diff --git a/harmony-rs/Cargo.lock b/harmony-rs/Cargo.lock
index 6831b38..22e902d 100644
--- a/harmony-rs/Cargo.lock
+++ b/harmony-rs/Cargo.lock
@@ -895,6 +895,7 @@ dependencies = [
  "env_logger",
  "libredfish",
  "log",
+ "opnsense-config",
  "reqwest",
  "russh",
  "rust-ipmi",
@@ -902,7 +903,6 @@ dependencies = [
  "serde",
  "serde_json",
  "tokio",
- "xml_dom",
 ]
 
 [[package]]
@@ -1627,15 +1627,6 @@ dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "quick-xml"
-version = "0.36.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f7649a7b4df05aed9ea7ec6f628c67c9953a43869b8bc50929569b2999d443fe"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "quote"
 version = "1.0.37"
@@ -2430,21 +2421,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
 dependencies = [
  "pin-project-lite",
- "tracing-attributes",
  "tracing-core",
 ]
 
-[[package]]
-name = "tracing-attributes"
-version = "0.1.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.77",
-]
-
 [[package]]
 name = "tracing-core"
 version = "0.1.32"
@@ -2822,18 +2801,6 @@ version = "0.8.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "af4e2e2f7cba5a093896c1e150fbfe177d1883e7448200efb81d40b9d339ef26"
 
-[[package]]
-name = "xml_dom"
-version = "0.2.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "836bd445caf6b9e969199f2a9667d58b433b286ddb515764303ab75a6d17e51f"
-dependencies = [
- "log",
- "quick-xml",
- "regex",
- "tracing",
-]
-
 [[package]]
 name = "yansi"
 version = "1.0.1"
diff --git a/harmony-rs/Cargo.toml b/harmony-rs/Cargo.toml
index bd5e6b8..20aba71 100644
--- a/harmony-rs/Cargo.toml
+++ b/harmony-rs/Cargo.toml
@@ -18,6 +18,8 @@ derive-new = "0.7.0"
 async-trait = "0.1.82"
 tokio = { version = "1.40.0", features = ["io-std"] }
 cidr = "0.2.3"
-xml_dom = "0.2.8"
 russh = "0.45.0"
 russh-keys = "0.45.0"
+
+#[workspace.target.x86_64-unknown-linux-gnu]
+#rustflags = ["-C", "link-arg=-fuse-ld=mold"]
diff --git a/harmony-rs/harmony/Cargo.toml b/harmony-rs/harmony/Cargo.toml
index 5917bdf..8029cf1 100644
--- a/harmony-rs/harmony/Cargo.toml
+++ b/harmony-rs/harmony/Cargo.toml
@@ -17,4 +17,4 @@ log = { workspace = true }
 env_logger = { workspace = true }
 async-trait = { workspace = true }
 cidr = { workspace = true }
-xml_dom = { workspace = true }
+opnsense-config = { path = "../opnsense-config" }
diff --git a/harmony-rs/harmony/src/domain/topology/mod.rs b/harmony-rs/harmony/src/domain/topology/mod.rs
index bd4a172..bfb9c96 100644
--- a/harmony-rs/harmony/src/domain/topology/mod.rs
+++ b/harmony-rs/harmony/src/domain/topology/mod.rs
@@ -22,6 +22,7 @@ pub struct HAClusterTopology {
 }
 
 pub type IpAddress = IpAddr;
+
 /// Represents a logical member of a cluster that provides one or more services.
 ///
 /// A LogicalHost can represent various roles within the infrastructure, such as:
diff --git a/harmony-rs/harmony/src/domain/topology/network.rs b/harmony-rs/harmony/src/domain/topology/network.rs
index 8096af9..be55f37 100644
--- a/harmony-rs/harmony/src/domain/topology/network.rs
+++ b/harmony-rs/harmony/src/domain/topology/network.rs
@@ -1,3 +1,5 @@
+use std::net::Ipv4Addr;
+
 use async_trait::async_trait;
 
 use crate::executors::ExecutorError;
@@ -8,12 +10,15 @@ use super::{IpAddress, LogicalHost};
 pub struct DHCPStaticEntry {
     pub name: String,
     pub mac: MacAddress,
-    pub ip: IpAddress,
+    pub ip: Ipv4Addr,
 }
 
 impl std::fmt::Display for DHCPStaticEntry {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.write_fmt(format_args!("DHCPStaticEntry : name {}, mac {}, ip {}", self.name, self.mac, self.ip))
+        f.write_fmt(format_args!(
+            "DHCPStaticEntry : name {}, mac {}, ip {}",
+            self.name, self.mac, self.ip
+        ))
     }
 }
 
