is_maxdwin
sp->is_maxdwin, sp->is_dwinscale);
is->is_maxdwin = 1;
is->is_maxdwin = is->is_maxswin * 2;
is->is_maxdwin *= 2;
clone->is_maxdwin = ntohs(tcp->th_win);
if (clone->is_maxdwin == 0)
clone->is_maxdwin = 1;
clone->is_maxdwin = 1;
st->stu_data[1].td_maxwin = ips->is_maxdwin;
is->is_maxdwin = su.stu_data[1].td_maxwin;