[scripts] MATN-TC-02: Multicast listener registration and first use (#6409)

tests/scripts/thread-cert/node.py

@@ -2664,7 +2664,8 @@ class LinuxHost():
         cmd = f'python3 /app/third_party/openthread/repo/tests/scripts/thread-cert/mcast6.py {self.ETH_DEV} {ip} &'
         self.bash(cmd)
 
-    def ping_ether(self, ipaddr, num_responses=1, size=None, timeout=5, ttl=None) -> int:
+    def ping_ether(self, ipaddr, num_responses=1, size=None, timeout=5, ttl=None, interface=None) -> int:
+
         cmd = f'ping -6 {ipaddr} -I eth0 -c {num_responses} -W {timeout}'
         if size is not None:
             cmd += f' -s {size}'
@@ -2672,6 +2673,9 @@ class LinuxHost():
         if ttl is not None:
             cmd += f' -t {ttl}'
 
+        if interface is not None:
+            cmd += f' -I {interface}'
+
         resp_count = 0
 
         try: