On Thu, 2 Apr 2015, Hans Petter Selasky wrote:
Does somebody here know what happens in these two cases:
If we are transmitting using TSO, will the network adapter increment the
IP ID field somehow? What happens if an outgoing IP packet resulting from
a TSO packet get fragmented by a router?
Quite possibly -- this is presumably specified by the NIC vendor, but it
would be good to do a bit of a survey and see what happens in practice.
In ip_fragment() when we create fragments we should increment the ip_id
value for each fragment?
I'm asking because the code in FreeBSD, since the beginning probably, just
copies the IP header, and use the same IP ID for all the fragments ! This
just hit my mind after some recent work in this area.
I honestly cannot believe you are proposing that.
Please go read about how IP fragmentation works. Having an identical IP ID in
ip_fragment() is the point of the function!
Robert
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