@@ -57,7 +62,11 @@ pub trait DnsServer: Send + Sync {
         record_type: DnsRecordType,
         value: &str,
     ) -> Result<(), ExecutorError>;
-    fn remove_record(&mut self, name: &str, record_type: DnsRecordType) -> Result<(), ExecutorError>;
+    fn remove_record(
+        &mut self,
+        name: &str,
+        record_type: DnsRecordType,
+    ) -> Result<(), ExecutorError>;
     fn list_records(&self) -> Vec<DnsRecord>;
     fn get_ip(&self) -> IpAddress;
     fn get_host(&self) -> LogicalHost;
@@ -98,11 +107,21 @@ pub struct MacAddress(pub [u8; 6]);
 // MacAddress::from!("00:90:7f:df:2c:23"),
 
 impl MacAddress {
+    #[cfg(test)]
     pub fn dummy() -> Self {
         Self([0, 0, 0, 0, 0, 0])
     }
 }
 
+impl From<&MacAddress> for String {
+    fn from(value: &MacAddress) -> Self {
+        format!(
+            "{}:{}:{}:{}:{}:{}",
+            value.0[0], value.0[1], value.0[2], value.0[3], value.0[4], value.0[5]
+        )
+    }
+}
+
 impl std::fmt::Display for MacAddress {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.write_fmt(format_args!(
diff --git a/harmony-rs/harmony/src/infra/opnsense/config.rs b/harmony-rs/harmony/src/infra/opnsense/config.rs
deleted file mode 100644
index 309e59d..0000000
--- a/harmony-rs/harmony/src/infra/opnsense/config.rs
+++ /dev/null
@@ -1,43 +0,0 @@
-use crate::executors::ExecutorError;
-
-pub struct OPNSenseXmlConfigEditor;
-
-impl OPNSenseXmlConfigEditor {
-    pub(crate) async fn add(vec: Vec<&str>, xml_entry: &str) -> Result<(), ExecutorError>{
-        todo!()
-    }
-}
-
-#[cfg(test)]
-mod test {
-    use std::fs;
-    use std::io::{BufReader, Read};
-    use std::process::Command;
-
-    use xml_dom::parser::read_xml;
-
-    // #[test]
-    // fn should_not_alter_config() {
-    //     let path = "./private_repos/affilium_mcd/private/config.xml";
-    //     //  TODO
-    //     //  Load file to string
-    //     //  Parse with minidom (ex: `let root: Element = file_str.parse().unwrap()`)
-    //     //  save file with suffix name
-    //     //  Verify that file is still identical with md5sum after removing indentation
-    // }
-
-    #[test]
-    fn should_not_alter_config() {
-        let path = "/home/jeangab/work/nationtech/harmony/harmony-rs/affilium_mcd/private/config.xml";
-        let output_path = format!("{}.test_output", path);
-
-        // Load file to string
-        let file_str = fs::read_to_string(path).expect("Failed to read file");
-
-        // Parse with minidom
-        let root = read_xml(&file_str).unwrap();
-
-        assert_eq!(&root.to_string(), &file_str);
-    }
-
-}
diff --git a/harmony-rs/harmony/src/infra/opnsense/mod.rs b/harmony-rs/harmony/src/infra/opnsense/mod.rs
index fd7bd6c..66b00e6 100644
--- a/harmony-rs/harmony/src/infra/opnsense/mod.rs
+++ b/harmony-rs/harmony/src/infra/opnsense/mod.rs
@@ -1,18 +1,21 @@
 mod management;
-mod config;
+use std::sync::{Arc, Mutex, RwLock, RwLockWriteGuard};
+
 use async_trait::async_trait;
+use log::debug;
 pub use management::*;
 
 use crate::{
-    executors::ExecutorError, infra::opnsense::config::OPNSenseXmlConfigEditor, topology::{
+    executors::ExecutorError,
+    topology::{
         Backend, DHCPStaticEntry, DhcpServer, DnsServer, Firewall, FirewallRule, Frontend,
         IpAddress, LoadBalancer, LogicalHost,
-    }
+    },
 };
-use derive_new::new;
 
-#[derive(new, Clone)]
+#[derive(Clone)]
 pub struct OPNSenseFirewall {
+    opnsense_config: Arc<RwLock<opnsense_config::Config>>,
     host: LogicalHost,
     cluster_nic_name: String,
 }
@@ -22,6 +25,20 @@ impl OPNSenseFirewall {
         self.host.ip
     }
 
