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-rw-r--r--src/init.cpp3
-rw-r--r--src/net.cpp12
2 files changed, 14 insertions, 1 deletions
diff --git a/src/init.cpp b/src/init.cpp
index 127529382f..14816f5016 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -240,7 +240,8 @@ std::string HelpMessage(HelpMessageMode mode)
strUsage += " -connect=<ip> " + _("Connect only to the specified node(s)") + "\n";
strUsage += " -discover " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n";
strUsage += " -dns " + _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + _("(default: 1)") + "\n";
- strUsage += " -dnsseed " + _("Find peers using DNS lookup (default: 1 unless -connect)") + "\n";
+ strUsage += " -dnsseed " + _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect)") + "\n";
+ strUsage += " -forcednsseed " + _("Always query for peer addresses via DNS lookup (default: 0)") + "\n";
strUsage += " -externalip=<ip> " + _("Specify your own public address") + "\n";
strUsage += " -listen " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n";
strUsage += " -maxconnections=<n> " + _("Maintain at most <n> connections to peers (default: 125)") + "\n";
diff --git a/src/net.cpp b/src/net.cpp
index e004fbeb73..62124514c8 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1221,6 +1221,18 @@ void MapPort(bool)
void ThreadDNSAddressSeed()
{
+ // goal: only query DNS seeds if address need is acute
+ if ((addrman.size() > 0) &&
+ (!GetBoolArg("-forcednsseed", false))) {
+ MilliSleep(11 * 1000);
+
+ LOCK(cs_vNodes);
+ if (vNodes.size() >= 2) {
+ LogPrintf("P2P peers available. Skipped DNS seeding.\n");
+ return;
+ }
+ }
+
const vector<CDNSSeedData> &vSeeds = Params().DNSSeeds();
int found = 0;