diff --git a/common/src/args_parse.rs b/common/src/args_parse.rs
index 6155cea..81af384 100644
--- a/common/src/args_parse.rs
+++ b/common/src/args_parse.rs
@@ -1,6 +1,6 @@
 use std::net::Ipv4Addr;
 
-pub fn ips_parse(ips: &Vec<String>) -> Result<Vec<(u32, u32, Ipv4Addr)>, String> {
+pub fn ips_parse(ips: &Vec<String>,in_ip:bool) -> Result<Vec<(u32, u32, Ipv4Addr)>, String> {
     let mut in_ips_c = vec![];
     for x in ips {
         let mut split = x.split(",");
@@ -12,7 +12,10 @@ pub fn ips_parse(ips: &Vec<String>) -> Result<Vec<(u32, u32, Ipv4Addr)>, String>
         let ip = if let Some(ip) = split.next() {
             ip
         } else {
-            return Err("ipv4/mask,ipv4".to_string());
+            if in_ip{
+                return Err("ipv4/mask,ipv4".to_string());
+            }
+            "0.0.0.0"
         };
         let ip = if let Ok(ip) = ip.parse::<Ipv4Addr>() {
             ip
diff --git a/vnt-cli/README.md b/vnt-cli/README.md
index e8c75ed..bcaa416 100644
--- a/vnt-cli/README.md
+++ b/vnt-cli/README.md
@@ -23,6 +23,8 @@
 
 在B配置 **-o 192.168.0.0/24,192.168.0.10**  ,表示允许将192.168.0.0/24的数据从网卡192.168.0.10转发出去
 
+注：-o 可以不配置出口ip,如直接使用 **-o 192.168.0.0/24** ,  这将使用默认ip转发
+
 ### -w `<password>`
 
 提升通信安全性，使用该密码生成的密钥对客户端数据进行加密，并且服务端无法解密。使用相同密码的客户端才能通信
diff --git a/vnt-cli/src/main.rs b/vnt-cli/src/main.rs
index ba046e0..20ed551 100644
--- a/vnt-cli/src/main.rs
+++ b/vnt-cli/src/main.rs
@@ -140,7 +140,7 @@ async fn main0() {
         .collect::<Vec<_>>();
 
     let in_ip = matches.opt_strs("i");
-    let in_ip = match ips_parse(&in_ip) {
+    let in_ip = match ips_parse(&in_ip, true) {
         Ok(in_ip) => { in_ip }
         Err(e) => {
             print_usage(&program, opts);
@@ -150,7 +150,7 @@ async fn main0() {
         }
     };
     let out_ip = matches.opt_strs("o");
-    let out_ip = match ips_parse(&out_ip) {
+    let out_ip = match ips_parse(&out_ip, false) {
         Ok(out_ip) => { out_ip }
         Err(e) => {
             print_usage(&program, opts);
diff --git a/vnt/src/core/mod.rs b/vnt/src/core/mod.rs
index d789be7..1936891 100644
--- a/vnt/src/core/mod.rs
+++ b/vnt/src/core/mod.rs
@@ -184,7 +184,10 @@ impl VntUtil {
         // NAT检测
         let nat_test = NatTest::new(config.nat_test_server.clone(), response.public_ip, response.public_port, local_ip, local_port);
 
-        let out_ips = config.out_ips.iter().map(|(_, _, ip)| *ip).collect::<HashSet<Ipv4Addr>>();
+        let mut out_ips = config.out_ips.iter().map(|(_, _, ip)| *ip).collect::<HashSet<Ipv4Addr>>();
+        if out_ips.remove(&Ipv4Addr::UNSPECIFIED) {
+            out_ips.insert(local_ip);
+        }
         let out_external_route = ExternalRoute::new(config.out_ips);
         let in_external_route = if config.in_ips.is_empty() {
             None