Filter interfaces that are up (#52)

m-lab · Jun 30, 2023 · 240575e · 240575e
1 parent 4d21ab4
commit 240575e
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/main.go b/main.go
@@ -94,7 +94,10 @@ func processFlags() ([]net.Interface, error) {
 		if err != nil {
 			return ifaces, err
 		}
-		ifaces = append(ifaces, *i)
+		if i.Flags&net.FlagUp != 0 {
+			// We can only capture packets from interfaces that are up.
+			ifaces = append(ifaces, *i)
+		}
 	}
 	return ifaces, nil
 }