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Cisco Network Registrar

Release Notes for Cisco CNS Network Registrar 3.5

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Table Of Contents

Release Notes for
Cisco Network Registrar 3.5(3.1)

Contents

Introduction

New and Changed Information

New Software Feature in Release 3.5(3.1)

Changed in Release 3.5(3.1)

Obtaining Documentation

World Wide Web

Documentation CD-ROM

Ordering Documentation

Obtaining Technical Assistance

Cisco Connection Online

Technical Assistance Center

Documentation Feedback

Release Notes for
Cisco Network Registrar 3.5(3.1)


Date May 30, 2000

Contents

Introduction

These release notes describe what is new and what is fixed in Cisco Network Registrar 3.5(3.1).

New and Changed Information

This section describes the new software feature in Release 3.5(3.1) and a change that fixes an interoperability issue with BIND 8.2.2p5.

New Software Feature in Release 3.5(3.1)

This release of the software enables you to forward DHCP traffic from one DHCP server to another under the control of a Network Registrar extension. The DHCP forwarding feature is important in situations where the other server is not one that you manage. This is most likely to occur in environments where multiple vendors supply DHCP services for clients on the same virtual LAN.

DHCP Forwarding

The DHCP forwarding feature works in the following way:

1. When DHCP is initialized, the server opens a UDP socket, which it uses to send forwarded packets. To support servers with multiple IP addresses, the socket address pair consists of INADDR_ANY and any port number. This enables clients to use any one of the server's IP addresses.

2. When the DHCP server receives a request from a client, it processes these extension point scripts:

post-packet-decode

pre-client-lookup

post-client-lookup

As the DHCP server processes these scripts, it checks the environment dictionary for this string:

cnr-forward-dhcp-request 

3. If it finds that string and the string has the value true, the server calls its forwarding code.

4. The forwarding code checks the environment dictionary for a string with the following key:

cnr-request-forward-address-list 

It expects a list of comma-separated IP addresses with an optional colon-delimited port number, as in the following example:

192.168.168.15:1025,192.168.169.20:1027 

The default port is the server's default server port. The server sends a copy of the entire client request to each IP address and port in turn. If any element in the list is invalid, the server stops trying to parse the list.

5. After the forwarding code returns, the server stops processing the request. In the post-client-lookup extension point script, however, an optional log message with client-entry details might be created.

For more information about extension points in Network Registrar, see the Network Registrar CLI Reference Guide.

Changed in Release 3.5(3.1)

This release of the software fixes an interoperability issue (CSCdr23643) that involves incremental zone transfer (IXFR) and that is due to a problem in BIND 8.2.2p5.

IXFR Workaround

When BIND 8.2.2p5 responds to an IXFR query, it erroneously returns the value AXFR (full zone transfer) in the Question field of the response packet. Network Registrar adheres to RFC 1995, so it expects the value IXFR in that field and, therefore, rejects the BIND 8.2.2p5 response of AXFR.

Network Registrar now provides a workaround using the CLI. At the command line, enter:

nrcmd>dns enable relax-ixfr-query-validation 

Network Registrar then allows IXFR responses with either an IXFR or AXFR in the Question field.

Obtaining Documentation

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.

Documentation CD-ROM

Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly. Therefore, it is probably more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.

Ordering Documentation

Registered CCO users can order the Documentation CD-ROM and other Cisco Product documentation through our online Subscription Services at http://www.cisco.com/pcgi-bin/subcat/kaojump.cgi.

Nonregistered CCO users can order documentation through a local account representative by calling Cisco's corporate headquarters (California, USA) at 408 526-4000 or, in North America, call 800 553-NETS (6387).

Obtaining Technical Assistance

Cisco provides Cisco Connection Online (CCO) as a starting point for all technical assistance. Warranty or maintenance contract customers can use the Technical Assistance Center. All customers can submit technical feedback on Cisco documentation using the web, e-mail, a self-addressed stamped response card included in many printed documents, or by sending mail to Cisco.

Cisco Connection Online

Cisco continues to revolutionize how business is done on the Internet. Cisco Connection Online is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.

CCO's broad range of features and services helps customers and partners to streamline business processes and improve productivity. Through CCO, you will find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online support services, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.

Customers and partners can self-register on CCO to obtain additional personalized information and services. Registered users may order products, check on the status of an order and view benefits specific to their relationships with Cisco.

You can access CCO in the following ways:

WWW: www.cisco.com

Telnet: cco.cisco.com

Modem using standard connection rates and the following terminal settings: VT100 emulation; 8 data bits; no parity; and 1 stop bit.

From North America, call 408 526-8070

From Europe, call 33 1 64 46 40 82

You can e-mail questions about using CCO to cco-team@cisco.com.

Technical Assistance Center

The Cisco Technical Assistance Center (TAC) is available to warranty or maintenance contract customers who need technical assistance with a Cisco product that is under warranty or covered by a maintenance contract.

To display the TAC web site that includes links to technical support information and software upgrades and for requesting TAC support, use www.cisco.com/techsupport.

To contact by e-mail, use one of the following:

Language
E-mail Address

English

tac@cisco.com

Hanzi (Chinese)

chinese-tac@cisco.com

Kanji (Japanese)

japan-tac@cisco.com

Hangul (Korean)

korea-tac@cisco.com

Spanish

tac@cisco.com

Thai

thai-tac@cisco.com


In North America, TAC can be reached at 800 553-2447 or 408 526-7209. For other telephone numbers and TAC e-mail addresses worldwide, consult the following web site: http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.

Documentation Feedback

If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.

You can e-mail your comments to bug-doc@cisco.com.

To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments to the following address:

Cisco Systems, Inc.
Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883

We appreciate and value your comments.