Userspace packet queuing with libipq: ip_conntrack does not defragment?

[Jan Engelhardt]

On May 9 2007 18:34, Martijn Lievaart wrote:
> Michael Ransburg wrote:
>> However, since ip_conntrack is loaded I would expect that
>> the packets are defragmented before they are passed to my userspace
>> appliation (as indicated here for example:
>> http://lists.netfilter.org/pipermail/netfilter/2002-May/034006.html).
>> This does not seem the case, i.e., the maximum size of the packets
>> which I get (through ->data_len) is 1500 bits.
>> 
>> The len parameter of the ipq_read method is well over 1500, as is the
>> buffer size.
>
> Do you actually have packets greater than 1500 bytes? That would mean you send
> over loopback, tokenring, etc, but NOT ethernet.

Gigabit ethernet allows for 9000-byte jumbo frames.

> Maybe you are confusing datagram and packet fragmentation. Conntrack only
> defragments packets, not datagrams.


	Jan
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