// Copyright 2003-2005 Arthur van Hoff, Rick Blair
// Licensed under Apache License version 2.0
// Original license LGPL
package javax.jmdns.impl.constants;
/**
* DNS constants.
*
* @author Arthur van Hoff, Jeff Sonstein, Werner Randelshofer, Pierre Frisch, Rick Blair
*/
public final class DNSConstants {
// http://www.iana.org/assignments/dns-parameters
// changed to final class - jeffs
public static final String MDNS_GROUP = "224.0.0.251";
public static final String MDNS_GROUP_IPV6 = "FF02::FB";
public static final int MDNS_PORT = Integer.parseInt(System.getProperty("net.mdns.port", "5353"));
public static final int DNS_PORT = 53;
public static final int DNS_TTL = 60 * 60; // default one hour TTL
// public static final int DNS_TTL = 120 * 60; // two hour TTL (draft-cheshire-dnsext-multicastdns.txt ch 13)
public static final int MAX_MSG_TYPICAL = 1460;
public static final int MAX_MSG_ABSOLUTE = 8972;
public static final int FLAGS_QR_MASK = 0x8000; // Query response mask
public static final int FLAGS_QR_QUERY = 0x0000; // Query
public static final int FLAGS_QR_RESPONSE = 0x8000; // Response
public static final int FLAGS_AA = 0x0400; // Authorative answer
public static final int FLAGS_TC = 0x0200; // Truncated
public static final int FLAGS_RD = 0x0100; // Recursion desired
public static final int FLAGS_RA = 0x8000; // Recursion available
public static final int FLAGS_Z = 0x0040; // Zero
public static final int FLAGS_AD = 0x0020; // Authentic data
public static final int FLAGS_CD = 0x0010; // Checking disabled
// Time Intervals for various functions
public static final int SHARED_QUERY_TIME = 20; // milliseconds before send shared query
public static final int QUERY_WAIT_INTERVAL = 225; // milliseconds between query loops.
public static final int PROBE_WAIT_INTERVAL = 250; // milliseconds between probe loops.
public static final int RESPONSE_MIN_WAIT_INTERVAL = 20; // minimal wait interval for response.
public static final int RESPONSE_MAX_WAIT_INTERVAL = 115; // maximal wait interval for response
public static final int PROBE_CONFLICT_INTERVAL = 1000; // milliseconds to wait after conflict.
public static final int PROBE_THROTTLE_COUNT = 10; // After x tries go 1 time a sec. on probes.
public static final int PROBE_THROTTLE_COUNT_INTERVAL = 5000; // We only increment the throttle count, if the previous increment is inside this interval.
public static final int ANNOUNCE_WAIT_INTERVAL = 1000; // milliseconds between Announce loops.
public static final int RECORD_REAPER_INTERVAL = 10000; // milliseconds between cache cleanups.
public static final int RECORD_EXPIRY_DELAY = 1; // This is 1s delay used in ttl and therefore in seconds
public static final int KNOWN_ANSWER_TTL = 120;
public static final int ANNOUNCED_RENEWAL_TTL_INTERVAL = DNS_TTL * 500; // 50% of the TTL in milliseconds
public static final long CLOSE_TIMEOUT = ANNOUNCE_WAIT_INTERVAL * 5L;
public static final long SERVICE_INFO_TIMEOUT = ANNOUNCE_WAIT_INTERVAL * 6L;
public static final int NETWORK_CHECK_INTERVAL = 10 * 1000; // 10 secondes
}