nfqueue: nfq_set_verdict(...., len), where len > MTU?

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Hi all.
I am trying to modify & send out a packet larger than MTU, using
nfq_set_verdict(...., new_payload, len).
len = 200, unsigned char[2000] new_payload is stripped of any null
bytes after TCP header, IP total len (network short) set to 5000.

However, the receiving host keeps getting only 548 bytes, as logged by tcpdump.

So, does NFQUEUE has nothing to do with IP fragmentation even when
listening at mangle table's PREROUTING?
Will be there any positive effect, if I change IP options to DF (dont fragment)?

--
cheers,
Igor
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