diff --git a/Cargo.toml b/Cargo.toml
index b8a6b5c..4cc519a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,7 @@ license = "MIT OR Apache-2.0"
 repository = "https://forgejo.fireturlte.net/lazy-supplements" 
 
 [workspace.dependencies]
+ciborium = "0.2.2"
 dioxus = { version = "0.6.0", features = [] }
 lazy-supplements-core.path = "lazy-supplements-core"
 libp2p = { version = "0.55.0", features = ["macros", "mdns", "noise", "ping", "tcp", "tokio", "yamux" ] }
@@ -17,3 +18,4 @@ sea-orm-migration = { version = "1.1.0", features = ["runtime-tokio-rustls", "sq
 serde = { version = "1.0.219", features = ["derive"] }
 thiserror = "2.0.12"
 tokio = { version = "1.45.0", features = ["macros", "rt", "rt-multi-thread"] }
+uuid = { version = "1.17.0", features = ["v7"] }
diff --git a/lazy-supplements-core/Cargo.toml b/lazy-supplements-core/Cargo.toml
index 2df7d38..05779a3 100644
--- a/lazy-supplements-core/Cargo.toml
+++ b/lazy-supplements-core/Cargo.toml
@@ -25,7 +25,7 @@ tokio.workspace = true
 toml = "0.8.22"
 tracing = "0.1.41"
 tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }
-uuid = { version = "1.17.0", features = ["v7"] }
+uuid.workspace = true
 
