On Tue, Jul 28, 2015 at 12:53:26AM +0200, Phil Sutter wrote:
> Upon receipt of SYNACK from the server, ipt_SYNPROXY first sends back an ACK 
> to
> finish the server handshake, then calls nf_ct_seqadj_init() to initiate
> sequence number adjustment of forwarded packets to the client and finally 
> sends
> a window update to the client to unblock it's TX queue.
> 
> Since synproxy_send_client_ack() does not set synproxy_send_tcp()'s nfct
> parameter, no sequence number adjustment happens and the client receives the
> window update with incorrect sequence number. Depending on client TCP
> implementation, this leads to a significant delay (until a window probe is
> being sent).

Could you also fix the IPv6 side to get both codes in sync? Thanks.

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