Differences in behavior between WRL6 and WRL8 with ping and size greater than MTU, when DF is set: Apparently when sending pings which are bigger than MTU size, not only the output are different WR6: Frag needed and DF set (mtu = 1500) WR8: "local error: Message too long, mtu=1500" It seem that the Linux counter behavior is different too. In WR6, IpFragFails counter is increase correctly. However, in WR8 nothing is increase.