 [dev-dependencies]
 tempfile = "3.20.0"
diff --git a/lazy-supplements-core/src/cache/entity/mod.rs b/lazy-supplements-core/src/cache/entity/mod.rs
index e69de29..a091d9a 100644
--- a/lazy-supplements-core/src/cache/entity/mod.rs
+++ b/lazy-supplements-core/src/cache/entity/mod.rs
@@ -0,0 +1,14 @@
+mod multi_address;
+mod peer;
+
+pub use multi_address::{
+    ActiveModel as MultiAddressActiveModel,
+    Model as MultiAddressModel,
+    Entity as MultiAddressEntity,
+};
+
+pub use peer::{
+    ActiveModel as PeerActiveModel,
+    Model as PeerModel,
+    Entity as PeerEntity,
+};
\ No newline at end of file
diff --git a/lazy-supplements-core/src/cache/entity/multi_address.rs b/lazy-supplements-core/src/cache/entity/multi_address.rs
new file mode 100644
index 0000000..d4ac871
--- /dev/null
+++ b/lazy-supplements-core/src/cache/entity/multi_address.rs
@@ -0,0 +1,60 @@
+use chrono::Local;
+use sea_orm::entity::{
+    *,
+    prelude::*
+};
+use serde::{Deserialize, Serialize};
+
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "node")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: u32,
+    #[sea_orm(indexed)]
+    pub created_at: DateTimeUtc,
+    #[sea_orm(indexed)]
+    pub updated_at: DateTimeUtc,
+    #[sea_orm(indexed)]
+    pub synced_at: Option<DateTimeUtc>,
+    #[sea_orm(indexed)]
+    pub peer_id: String,
+    #[sea_orm(column_type = "Text")]
+    pub note: String,
+}
+
+#[derive(Copy, Clone, Debug, DeriveRelation, EnumIter)]
+pub enum Relation {}
+    
+impl ActiveModelBehavior for ActiveModel {}
+
+impl ActiveModel {
+    pub fn new() -> Self {
+        let timestamp: DateTimeUtc = Local::now().to_utc();
+        Self{
+            created_at: Set(timestamp),
+            updated_at: Set(timestamp),
+            ..Default::default()
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use libp2p::identity;
+    use crate::global::GLOBAL;
+
+     #[tokio::test]
+    async fn check_insert_node() {
+        let db = crate::global::get_or_init_temporary_main_database().await;
+        
+        ActiveModel{
+            peer_id: Set(identity::Keypair::generate_ed25519().public().to_peer_id().to_string()),
+            note: Set("test note".to_owned()),
+            ..ActiveModel::new()
+        }.insert(db).await.unwrap();
+    }
+
+}
\ No newline at end of file
diff --git a/lazy-supplements-core/src/cache/entity/peer.rs b/lazy-supplements-core/src/cache/entity/peer.rs
new file mode 100644
index 0000000..22ff686
--- /dev/null
+++ b/lazy-supplements-core/src/cache/entity/peer.rs
@@ -0,0 +1,55 @@
+use chrono::Local;
+use sea_orm::entity::{
+    *,
+    prelude::*
+};
+use serde::{Deserialize, Serialize};
+
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "node")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: u32,
+    #[sea_orm(indexed)]
+    pub created_at: DateTimeUtc,
+    #[sea_orm(indexed)]
+    pub updated_at: DateTimeUtc,
+    #[sea_orm(indexed)]
+    pub peer_id: String,
+}
+
+#[derive(Copy, Clone, Debug, DeriveRelation, EnumIter)]
+pub enum Relation {}
+    
+impl ActiveModelBehavior for ActiveModel {}
+
+impl ActiveModel {
+    pub fn new() -> Self {
+        let timestamp: DateTimeUtc = Local::now().to_utc();
+        Self{
+            created_at: Set(timestamp),
+            updated_at: Set(timestamp),
+            ..Default::default()
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use libp2p::identity;
+    use crate::global::GLOBAL;
+
+     #[tokio::test]
+    async fn check_insert_node() {
+        let db = crate::global::get_or_init_temporary_main_database().await;
+        
+        ActiveModel{
+            peer_id: Set(identity::Keypair::generate_ed25519().public().to_peer_id().to_string()),
+            ..ActiveModel::new()
+        }.insert(db).await.unwrap();
+    }
+
+}
\ No newline at end of file
diff --git a/lazy-supplements-core/src/data/entity/mod.rs b/lazy-supplements-core/src/data/entity/mod.rs
index 7c1d51b..5e38d96 100644
--- a/lazy-supplements-core/src/data/entity/mod.rs
+++ b/lazy-supplements-core/src/data/entity/mod.rs
@@ -14,8 +14,3 @@ pub use record_deletion::{
     Entity as RecordDeletionEntity,
     Model as RecordDeletionModel,
 };
-use uuid::{ContextV7, Timestamp, Uuid};
-
-pub fn generate_uuid() -> Uuid {
-    Uuid::new_v7(Timestamp::now(ContextV7::new()))
-}
\ No newline at end of file
diff --git a/lazy-supplements-core/src/data/entity/node.rs b/lazy-supplements-core/src/data/entity/node.rs
index 57c6253..34a20c8 100644
--- a/lazy-supplements-core/src/data/entity/node.rs
+++ b/lazy-supplements-core/src/data/entity/node.rs
@@ -32,7 +32,7 @@ impl ActiveModel {
     pub fn new() -> Self {
         let timestamp: DateTimeUtc = Local::now().to_utc();
         Self{
-            id: Set(super::generate_uuid()),
+            id: Set(crate::global::generate_uuid()),
             created_at: Set(timestamp),
             updated_at: Set(timestamp),
             ..Default::default()
diff --git a/lazy-supplements-core/src/data/entity/record_deletion.rs b/lazy-supplements-core/src/data/entity/record_deletion.rs
index f3c68c8..3454a49 100644
--- a/lazy-supplements-core/src/data/entity/record_deletion.rs
+++ b/lazy-supplements-core/src/data/entity/record_deletion.rs
@@ -26,7 +26,7 @@ impl ActiveModel {
     pub fn new() -> Self {
         let timestamp: DateTimeUtc = Local::now().to_utc();
         Self{
-            id: Set(super::generate_uuid()),
+            id: Set(crate::global::generate_uuid()),
             created_at: Set(timestamp),
             ..Default::default()
         }
@@ -46,7 +46,7 @@ mod tests {
         
         assert!(ActiveModel{
             table_name: Set("test_table".to_string()),
-            record_id: Set(super::super::generate_uuid()),
+            record_id: Set(crate::global::generate_uuid()),
             ..ActiveModel::new()
         }.insert(db).await.is_ok());
     }
diff --git a/lazy-supplements-core/src/global/mod.rs b/lazy-supplements-core/src/global/mod.rs
index 58092ce..7a470d1 100644
--- a/lazy-supplements-core/src/global/mod.rs
+++ b/lazy-supplements-core/src/global/mod.rs
@@ -9,6 +9,11 @@ use tokio::sync::{OnceCell, RwLock};
 
 mod database;
 use database::GlobalDatabase;
+use uuid::{ContextV7, Timestamp, Uuid};
+
+pub fn generate_uuid() -> Uuid {
+    Uuid::new_v7(Timestamp::now(ContextV7::new()))
+}
 