+    pub async fn new(
+        host: LogicalHost,
+        cluster_nic_name: &str,
+        username: &str,
+        password: &str,
+    ) -> Self {
+        Self {
+            opnsense_config: Arc::new(RwLock::new(
+                opnsense_config::Config::from_credentials(host.ip, username, password).await,
+            )),
+            host,
+            cluster_nic_name: cluster_nic_name.into(),
+        }
+    }
 }
 
 impl Firewall for OPNSenseFirewall {
@@ -81,27 +98,17 @@ impl LoadBalancer for OPNSenseFirewall {
 #[async_trait]
 impl DhcpServer for OPNSenseFirewall {
     async fn add_static_mapping(&self, entry: &DHCPStaticEntry) -> Result<(), ExecutorError> {
-        let mac = &entry.mac;
-        let name = &entry.name;
-        let ip = &entry.ip;
+        let mac: String = String::from(&entry.mac);
 
-        let xml_entry = format!(
-            "<staticmap>
-          <mac>{mac}</mac>
-          <ipaddr>{ip}</ipaddr>
-          <hostname>{name}</hostname>
-          <descr>{name}</descr>
-          <winsserver/>
-          <dnsserver/>
-          <ntpserver/>
-        </staticmap>"
-        );
-        // XML Path : <opnsense><dhcpd><DHCPD_INTERFACE_NAME><staticmap>
-        OPNSenseXmlConfigEditor::add(
-            vec!["opnsense", "dhcpd", &self.cluster_nic_name, "staticmap"],
-            &xml_entry,
-        ).await?;
-        todo!("Register {:?}", entry)
+        {
+            let mut writable_opnsense = self.opnsense_config.write().unwrap();
+            writable_opnsense
+                .dhcp()
+                .add_static_mapping(&mac, entry.ip, &entry.name).unwrap();
+        }
+
+        debug!("Registered {:?}", entry);
+        Ok(())
     }
 
     async fn remove_static_mapping(
@@ -122,6 +129,7 @@ impl DhcpServer for OPNSenseFirewall {
         self.host.clone()
     }
 }
+
 impl DnsServer for OPNSenseFirewall {
     fn add_record(
         &mut self,
diff --git a/harmony-rs/harmony/src/modules/dhcp.rs b/harmony-rs/harmony/src/modules/dhcp.rs
index 246576b..37e49cb 100644
--- a/harmony-rs/harmony/src/modules/dhcp.rs
+++ b/harmony-rs/harmony/src/modules/dhcp.rs
@@ -1,4 +1,4 @@
-use std::sync::Arc;
+use std::{net::Ipv4Addr, sync::Arc};
 
 use async_trait::async_trait;
 use derive_new::new;
@@ -120,10 +120,17 @@ impl Interpret for DhcpInterpret {
             .score
             .host_binding
             .iter()
-            .map(|binding| DHCPStaticEntry {
-                name: binding.logical_host.name.clone(),
-                mac: binding.physical_host.cluster_mac(),
-                ip: binding.logical_host.ip,
+            .map(|binding| {
+                let ip = match binding.logical_host.ip {
+                    std::net::IpAddr::V4(ipv4) => ipv4,
+                    std::net::IpAddr::V6(_) => unimplemented!("DHCPStaticEntry only supports ipv4 at the moment"),
+                };
+
+                DHCPStaticEntry {
+                    name: binding.logical_host.name.clone(),
+                    mac: binding.physical_host.cluster_mac(),
+                    ip,
+                }
             })
             .collect();
         info!("DHCPStaticEntry : {:?}", dhcp_entries);
@@ -136,6 +143,7 @@ impl Interpret for DhcpInterpret {
                 Err(_) => todo!(),
             }
         }
+
         todo!("Configure DHCPServer");
 
         Ok(Outcome::new(
diff --git a/harmony-rs/opnsense-config-xml/Cargo.toml b/harmony-rs/opnsense-config-xml/Cargo.toml
index a193f0c..3b28dcb 100644
--- a/harmony-rs/opnsense-config-xml/Cargo.toml
+++ b/harmony-rs/opnsense-config-xml/Cargo.toml
@@ -20,3 +20,6 @@ tokio = { workspace = true }
 
 [dev-dependencies]
 pretty_assertions = "1.4.1"
+
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-C", "link-arg=-fuse-ld=mold"]
diff --git a/harmony-rs/opnsense-config/src/config/config.rs b/harmony-rs/opnsense-config/src/config/config.rs
index 29dbd29..b38fa29 100644
--- a/harmony-rs/opnsense-config/src/config/config.rs
+++ b/harmony-rs/opnsense-config/src/config/config.rs
@@ -1,8 +1,9 @@
-use std::sync::Arc;
+use std::{net::Ipv4Addr, sync::Arc, time::Duration};
 
-use crate::{error::Error, modules::dhcp::DhcpConfig};
+use crate::{config::{SshConfigManager, SshCredentials, SshOPNSenseShell}, error::Error, modules::dhcp::DhcpConfig};
 use log::trace;
 use opnsense_config_xml::OPNsense;
+use russh::client;
 
 use super::{ConfigManager, OPNsenseShell};
 
