Mediatrix 4104
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H A P T E R
10
DNS SRV Configuration
This chapter describes the configuration required for the Mediatrix 4104 to work with a DNS SRV.
What is a DNS SRV?
Currently, one must either know the exact address of a server to contact it, or broadcast a question.
DNS SRV is an extension of the standard DNS server. SRV (Service Record) is a type of entry a network
administrator may put into the DNS answers. A DNS SRV is used to get one or more IP addresses of servers,
each one having its own weight and priority.
Each server received when using DNS SRV, depending on its weight and priority, can be used as a primary
or backup server or can be part of a load balancing system.
For instance, the client requests the SRV for SIP servers in some domain. The DNS server may return the A,
B, and C addresses, which are all SIP servers. Each address has a weight and the client must choose one of
those three addresses by using a random algorithm that considers the weight.
To use DNS SRV, an administrator must set a service records (SRV) into the DNS servers available on the
network.
DNS SRV implementation should imply a shared database between servers since a REGISTER and an
INVITE can be sent to any server, not necessarily the same one.
DNS SRV applies to both TCP and UDP transport types.
Priority vs Weight
A DNS SRV uses the
priority
and
weight
concepts to distribute the requests.
Standards Supported
•
RFC 2782 – A DNS RR for specifying the location of services
(DNS SRV)
•
RFC 3263 - Session Initiation Protocol (SIP): Locating SIP
Servers
Table 108:
Priority vs. Weight
Parameter
Description
Priority
A client must attempt to contact the target host with the lowest-numbered priority it can
reach.
Weight
Specifies a relative weight for entries with the same priority. Larger weights should be
given a proportionately higher probability of being selected.
Содержание Mediatrix 4104
Страница 23: ...Installation and Web Page Configuration ...
Страница 24: ...Page Left Intentionally Blank ...
Страница 136: ...Chapter 5 Web Interface Telephony Miscellaneous 114 Mediatrix 4104 ...
Страница 144: ...Chapter 6 Web Interface Advanced STUN Configuration 122 Mediatrix 4104 ...
Страница 145: ...SNMP Configuration ...
Страница 146: ...Page Left Intentionally Blank ...
Страница 162: ...Chapter 7 MIB Structure and SNMP Sending Configuration Data to the Mediatrix 4104 140 Mediatrix 4104 ...
Страница 184: ...Chapter 8 IP Address and Network Configuration Ethernet Connection Speed 162 Mediatrix 4104 ...
Страница 196: ...Chapter 10 DNS SRV Configuration DNS SRV Oriented Settings 174 Mediatrix 4104 ...
Страница 226: ...Chapter 12 Configuration File Download Configuration File Example 204 Mediatrix 4104 ...
Страница 242: ...Chapter 13 Software Download Emergency Software Procedure 220 Mediatrix 4104 ...
Страница 268: ...Chapter 15 Voice Transmissions User Gain 246 Mediatrix 4104 ...
Страница 278: ...Chapter 17 Bypass Configuration Bypass Connector Settings 256 Mediatrix 4104 ...
Страница 322: ...Chapter 21 Digit Maps Digit Map Examples 300 Mediatrix 4104 ...
Страница 350: ...Chapter 24 Telephony Attributes Call Rejection 328 Mediatrix 4104 ...
Страница 362: ...Chapter 27 Quality of Service QoS VLAN 340 Mediatrix 4104 ...
Страница 366: ...Chapter 28 Syslog Daemon Syslog Daemon Configuration 344 Mediatrix 4104 ...
Страница 370: ...Chapter 29 Statistics RTP Statistics 348 Mediatrix 4104 ...
Страница 385: ...Appendices ...
Страница 386: ...Page Left Intentionally Blank ...
Страница 390: ...Appendix A Standards Compliance and Safety Information Disclaimers 368 Mediatrix 4104 RoHS China ...
Страница 394: ...Appendix A Standards Compliance and Safety Information Safety Recommendations 372 Mediatrix 4104 ...
Страница 400: ...Appendix B Standard Hardware Information Warranty 378 Mediatrix 4104 ...
Страница 404: ...Appendix C Cabling Considerations RJ 11 Telephone Cable 382 Mediatrix 4104 ...
Страница 446: ...Appendix E Glossary Wide Area Network WAN 424 Mediatrix 4104 ...