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StubZone: updated initial interval to 5 sec for quick start. Added log entry to indicate start of refresh. Updated RefreshZone() to use TCP transport for zone sync to avoid issues when primary server responds with partial glue records in additional section without TC set.

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This commit is contained in:
Shreyas Zare
2020-07-04 16:34:52 +05:30
parent 84c38dd3e4
commit df6d34817d
1 changed files with 18 additions and 3 deletions
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21
DnsServerCore/Dns/Zones/StubZone.cs
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@@ -34,7 +34,7 @@ namespace DnsServerCore.Dns.Zones
readonly object _refreshTimerLock = new object();
Timer _refreshTimer;
const int REFRESH_TIMER_INTERVAL = 10000;
const int REFRESH_TIMER_INTERVAL = 5000;
const int REFRESH_TIMEOUT = 10000;
const int REFRESH_RETRIES = 5;
@@ -192,8 +192,13 @@ namespace DnsServerCore.Dns.Zones
{
try
{
DnsClient client = new DnsClient(primaryNameServers);
{
LogManager log = _dnsServer.LogManager;
if (log != null)
log.Write("DNS Server has started zone refresh for stub zone: " + _name);
}
DnsClient client = new DnsClient(primaryNameServers);
client.Timeout = REFRESH_TIMEOUT;
client.Retries = REFRESH_RETRIES;
@@ -231,7 +236,17 @@ namespace DnsServerCore.Dns.Zones
return true;
}
//update available; do zone sync
//update available; do zone sync with TCP transport
List<NameServerAddress> tcpNameServers = new List<NameServerAddress>();
foreach (NameServerAddress nameServer in primaryNameServers)
tcpNameServers.Add(new NameServerAddress(nameServer, DnsTransportProtocol.Tcp));
primaryNameServers = tcpNameServers;
client = new DnsClient(primaryNameServers);
client.Timeout = REFRESH_TIMEOUT;
client.Retries = REFRESH_RETRIES;
DnsDatagram nsRequest = new DnsDatagram(0, false, DnsOpcode.StandardQuery, false, false, false, false, false, false, DnsResponseCode.NoError, new DnsQuestionRecord[] { new DnsQuestionRecord(_name, DnsResourceRecordType.NS, DnsClass.IN) });
DnsDatagram nsResponse = client.Resolve(nsRequest);