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Configuring IP Utilities
2-26
304234-A Rev 00
How the DNS Cache Works
The DNS proxy caches DNS records to improve performance, reduce network
traffic, and free the real DNS server from repetitive requests. As with standard
DNS, entries expire based on the time-to-live (TTL) field in the DNS record. You
can configure the maximum number of cache entries. The default is 20.
When the DNS proxy receives a request, it searches its cache for the current
request. If an entry exists, the DNS proxy immediately returns the answer to the
client. If it does not find the entry, the DNS proxy sends a request to the real DNS
server. When the response comes back from the DNS server and the TTL is
greater than 0, the DNS proxy inserts the response into the cache and returns the
response to the client.
- Configuring IP Utilities 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 304234-A Rev 00 10
- Before You Begin 17
- Text Conventions 18
- Acronyms 20
- How to Get Help 21
- Chapter 1 23
- Starting IP Utilities 23
- Starting Configuration Tools 24
- Starting TCP Services 26
- Starting FTP Services 27
- Starting TFTP Services 29
- Starting Telnet Services 30
- Starting NTP Services 32
- Starting NetBIOS over IP 34
- Starting the DNS Client 35
- Starting the DNS Proxy Server 37
- Chapter 2 39
- Overview of IP Utilities 39
- How TCP Works 40
- TCP Features 41
- TCP and IP Service Users 44
- FTP Overview 45
- How FTP Works 46
- Networks routers 47
- TFTP Overview 48
- Telnet Overview 49
- Telnet Server 50
- Telnet Client 51
- Figure 2-4. Telnet Client 52
- NTP Overview 53
- NTP Modes of Operation 56
- NetBIOS Overview 58
- NetBIOS in an IP Environment 59
- DNS Overview 62
- DNS Proxy Server 62
- How the DNS Cache Works 64
- Chapter 3 65
- Customizing TCP Services 65
- Disabling and Reenabling TCP 66
- Chapter 4 73
- Customizing FTP Services 73
- Disabling and Reenabling FTP 74
- Chapter 5 83
- Customizing TFTP Services 83
- Chapter 6 91
- Pausing Telnet Console Output 99
- Using the BCC 100
- Using Site Manager 100
- Changing the Login Timeout 101
- Changing the Password Timeout 102
- Changing the Command Timeout 103
- Changing Login Retries 104
- Customizing Telnet Services 107
- Changing the History File 109
- Changing the Remote Port 112
- Changing the Command Prompt 113
- prompt system1 114
- Chapter 7 115
- Customizing NTP Services 115
- Disabling and Reenabling NTP 116
- Adding Remote Time Servers 119
- Setting Local Host Mode 122
- Specifying Peer Preference 124
- Chapter 8 131
- Customizing NetBIOS over IP 131
- Configuring a NetBIOS Cache 134
- 15-character entity 135
- Aging a Cache Entry 137
- Customizing a Cache Search 138
- Chapter 9 147
- Customizing the DNS Client 147
- Disabling the Recursion Bit 151
- Modifying the DNS Server List 153
- Deleting DNS from the Router 158
- Chapter 10 161
- Customizing the DNS Proxy 161
- Appendix A 163
- Site Manager Parameters 163
- TCP Global Parameters 164
- FTP Global Parameters 166
- TFTP Parameters 169
- NTP Parameters 178
- NetBIOS Global Parameters 182
- DNS Global Parameters 190
- DNS Server Record Parameters 194
- DNS Proxy Server Parameters 195
- IP Accounting Parameters 204
- Appendix B 207
- Site Manager Default Settings 207
- FTP Parameters 208
- Telnet Parameters 209
- NetBIOS over IP Parameters 211
- DNS Client Parameters 212
- DNS Server Parameters 213
- Appendix C 215
- Configuring IP Accounting on 215
- (continued) 217
- Appendix D 219
- Specifying the Policy Action 221
- Specifying the IP Service 222
- Specifying the Precedence 223
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