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TABLE 22-2
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XTypes Available Through xntpd
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XType 1 2 3 4 5 6 7 8 9 10 11 12 13 15 17 18 19 20 22 23 24 25 26 27
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RefID LCL GPS WWV WWVB TRUE IRIG CHU ---GPS GPS GPS IRIG ATOM * DATM ACTS WWV GPS PPS TPTB USNO * GPS MSFa
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The server entry indicates the primary server that this system prefers. The broadcast entry directs the server to broadcast messages to clients. The driftfile entry relates to a local clock s accuracy and its frequency offset. In both cases where XType appears in the first two lines, a legal value for a clock device must be inserted. The clock device could be one of the devices shown in Table 22-2. Once the settings for the NTP server have been modified, they should be saved in the file /etc/inet/ntp.conf. When started in debug mode, the NTP server produces the following output:
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/usr/lib/inet/xntpd -d tick = 10000, tickadj = 5, hz = 100 kernel vars: tickadj = 5, tick = 10000 adj_precision = 1, tvu_maxslew = 495, tsf_maxslew = 0.002070b9 create_sockets(123)
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Part V:
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bind() fd 19, family 2, port 123, addr 00000000, flags=1 bind() fd 20, family 2, port 123, addr 7f000001, flags=0 bind() fd 21, family 2, port 123, addr 0a401203, flags=1 init_io: maxactivefd 21 getconfig: Couldn't open </etc/inet/ntp.conf> report_event: system event 'event_restart' (0x01) status 'sync_alarm, sync_unspec, 1 event, event_unspec' (0xc010)
In this output, an error message is generated because the file /etc/inet/ntp.conf could not be found it s a common mistake not to copy across the template /etc/inet/ntp.server file to /etc/inet/ntp.conf! To observe the set of internal variables used by xntpd during its operation, the ntpq command can be used.
NTP Security
One of the main problems in tying all production time-management operations to a single primary server is the potential for crackers to either spoof a legitimate primary server and pretend to be the primary server or undertake a denial of service attack. Fortunately, NTP provides authentication procedures to ensure that only authorized servers and clients can access their peers and/or the primary server. In addition, the use of multiple authoritative sources, including a backup external hardware clock, can remove some of the problems associated with denial of service attacks after all, if an external network port is being blocked by an attacker or group of attackers, then the local standby can always be used. NTP security is ultimately based on trust relationships that are developed as part of an overall network design. In addition, a number of innovations in the NTP authentication system make it very difficult for a cracker to spoof a primary server. For example, the originate timestamp (the time at which the message was transmitted from a client) is equivalent to a one-time pad, although if the cracker has knowledge of previous timestamps, it may be possible, with sufficient CPU power, to successfully spoof a server. However, given the error-estimation procedures and methods for clients to select the most accurate server, it s unlikely that an attack would succeed.
Examples
The following examples show how to set up DHCP and NTP clients and servers.
Configuring a Solaris DHCP Server
The Solaris client (dhcpagent) and server (in.dhcpd) solution features backward compatibility with other methods already in use, particularly RARP and static configurations. In addition, the address of any workstation s network interfaces can be changed after the system has been booted. The dhcpagent client for Solaris features caching and automated lease renewal and is fully integrated with IP configuration (ifconfig). The in.dhcpd server for Solaris can provide both primary and secondary
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