 pub static PRODUCT_NAME: LazyLock<String> = LazyLock::new(|| {
     env!("CARGO_PKG_NAME").to_string()
diff --git a/lazy-supplements-core/src/ipc.rs b/lazy-supplements-core/src/ipc.rs
new file mode 100644
index 0000000..63a8d5f
--- /dev/null
+++ b/lazy-supplements-core/src/ipc.rs
@@ -0,0 +1,4 @@
+pub trait Message {
+    fn into_vec_u8(self) -> Vec<u8>;
+    fn from_vec_u8() -> Self;
+}
\ No newline at end of file
diff --git a/lazy-supplements-core/src/lib.rs b/lazy-supplements-core/src/lib.rs
index da2bd3c..14f26b1 100644
--- a/lazy-supplements-core/src/lib.rs
+++ b/lazy-supplements-core/src/lib.rs
@@ -3,6 +3,7 @@ pub mod config;
 pub mod data;
 pub mod error;
 pub mod global;
+pub mod ipc;
 pub mod migration;
 pub mod p2p;
 #[cfg(any(test, feature="test"))]
diff --git a/lazy-supplements-desktop/Cargo.toml b/lazy-supplements-desktop/Cargo.toml
index 69842f4..ddaafc4 100644
--- a/lazy-supplements-desktop/Cargo.toml
+++ b/lazy-supplements-desktop/Cargo.toml
@@ -11,6 +11,7 @@ default = []
 test = ["lazy-supplements-core/test"]
 
 [dependencies]
+ciborium.workspace = true
 clap = { version = "4.5.38", features = ["derive"] }
 dirs = "6.0.0"
 lazy-supplements-core.workspace = true
@@ -18,6 +19,7 @@ libp2p.workspace = true
 serde.workspace = true
 thiserror.workspace = true
 tokio.workspace = true
+uuid.workspace = true
 
