diff --git a/controller/src/ctl/cfgblk.rs b/controller/src/ctl/cfgblk.rs
index ae310c1..c189387 100644
--- a/controller/src/ctl/cfgblk.rs
+++ b/controller/src/ctl/cfgblk.rs
@@ -1,7 +1,7 @@
 use crate::image::ImageInfo;
-use crate::shared::LaunchInfo;
 use anyhow::Result;
 use backhand::{FilesystemWriter, NodeHeader};
+use hypha::LaunchInfo;
 use log::trace;
 use std::fs;
 use std::fs::File;
diff --git a/controller/src/ctl/mod.rs b/controller/src/ctl/mod.rs
index 7d26719..fa1b4da 100644
--- a/controller/src/ctl/mod.rs
+++ b/controller/src/ctl/mod.rs
@@ -5,9 +5,9 @@ use crate::ctl::cfgblk::ConfigBlock;
 use crate::image::cache::ImageCache;
 use crate::image::name::ImageName;
 use crate::image::{ImageCompiler, ImageInfo};
-use crate::shared::{LaunchInfo, LaunchNetwork};
 use advmac::MacAddr6;
 use anyhow::{anyhow, Result};
+use hypha::{LaunchInfo, LaunchNetwork};
 use ipnetwork::Ipv4Network;
 use loopdev::LoopControl;
 use std::io::{Read, Write};
@@ -114,10 +114,9 @@ impl Controller {
         let cmdline_options = [if debug { "debug" } else { "quiet" }, "elevator=noop"];
         let cmdline = cmdline_options.join(" ");
 
-        let mac = MacAddr6::random()
-            .to_string()
-            .replace('-', ":")
-            .to_lowercase();
+        let mut mac = MacAddr6::random();
+        mac.set_local(true);
+        let mac = mac.to_string().replace('-', ":");
         let config = DomainConfig {
             backend_domid: 0,
             name: &name,
diff --git a/controller/src/lib.rs b/controller/src/lib.rs
index 9575c3e..4b327bc 100644
--- a/controller/src/lib.rs
+++ b/controller/src/lib.rs
@@ -1,4 +1,3 @@
 pub mod autoloop;
 pub mod ctl;
 pub mod image;
-pub mod shared;
diff --git a/controller/src/shared/mod.rs b/controller/src/shared/mod.rs
deleted file mode 100644
index 1281840..0000000
--- a/controller/src/shared/mod.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-use serde::{Deserialize, Serialize};
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct LaunchNetwork {
-    pub link: String,
-    pub ipv4: String,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct LaunchInfo {
-    pub network: Option<LaunchNetwork>,
-    pub env: Option<Vec<String>>,
-    pub run: Option<Vec<String>>,
-}
diff --git a/libs/xen/xencall/src/lib.rs b/libs/xen/xencall/src/lib.rs
index b745c9a..9082497 100644
--- a/libs/xen/xencall/src/lib.rs
+++ b/libs/xen/xencall/src/lib.rs
@@ -64,7 +64,7 @@ impl XenCall {
 
     pub fn hypercall(&self, op: c_ulong, arg: [c_ulong; 5]) -> Result<c_long> {
         trace!(
-            "call fd={} hypercall op={:#x}, arg={:?}",
+            "call fd={} hypercall op={:#x} arg={:?}",
             self.handle.as_raw_fd(),
             op,
             arg
diff --git a/network/src/lib.rs b/network/src/lib.rs
index 6c650f0..3f27f40 100644
--- a/network/src/lib.rs
+++ b/network/src/lib.rs
@@ -1,6 +1,7 @@
 use std::os::fd::AsRawFd;
 use std::panic::UnwindSafe;
 use std::str::FromStr;
+use std::sync::{Arc, Mutex};
 use std::time::Duration;
 use std::{panic, thread};
 
@@ -73,14 +74,10 @@ impl NetworkBackend {
     }
 
     pub fn run(mut self) -> Result<()> {
-        let interface = self.interface.clone();
         let result = panic::catch_unwind(move || self.run_maybe_panic());
 
         if result.is_err() {
-            return Err(anyhow!(
-                "network backend for interface {} encountered an error and is now shutdown",
-                interface
-            ));
+            return Err(anyhow!("network backend has terminated"));
         }
 
         result.unwrap()
@@ -109,7 +106,7 @@ impl NetworkBackend {
 
 impl NetworkService {
     pub async fn watch(&mut self) -> Result<()> {
-        let mut spawned: Vec<String> = Vec::new();
+        let spawned: Arc<Mutex<Vec<String>>> = Arc::new(Mutex::new(Vec::new()));
         let (connection, handle, _) = rtnetlink::new_connection()?;
         tokio::spawn(connection);
         loop {
@@ -131,25 +128,33 @@ impl NetworkService {
                     continue;
                 }
 
-                if spawned.contains(&name) {
-                    continue;
+                if let Ok(spawns) = spawned.lock() {
+                    if spawns.contains(&name) {
+                        continue;
+                    }
                 }
 
-                if let Err(error) = self.add_network_backend(&name).await {
+                if let Err(error) = self.add_network_backend(&name, spawned.clone()).await {
                     warn!(
                         "failed to initialize network backend for interface {}: {}",
                         name, error
                     );
                 }
 
-                spawned.push(name);
+                if let Ok(mut spawns) = spawned.lock() {
+                    spawns.push(name.clone());
+                }
             }
 
             sleep(Duration::from_secs(2)).await;
         }
     }
 
-    async fn add_network_backend(&mut self, interface: &str) -> Result<()> {
+    async fn add_network_backend(
+        &mut self,
+        interface: &str,
+        spawned: Arc<Mutex<Vec<String>>>,
+    ) -> Result<()> {
         let interface = interface.to_string();
         let mut network = NetworkBackend::new(&interface, &[&self.network])?;
         info!("initializing network backend for interface {}", interface);
@@ -163,6 +168,12 @@ impl NetworkService {
                     interface, error
                 );
             }
+
+            if let Ok(mut spawns) = spawned.lock() {
+                if let Some(position) = spawns.iter().position(|x| *x == interface) {
+                    spawns.remove(position);
+                }
+            }
         });
         Ok(())
     }