|To:||Andre Hedrick <andre@xxxxxxxxxxxxx>|
|Subject:||Re: TOE brain dump|
|From:||Lincoln Dale <ltd@xxxxxxxxx>|
|Date:||Wed, 06 Aug 2003 18:20:06 +1000|
|Cc:||Jeff Garzik <jgarzik@xxxxxxxxx>, netdev@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Werner Almesberger <werner@xxxxxxxxxxxxxxx>, Nivedita Singhvi <niv@xxxxxxxxxx>|
At 05:12 PM 6/08/2003, Andre Hedrick wrote:
Do be sure to check that your data payload is correct. Everyone knows that a router/gateway/switch with a sticky bit in its memory will recompute the net crc16 checksum insure it pass the to the nic regardless. It is amazing how much data can be corrupted by a network environment via all the NFS/NBD/etc wantabie storage products out there.
firstly, do you REALLY think that most router(s)/switch(es) out there recompute IP checksums because they did a IP TTL decrement when routing an IP packet or NAT IP addresses?
no, they don't. just like netfilter or router-on-linux is smart enough to be able to re-code an IP checksum by unmasking and re-masking the old/new values in a header, so does the most router vendor's code.
secondly, why would a router or switch even be touching the data at layer-4 (TCP), let alone recalculating a CRC?
i know you really like your "we do ERL 2 in iSCSI" pitch, but lets stick to facts here eh?
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