 [dev-dependencies]
-lazy-supplements-core = {workspace = true, features = ["test"]}
\ No newline at end of file
+lazy-supplements-core = {workspace = true, features = ["test"]}
diff --git a/lazy-supplements-desktop/src/ipc/client/mod.rs b/lazy-supplements-desktop/src/ipc/client/mod.rs
new file mode 100644
index 0000000..b465044
--- /dev/null
+++ b/lazy-supplements-desktop/src/ipc/client/mod.rs
@@ -0,0 +1,11 @@
+#[cfg(unix)]
+pub mod unix;
+
+#[cfg(windows)]
+pub mod windows;
+
+#[cfg(unix)]
+pub use unix::*;
+
+#[cfg(windows)]
+pub use windows::*;
\ No newline at end of file
diff --git a/lazy-supplements-desktop/src/ipc/client/unix.rs b/lazy-supplements-desktop/src/ipc/client/unix.rs
new file mode 100644
index 0000000..e69de29
diff --git a/lazy-supplements-desktop/src/ipc/client/windows.rs b/lazy-supplements-desktop/src/ipc/client/windows.rs
new file mode 100644
index 0000000..e69de29
diff --git a/lazy-supplements-desktop/src/ipc/message/mod.rs b/lazy-supplements-desktop/src/ipc/message/mod.rs
new file mode 100644
index 0000000..56ee0d9
--- /dev/null
+++ b/lazy-supplements-desktop/src/ipc/message/mod.rs
@@ -0,0 +1,4 @@
+mod response;
+mod request;
+pub use response::*;
+pub use request::*;
\ No newline at end of file
diff --git a/lazy-supplements-desktop/src/ipc/message/request.rs b/lazy-supplements-desktop/src/ipc/message/request.rs
new file mode 100644
index 0000000..2abf41d
--- /dev/null
+++ b/lazy-supplements-desktop/src/ipc/message/request.rs
@@ -0,0 +1,24 @@
+use lazy_supplements_core::global::generate_uuid;
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct Request {
+    pub id: Uuid,
+    pub content: RequestContent,
+}
+
+impl From<RequestContent> for Request {
+    fn from(c: RequestContent) -> Self {
+        Self{
+            id: generate_uuid(),
+            content: c
+        }
+    }
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+pub enum RequestContent {
+    Ping,
+    ListPeers,
+}
\ No newline at end of file
diff --git a/lazy-supplements-desktop/src/ipc/message/response.rs b/lazy-supplements-desktop/src/ipc/message/response.rs
new file mode 100644
index 0000000..d9caa9d
--- /dev/null
+++ b/lazy-supplements-desktop/src/ipc/message/response.rs
@@ -0,0 +1,27 @@
+use lazy_supplements_core::{
+    global::generate_uuid,
+    cache::entity::PeerModel,
+};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct Response {
+    pub id: Uuid,
+    pub content: ResponseContent,
+}
+
+impl From<ResponseContent> for Response {
+    fn from(c: ResponseContent) -> Self {
+        Self{
+            id: generate_uuid(),
+            content: c
+        }
+    }
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+pub enum ResponseContent {
+    Pong,
+    ListPeers(Vec<PeerModel>)
+}
\ No newline at end of file
diff --git a/lazy-supplements-desktop/src/ipc/mod.rs b/lazy-supplements-desktop/src/ipc/mod.rs
new file mode 100644
index 0000000..6d19b4f
--- /dev/null
+++ b/lazy-supplements-desktop/src/ipc/mod.rs
@@ -0,0 +1,3 @@
+pub mod client;
+pub mod server;
+pub mod message;
\ No newline at end of file
diff --git a/lazy-supplements-desktop/src/ipc/server/mod.rs b/lazy-supplements-desktop/src/ipc/server/mod.rs
new file mode 100644
index 0000000..b465044
--- /dev/null
+++ b/lazy-supplements-desktop/src/ipc/server/mod.rs
@@ -0,0 +1,11 @@
+#[cfg(unix)]
+pub mod unix;
+
+#[cfg(windows)]
+pub mod windows;
+
+#[cfg(unix)]
+pub use unix::*;
+
+#[cfg(windows)]
+pub use windows::*;
\ No newline at end of file
diff --git a/lazy-supplements-desktop/src/ipc/server/unix.rs b/lazy-supplements-desktop/src/ipc/server/unix.rs
new file mode 100644
index 0000000..dd6d844
--- /dev/null
+++ b/lazy-supplements-desktop/src/ipc/server/unix.rs
@@ -0,0 +1,69 @@
+use std::{collections::VecDeque, path::Path, sync::Arc};
+
+use lazy_supplements_core::error::Error;
+use tokio::{io::Interest, net::UnixStream, sync::Mutex};
+
+use crate::ipc::message::{RequestContent, Response, ResponseContent};
+
+pub async fn listen<T>(path: T) -> Result<(), Error>
+where T: AsRef<Path> {
+    let stream = UnixStream::connect(path).await?;
+    let write_que: Arc<Mutex<VecDeque<Vec<u8>>>> = Arc::new(Mutex::new(VecDeque::new()));
+    let mut write_next: Option<Vec<u8>> = None;
+    loop {
+        let ready = stream.ready(Interest::READABLE).await?;
+        if ready.is_readable() {
+            let mut data = Vec::new();
+            match stream.try_read(&mut data) {
+                Ok(x) => {
+                    println!("read {} bytes", x)
+                }
+                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
+                    continue;
+                }
+                Err(e) => {
+                    return Err(e.into())
+                }
+            }
+            let write_que2 = write_que.clone();
+            tokio::spawn( async move {
+                let mut buf = Vec::new();
+                let request: crate::ipc::message::Request = ciborium::from_reader_with_buffer(data.as_slice(), &mut buf).unwrap();
+                let response_id = request.id;
+                let response_content: ResponseContent = match request.content {
+                    RequestContent::Ping => {
+                        ResponseContent::Pong
+                    }
+                    RequestContent::ListPeers => todo!(),
+                };
+                let mut response_buf = Vec::new();
+                if let Err(e) = ciborium::into_writer(&Response{
+                    id: response_id,
+                    content: response_content,
+                }, &mut response_buf) {
+                    todo!();
+                };
+                let mut que = write_que2.lock().await;
+                que.push_back(response_buf);
+
+            });
+        } else if ready.is_writable()  {
+            if let Some(x) = write_next.take() {
+
+                match stream.try_write(&x) {
+                    Ok(x) => {
+                        println!("write {} bytes", x)
+                    }
+                    Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
+                        continue;
+                    }
+                    Err(e) => {
+                        return Err(e.into())
+                    }
+                }
+            }
+        }
+        let mut locked_que = write_que.lock().await;
+        write_next = locked_que.pop_front();
+    }
+}
diff --git a/lazy-supplements-desktop/src/ipc/server/windows.rs b/lazy-supplements-desktop/src/ipc/server/windows.rs
new file mode 100644
index 0000000..e69de29
diff --git a/lazy-supplements-desktop/src/lib.rs b/lazy-supplements-desktop/src/lib.rs
index b9a67d6..1b0e39c 100644
--- a/lazy-supplements-desktop/src/lib.rs
+++ b/lazy-supplements-desktop/src/lib.rs
@@ -1,8 +1,9 @@
 pub mod cli;
 pub mod error;
 pub mod global;
+pub mod ipc;
 pub use lazy_supplements_core::{
     cache,
     config,
     data,
-};
\ No newline at end of file
+};