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Configuring IP Utilities
7-14
308631-14.00 Rev 00
Specifying a Filter Type and IP Subnet Mask
The NTP filter type parameter allows you to specify whether to drop or accept
NTP timestamps destined for a local NTP client. By default, the filter type is set to
Restrict, which tells NTP to drop specific NTP timestamps destined for a local
NTP client based on its source IP address and source subnet mask.
For example, if you have 10 remote time servers broadcasting to a router and you
want to receive NTP timestamps from only three remote time servers, you can
restrict the other seven remote time servers.
When you set the Filter Type to Prefer, the local NTP client accepts packets
received from remote time servers.
The Mask parameter allows you to specify an IP subnet mask address to filter
NTP timestamps based on a source subnet.
Using Site Manager
To add access control to a time server, complete the following tasks:
6. Set the
Access IP Address
parameter.
Click on
Help
or see the parameter
descriptions on page A-18.
7. Click on
OK
. The source IP address of the remote time
server whose access you want to restrict
appears in the NTP Access Configuration
List window.
Site Manager Procedure
You do this System responds
1. In the Configuration Manager window,
choose
Protocols
.
The Protocols menu opens.
2. Choose
Global Protocols
. The Global Protocols menu opens.
3. Choose
NTP
. The NTP menu opens.
(continued)
Site Manager Procedure
(continued)
You do this System responds
- Configuring IP Utilities 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308631-14.00 Rev 00 10
- Before You Begin 17
- Text Conventions 18
- Acronyms 19
- Hard-Copy Technical Manuals 21
- 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 28
- Starting Telnet Services 30
- Starting NTP Services 32
- Starting NetBIOS over IP 33
- Starting the DNS Client 34
- 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
- Deleting TFTP from the Router 89
- 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
- Chapter 10 159
- Customizing the DNS Proxy 159
- Appendix A 161
- Site Manager Parameters 161
- Caution: 162
- TCP Global Parameters 163
- FTP Global Parameters 165
- TFTP Parameters 168
- NTP Parameters 177
- NetBIOS Global Parameters 181
- DNS Global Parameters 189
- DNS Server Record Parameters 193
- DNS Proxy Server Parameters 194
- IP Accounting Parameters 203
- Appendix B 205
- Configuring IP Accounting on 205
- (continued) 207
- Appendix C 209
- Specifying the IP Service 210
- Specifying the Policy Action 211
- Specifying the Precedence 211
- <ip_address/ip_mask> 212
- <state> 212
- Appendix D 215
- BCC show Commands 215
- Online Help for show Commands 216
- The output 222
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