1 files changed, 17 insertions, 0 deletions
diff --git a/src/init.cpp b/src/init.cpp
index f3cb763ecc..0ca94974bb 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -723,6 +723,16 @@ void InitParameterInteraction(ArgsManager& args)
         if (args.SoftSetBoolArg("-whitelistrelay", true))
             LogPrintf("%s: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistrelay=1\n", __func__);
     }
+    if (args.IsArgSet("-onlynet")) {
+        const auto onlynets = args.GetArgs("-onlynet");
+        bool clearnet_reachable = std::any_of(onlynets.begin(), onlynets.end(), [](const auto& net) {
+            const auto n = ParseNetwork(net);
+            return n == NET_IPV4 || n == NET_IPV6;
+        });
+        if (!clearnet_reachable && args.SoftSetBoolArg("-dnsseed", false)) {
+            LogPrintf("%s: parameter interaction: -onlynet excludes IPv4 and IPv6 -> setting -dnsseed=0\n", __func__);
+        }
+    }
 }
 
 /**
@@ -1281,6 +1291,13 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
     // 2.1. -onlynet is not given or
     // 2.2. -onlynet=cjdns is given
 
+    // Requesting DNS seeds entails connecting to IPv4/IPv6, which -onlynet options may prohibit:
+    // If -dnsseed=1 is explicitly specified, abort. If it's left unspecified by the user, we skip
+    // the DNS seeds by adjusting -dnsseed in InitParameterInteraction.
+    if (args.GetBoolArg("-dnsseed") == true && !IsReachable(NET_IPV4) && !IsReachable(NET_IPV6)) {
+        return InitError(strprintf(_("Incompatible options: -dnsseed=1 was explicitly specified, but -onlynet forbids connections to IPv4/IPv6")));
+    };
+
     // Check for host lookup allowed before parsing any network related parameters
     fNameLookup = args.GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);