diff --git i/src/config/mod.rs w/src/config/mod.rs
index dccc116..be2c634 100644
--- i/src/config/mod.rs
+++ w/src/config/mod.rs
@@ -4783,3 +4783,61 @@ node:
         );
     }
 }
+
+#[cfg(test)]
+mod archy_config_compatibility {
+    use super::*;
+    #[test]
+    fn archy_generated_node_config_keeps_current_lookup_defaults() {
+        let config = Config::parse_text(Path::new("fips.yaml"), r#"# Generated by archipelago — do not edit by hand.
+# Regenerated on every key change and daemon upgrade.
+node:
+  identity:
+    persistent: true
+  discovery:
+    timeout_secs: 5
+    backoff_base_secs: 0
+    backoff_max_secs: 0
+    retry_interval_secs: 2
+    max_attempts: 3
+    lan:
+      enabled: true
+    nostr:
+      enabled: true
+      advertise: true
+      policy: configured_only
+      share_local_candidates: false
+  retry:
+    base_interval_secs: 1
+    max_backoff_secs: 30
+    max_retries: 30
+  rate_limit:
+    handshake_resend_interval_ms: 400
+    handshake_resend_backoff: 1.5
+    handshake_max_resends: 10
+tun:
+  enabled: true
+  name: fips0
+  mtu: 1280
+dns:
+  enabled: true
+  bind_addr: 127.0.0.1
+transports:
+  udp:
+    bind_addr: 0.0.0.0:2121
+  tcp:
+    bind_addr: 0.0.0.0:8443
+peers: []
+"#).unwrap();
+        assert_eq!(config.node.lookup.attempt_timeouts_secs, vec![1, 2, 4, 8]);
+        assert_eq!(config.node.lookup.backoff_base_secs, 0);
+        assert_eq!(config.node.lookup.backoff_max_secs, 0);
+        assert!(config.node.rendezvous.lan.enabled);
+        assert!(config.node.rendezvous.nostr.enabled);
+        assert!(config.node.rendezvous.nostr.advertise);
+        assert!(!config.node.rendezvous.nostr.share_local_candidates);
+        assert_eq!(config.node.rendezvous.nostr.policy, NostrRendezvousPolicy::ConfiguredOnly);
+        assert_eq!(config.node.retry.base_interval_secs, 1);
+        assert_eq!(config.node.rate_limit.handshake_resend_interval_ms, 400);
+    }
+}