Home > Articles > Programming > General Programming/Other Languages

Like this article? We recommend

Design Considerations

IP network multipathing requires hardware and Solaris OE configuration. The following sections cover the design considerations for the hardware and the Solaris OE configuration.

IP network multipathing has the following requirements (discussed in more detail later in this section):

  • Solaris OE version 8 update 2 (10/00) or later.

  • Unique MAC addresses on each network interface.

  • Multiple network adapter interfaces (of similar type) on each subnet for a resilient configuration.

  • A network adapter group name.

  • Test addresses on every network interface.

  • Data addresses on every network interface.

  • Network interfaces should run in active mode, not standby.

In addition, there is a problem with ping in both: Solaris 8 OE update 2 (10/00), and Solaris 8 OE update 4 (04/01). This problem is fixed in Solaris 8 OE update 5 (07/01). The addendum in this article, The problem with ping, describes the problem in detail and offers three possible workarounds.

The terms test address and data address are used throughout this article. The purpose of the test addresses is to detect failure and recovery of an interface only. The test addresses are tied to each interface for this purpose. Test addresses should not be used for server-client communication. In addition, the data addresses migrate between interfaces in the event of an interface failure, and should be used exclusively for host-client communication.

Solaris OE Version

In this article, all testing, observations, and examples use the Solaris 8 OE update 2 (10/00) version except where otherwise stated.

Unique Ethernet MAC Addresses

The default configuration for Sun hardware is that all network interfaces (on a specific server) have the same Ethernet MAC address. If more than one network interface is to be connected to the same subnet, the default configuration must be changed to avoid a MAC address conflict. That is, each interface connected to the same subnet must have a different MAC address.

Network Adapter Selection

A resilient network configuration requires that two or more network interfaces be connected to the same subnet.


IP network multipathing can be configured with a single network interface; however, only failure detection will be operative.

To increase resilience (where the hardware configuration permits), network interfaces should be located on different I/O boards. Create a symmetrical configuration (pairing ports on I/O cards in a mirrored fashion) to avoid confusion. Therefore, ports with the same numbers will be connected to the same subnets and belong to the same IP network multipathing group.


IP network multipathing does not work with dissimilar network interfaces—for example, Token Ring with Ethernet, or SunATM_ interface with Token Ring, etc.

Network Adapter Group Name

Configuration of multiple network interfaces within Solaris OE is performed by grouping the interfaces into an IP network multipathing group. A name should be chosen for each group that describes the network function—for example, production, backup, administration, etc.

Test Addresses Definition

Test addresses must be defined for each interface. The in.mpathd daemon uses these addresses in the detection of network interface failures and repairs. A test address must be a valid routable address. For the purposes of fault detection and isolation, include the name of the device in the name of the test address. This way, a test address on qfe0 will have a "-qfe0" suffix as its name. These addresses should not be used for inbound connections, as they will not failover in the event of an interface failure. For this reason, do not advertise them in a naming service or by other means. It is, in fact, the use on the -failover flag during configuration that causes in.mpathd to choose these addresses as test addresses because they will not failover.

Data Address Definition

The IP network multipathing group requires addresses be defined for data communication between server and client. It is these data addresses that migrate between interfaces during a failure.

We recommend that you define data addresses for every interface in an IPMP group to allow IPMP to load spread outbound connections between all interfaces in the group. This means that connections will emanate from different IP addresses on the server. In a few cases, secure shell (SSH) is one, this will require additional consideration, for example all the IP addresses will need to be registered for SSH.

The second reason for defining data on every interface is to prevent a potential problem on Solaris 8 OE systems. This problem does not occur with Solaris 9 OE. It occurs where data addresses are defined on only one interface in an IPMP group. Should the interface where the data addresses are defined fail during system boot, an alternative working interface is potentially never recognized—the data addresses do not failover. This situation does not occur if an alternative interface within IPMP group has a data address configured.

Therefore, it is recommended to define data addresses for every interface in an IPMP group. Using the standby feature is not recommended because a standby interface by definition, may only have a test address defined.

Design Parameters

The parameters defined in TABLE 1 are used in the commands and examples throughout this article for configuration of IP network multipathing:

TABLE 1 IP Network Multipathing Configuration Parameters



Network adapter interfaces (active or standby) (I/O slot, port number) qfe0 (active) (slot 0, Port 0)
qfe4 (active) (slot 1, Port 0)
Group name Production
IP Address (name) interface (camelot) qfe0 (camelot-1) qfe4
Test address (name) qfe0 = (camelot-qfe0)
qfe4 = (camelot-qfe4)
Is the node to perform network routing? No

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020