Table Of Contents
Release Notes for
Cisco Network Registrar 3.5(3.1)
Date May 30, 2000
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.
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:
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.
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.
World Wide Web
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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.
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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
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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.
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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
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.
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