the system to always advertise a route to the virtual address The BIG-IP system always sends an ICMP echo response for a request sent to the virtual address, regardless of the state of any virtual servers associated with the virtual address.

Task summary

You can configure the BIG-IP system to control whether the system sends a response for each ICMP echo request that is sent to a BIG-IP virtual address.

Task list

Configuring ICMP echo responses for a virtual address

You perform this task to control the way that the BIG-IP® system controls responses to ICMP echo requests sent to an individual BIG-IP virtual address. Note that the way you configure route advertisement for the virtual address can affect the way that the system controls ICMP echo responses.

  1. On the Main tab, click Local Traffic > Virtual Servers .
    The Virtual Server List screen displays a list of existing virtual servers.
  2. On the menu bar, click Virtual Address List.
  3. Click the name of the virtual server you want to configure.
  4. For the ICMP Echo setting, choose a value:
    • If you choose Enabled, the BIG-IP system always sends an ICMP echo response for an ICMP request packet sent to the virtual address, regardless of the state of any virtual servers associated with the virtual address
    • If you choose Disabled, the BIG-IP system never sends an ICMP echo response for an ICMP request packet sent to the virtual address, regardless of the state of any virtual servers associated with the virtual address.
    • If you choose Selective and route advertisement on a virtual address is set to When any virtual server is available, the BIG-IP system sends an ICMP echo response for a request sent to the virtual address, if one or more virtual severs associated with the virtual address is in an Up or Unknown state.
    • If you choose Selective and route advertisement on a virtual address is set to When all virtual server(s) are available, the BIG-IP system always sends an ICMP echo response for a request sent to the virtual address, but only when all virtual servers are available.
    • If you choose Selective and route advertisement on a virtual address is set toAlways, the BIG-IP system always sends an ICMP echo response for a request sent to the virtual address, regardless of the state of any virtual servers associated with the virtual address.
    Important: For those choices that depend on virtual server status, you must configure each relevant virtual server to notify the virtual address of its status.
  5. Click Update.
After performing this task, the virtual address configuration specifies the behavior that you want the BIG-IP system to exhibit when controlling responses to ICMP echo requests.

Communicating virtual server status to a virtual address

You perform this task to control whether you want the BIG-IP® system to notify the associated virtual address of the virtual server status. The BIG-IP system uses this status to control the way that the system manages responses to any ICMP echo requests sent to the virtual address.

  1. On the Main tab, click Local Traffic > Virtual Servers .
    The Virtual Server List screen opens.
  2. Click the name of the virtual server you want to modify.
  3. Select or clear the Notify Status to Virtual Address check box.
    When you select this setting, the virtual server notifies its associated virtual address of its status with respect to pool member availability.
  4. Click Update to save the changes.
After you perform this task, the BIG-IP system reports the status of the virtual server to the associated virtual address.

Implementation results

After you complete the tasks in this implementation, the BIG-IP® system controls responses to ICMP echo requests according to the way that you configured the relevant virtual server and its virtual address.

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