diff --git a/src/init.cpp b/src/init.cpp
index f3cb763ecc1..0ca94974bbf 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);
 
diff --git a/src/net.cpp b/src/net.cpp
index 6659b642466..d1df393ad3b 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1642,15 +1642,20 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
                 LOCK2(m_addr_fetches_mutex, m_added_nodes_mutex);
                 if (m_addr_fetches.empty() && m_added_nodes.empty()) {
                     add_fixed_seeds_now = true;
-                    LogPrintf("Adding fixed seeds as -dnsseed=0, -addnode is not provided and all -seednode(s) attempted\n");
+                    LogPrintf("Adding fixed seeds as -dnsseed=0 (or IPv4/IPv6 connections are disabled via -onlynet), -addnode is not provided and all -seednode(s) attempted\n");
                 }
             }
 
             if (add_fixed_seeds_now) {
+                std::vector<CAddress> seed_addrs{ConvertSeeds(Params().FixedSeeds())};
+                seed_addrs.erase(std::remove_if(seed_addrs.begin(), seed_addrs.end(),
+                                               [](const CAddress& addr) { return !IsReachable(addr); }),
+                                seed_addrs.end());
                 CNetAddr local;
                 local.SetInternal("fixedseeds");
-                addrman.Add(ConvertSeeds(Params().FixedSeeds()), local);
+                addrman.Add(seed_addrs, local);
                 add_fixed_seeds = false;
+                LogPrintf("Added %d fixed seeds from reachable networks.\n", seed_addrs.size());
             }
         }
 
diff --git a/test/functional/feature_config_args.py b/test/functional/feature_config_args.py
index 6c51a5ac315..eb31bca29ae 100755
--- a/test/functional/feature_config_args.py
+++ b/test/functional/feature_config_args.py
@@ -186,11 +186,12 @@ class ConfArgsTest(BitcoinTestFramework):
         with self.nodes[0].assert_debug_log(expected_msgs=[
                 "Loaded 0 addresses from peers.dat",
                 "DNS seeding disabled",
-                "Adding fixed seeds as -dnsseed=0, -addnode is not provided and all -seednode(s) attempted\n",
+                "Adding fixed seeds as -dnsseed=0 (or IPv4/IPv6 connections are disabled via -onlynet), -addnode is not provided and all -seednode(s) attempted\n",
         ]):
             self.start_node(0, extra_args=['-dnsseed=0', '-fixedseeds=1'])
         assert time.time() - start < 60
         self.stop_node(0)
+        self.nodes[0].assert_start_raises_init_error(['-dnsseed=1', '-onlynet=i2p', '-i2psam=127.0.0.1:7656'], "Error: Incompatible options: -dnsseed=1 was explicitly specified, but -onlynet forbids connections to IPv4/IPv6")
 
         # No peers.dat exists and dns seeds are disabled.
         # We expect the node will not add fixed seeds when explicitly disabled.