@@ -39,6 +40,27 @@ impl Config {
             .apply_new_config(&self.opnsense.to_xml())
             .await
     }
+
+    pub async fn from_credentials(ipaddr: std::net::IpAddr, username: &str, password: &str) -> Self {
+        let config = Arc::new(client::Config {
+            inactivity_timeout: Some(Duration::from_secs(5)),
+            ..<_>::default()
+        });
+
+        let credentials = SshCredentials::Password {
+            username: String::from(username),
+            password: String::from(password),
+        };
+
+        let shell = Arc::new(SshOPNSenseShell::new(
+            (ipaddr, 22),
+            credentials,
+            config,
+        ));
+        let manager = Arc::new(SshConfigManager::new(shell.clone()));
+
+        Config::new(manager, shell).await.unwrap()
+    }
 }
 
 #[cfg(test)]
diff --git a/harmony-rs/opnsense-config/src/config/manager/mod.rs b/harmony-rs/opnsense-config/src/config/manager/mod.rs
index 4ac2142..42f95ca 100644
--- a/harmony-rs/opnsense-config/src/config/manager/mod.rs
+++ b/harmony-rs/opnsense-config/src/config/manager/mod.rs
@@ -7,7 +7,7 @@ pub use local_file::*;
 use crate::Error;
 
 #[async_trait]
-pub trait ConfigManager: std::fmt::Debug {
+pub trait ConfigManager: std::fmt::Debug + Send + Sync {
     async fn load_as_str(&self) -> Result<String, Error>;
     async fn apply_new_config(&self, content: &str) -> Result<(), Error>;
 }
diff --git a/harmony-rs/opnsense-config/src/config/shell/ssh.rs b/harmony-rs/opnsense-config/src/config/shell/ssh.rs
index 62ff391..453231c 100644
--- a/harmony-rs/opnsense-config/src/config/shell/ssh.rs
+++ b/harmony-rs/opnsense-config/src/config/shell/ssh.rs
@@ -1,5 +1,5 @@
 use std::{
-    net::Ipv4Addr,
+    net::IpAddr,
     sync::Arc,
     time::{SystemTime, UNIX_EPOCH},
 };
@@ -20,7 +20,7 @@ use super::OPNsenseShell;
 
 #[derive(Debug)]
 pub struct SshOPNSenseShell {
-    host: (Ipv4Addr, u16),
+    host: (IpAddr, u16),
     credentials: SshCredentials,
     ssh_config: Arc<Config>,
 }
@@ -78,11 +78,7 @@ impl SshOPNSenseShell {
         wait_for_completion(&mut channel).await
     }
 
-    pub fn new(
-        host: (Ipv4Addr, u16),
-        credentials: SshCredentials,
-        ssh_config: Arc<Config>,
-    ) -> Self {
+    pub fn new(host: (IpAddr, u16), credentials: SshCredentials, ssh_config: Arc<Config>) -> Self {
         Self {
             host,
             credentials,
diff --git a/harmony-rs/opnsense-config/src/lib.rs b/harmony-rs/opnsense-config/src/lib.rs
index 00a411b..59a378e 100644
--- a/harmony-rs/opnsense-config/src/lib.rs
+++ b/harmony-rs/opnsense-config/src/lib.rs
@@ -6,15 +6,10 @@ pub use config::Config;
 pub use error::Error;
 #[cfg(test)]
 mod test {
-    use config::SshConfigManager;
     use opnsense_config_xml::StaticMap;
-    use russh::client;
-    use std::{net::Ipv4Addr, sync::Arc, time::Duration};
+    use std::net::Ipv4Addr;
 
-    use crate::{
-        config::{self, SshCredentials, SshOPNSenseShell},
-        Config,
-    };
+    use crate::Config;
     use pretty_assertions::assert_eq;
 
     #[tokio::test]
@@ -38,23 +33,7 @@ mod test {
     }
 
     async fn initialize_config() -> Config {
-        let config = Arc::new(client::Config {
-            inactivity_timeout: Some(Duration::from_secs(5)),
-            ..<_>::default()
-        });
-
-        let credentials = SshCredentials::Password {
-            username: String::from("root"),
-            password: String::from("opnsense"),
-        };
-
-        let shell = Arc::new(SshOPNSenseShell::new(
-            (Ipv4Addr::new(192, 168, 5, 229), 22),
-            credentials,
-            config,
-        ));
-        let manager = Arc::new(SshConfigManager::new(shell.clone()));
-        Config::new(manager, shell).await.unwrap()
+        Config::from_credentials(Ipv4Addr::new(192, 168, 5, 229), "root", "opnsense").await
     }
 
     async fn get_static_mappings() -> Vec<StaticMap> {