diff --git a/cmd/geth/consolecmd_test.go b/cmd/geth/consolecmd_test.go
index 4e1f6340a00..871e8c175fc 100644
--- a/cmd/geth/consolecmd_test.go
+++ b/cmd/geth/consolecmd_test.go
@@ -39,8 +39,9 @@ const (
 // child g gets a temporary data directory.
 func runMinimalGeth(t *testing.T, args ...string) *testgeth {
 	// --holesky to make the 'writing genesis to disk' faster (no accounts)
+	// --networkid=1337 to avoid cache bump
 	// --syncmode=full to avoid allocating fast sync bloom
-	allArgs := []string{"--holesky", "--authrpc.port", "0", "--syncmode=full", "--port", "0",
+	allArgs := []string{"--holesky", "--networkid", "1337", "--authrpc.port", "0", "--syncmode=full", "--port", "0",
 		"--nat", "none", "--nodiscover", "--maxpeers", "0", "--cache", "64",
 		"--datadir.minfreedisk", "0"}
 	return runGeth(t, append(allArgs, args...)...)
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 2a3d6af0624..52a48c8bc78 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -1609,8 +1609,8 @@ func setRequiredBlocks(ctx *cli.Context, cfg *ethconfig.Config) {
 
 // SetEthConfig applies eth-related command line flags to the config.
 func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
-	// Avoid conflicting network flags, don't allow network id override on preset networks
-	flags.CheckExclusive(ctx, MainnetFlag, DeveloperFlag, SepoliaFlag, HoleskyFlag, HoodiFlag, NetworkIdFlag, OverrideGenesisFlag)
+	// Avoid conflicting network flags
+	flags.CheckExclusive(ctx, MainnetFlag, DeveloperFlag, SepoliaFlag, HoleskyFlag, HoodiFlag, OverrideGenesisFlag)
 	flags.CheckExclusive(ctx, DeveloperFlag, ExternalSignerFlag) // Can't use both ephemeral unlocked and external signer
 
 	// Set configurations from CLI flags
@@ -1657,9 +1657,6 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 		}
 	}
 
-	if ctx.IsSet(NetworkIdFlag.Name) {
-		cfg.NetworkId = ctx.Uint64(NetworkIdFlag.Name)
-	}
 	if ctx.IsSet(CacheFlag.Name) || ctx.IsSet(CacheDatabaseFlag.Name) {
 		cfg.DatabaseCache = ctx.Int(CacheFlag.Name) * ctx.Int(CacheDatabaseFlag.Name) / 100
 	}
@@ -1909,10 +1906,18 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 		}
 		cfg.Genesis = genesis
 	default:
-		if cfg.NetworkId == 1 {
+		if ctx.Uint64(NetworkIdFlag.Name) == 1 {
 			SetDNSDiscoveryDefaults(cfg, params.MainnetGenesisHash)
 		}
 	}
+	if ctx.IsSet(NetworkIdFlag.Name) {
+		// Typically it's best to automatically set the network id to the chain id,
+		// by not passing the network id flag at all. Emit a warning when set
+		// explicitly in case overriding the network id is not the user's intention.
+		id := ctx.Uint64(NetworkIdFlag.Name)
+		log.Warn("Setting network id with flag", "id", id)
+		cfg.NetworkId = id
+	}
 	// Set any dangling config values
 	if ctx.String(CryptoKZGFlag.Name) != "gokzg" && ctx.String(CryptoKZGFlag.Name) != "ckzg" {
 		Fatalf("--%s flag must be 'gokzg' or 'ckzg'", CryptoKZGFlag.Name)