On Wed, Dec 16, 2015 at 4:00 PM, Saku Ytti <saku@xxxxxxx> wrote: > On 16 December 2015 at 14:26, Alexey Eromenko <al4321@xxxxxxxxx> wrote: > >> But if so, making a stronger layer 4 checksum can also solve this problem. >> i.e. TCP with CRC32 or CRC64, instead of loosy 16-bit checksum. >> >> It will solve the "core router" and the "important Ethernet switch" >> mangling problem. > > How? Core router wouldn't verify L4. Or is the proposal it should? So when > we introduce new L4, we need to update all L3 devices? Sounds like an > expensive layer violation. It should not. I say, that if TCP had a powerful checksum (like CRC32 or above), Mangling problem would not occur at the Core Router level. -- -Alexey Eromenko "Technologov"