diff --git a/src/dot3.cpp b/src/dot3.cpp
index 3315f51..0a71451 100644
--- a/src/dot3.cpp
+++ b/src/dot3.cpp
@@ -118,9 +118,11 @@ void Dot3::send(PacketSender &sender) {
 bool Dot3::matches_response(uint8_t *ptr, uint32_t total_sz) {
     if(total_sz < sizeof(ethhdr))
         return false;
-    ethhdr *eth_ptr = (ethhdr*)ptr;
+    const ethhdr *eth_ptr = (const ethhdr*)ptr;
     if(!memcmp(eth_ptr->dst_mac, _eth.src_mac, sizeof(_eth.src_mac))) {
-        return true;
+        ptr += sizeof(ethhdr);
+        total_sz -= sizeof(ethhdr);
+        return inner_pdu() ? inner_pdu()->matches_response(ptr, total_sz) : true;
     }
     return false;
 }
diff --git a/src/ethernetII.cpp b/src/ethernetII.cpp
index 6d879dc..c422e75 100644
--- a/src/ethernetII.cpp
+++ b/src/ethernetII.cpp
@@ -130,7 +130,7 @@ void EthernetII::send(PacketSender &sender) {
 bool EthernetII::matches_response(uint8_t *ptr, uint32_t total_sz) {
     if(total_sz < sizeof(ethhdr))
         return false;
-    ethhdr *eth_ptr = (ethhdr*)ptr;
+    const ethhdr *eth_ptr = (const ethhdr*)ptr;
     if(!memcmp(eth_ptr->dst_mac, _eth.src_mac, address_type::address_size)) {
         // chequear broadcast en destino original...
         return (inner_pdu()) ? inner_pdu()->matches_response(ptr + sizeof(_eth), total_sz - sizeof(_eth)) : true;