1 files changed, 7 insertions, 4 deletions
diff --git a/host/lib/transport/udp_zero_copy_asio.cpp b/host/lib/transport/udp_zero_copy_asio.cpp
index 13fd50f65..3e0e80bd8 100644
--- a/host/lib/transport/udp_zero_copy_asio.cpp
+++ b/host/lib/transport/udp_zero_copy_asio.cpp
@@ -110,6 +110,9 @@ private:
 
     size_t get_recv_buff_size(void);
     void set_recv_buff_size(size_t);
+
+    static const size_t _mtu = 1500; //FIXME we have no idea
+    static const size_t _hdrs = (2 + 14 + 20 + 8); //size of headers (pad, eth, ip, udp)
 };
 
 udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::string &port){
@@ -143,7 +146,7 @@ udp_zero_copy_impl::~udp_zero_copy_impl(void){
 }
 
 managed_recv_buffer::sptr udp_zero_copy_impl::get_recv_buff(void){
-    boost::uint32_t *buff_mem = new boost::uint32_t[1500/sizeof(boost::uint32_t)];
+    boost::uint32_t *buff_mem = new boost::uint32_t[_mtu/sizeof(boost::uint32_t)];
 
     //implement timeout through polling and sleeping
     size_t available = 0;
@@ -155,7 +158,7 @@ managed_recv_buffer::sptr udp_zero_copy_impl::get_recv_buff(void){
 
     //receive only if data is available
     if (available){
-        available = _socket->receive(boost::asio::buffer(buff_mem, available));
+        available = _socket->receive(boost::asio::buffer(buff_mem, _mtu));
     }
 
     //create a new managed buffer to house the data
@@ -165,9 +168,9 @@ managed_recv_buffer::sptr udp_zero_copy_impl::get_recv_buff(void){
 }
 
 managed_send_buffer::sptr udp_zero_copy_impl::get_send_buff(void){
-    boost::uint32_t *buff_mem = new boost::uint32_t[1500/sizeof(boost::uint32_t)];
+    boost::uint32_t *buff_mem = new boost::uint32_t[_mtu/sizeof(boost::uint32_t)];
     return managed_send_buffer::sptr(
-        new managed_send_buffer_impl(boost::asio::buffer(buff_mem, 1500), _socket)
+        new managed_send_buffer_impl(boost::asio::buffer(buff_mem, _mtu-_hdrs), _socket)
     );
 }