integration-test: Try using ip commands

Author: kevinji

test/integration-test/src/utils.rs

@@ -4,7 +4,7 @@ use std::{
     ffi::CStr,
     io,
     net::Ipv4Addr,
-    process,
+    process::{self, Command},
     sync::atomic::{AtomicU64, Ordering},
 };
 
@@ -67,7 +67,35 @@ impl NetNsGuard {
         unsafe { netlink_set_link_up(lo_idx as i32) }
             .unwrap_or_else(|e| panic!("Failed to set `lo` up in netns {}: {e}", name));
 
-        setup_test_veth_pair();
+        //setup_test_veth_pair();
+        Command::new("ip")
+            .args(&[
+                "link",
+                "add",
+                "dev",
+                IF_NAME_1.to_str().unwrap(),
+                "type",
+                "veth",
+                "peer",
+                "name",
+                IF_NAME_2.to_str().unwrap(),
+            ])
+            .status()
+            .unwrap_or_else(|e| {
+                panic!(
+                    "Failed to set up veth pair ({}, {}): {e}",
+                    IF_NAME_1.to_string_lossy(),
+                    IF_NAME_2.to_string_lossy()
+                )
+            })
+            .exit_ok()
+            .unwrap_or_else(|e| {
+                panic!(
+                    "Failed to set up veth pair ({}, {}): {e}",
+                    IF_NAME_1.to_string_lossy(),
+                    IF_NAME_2.to_string_lossy()
+                )
+            });
 
         let if_idx1 = unsafe { if_nametoindex(IF_NAME_1.as_ptr()) };
         if if_idx1 == 0 {