is_maxdwin
ips.is_maxdwin, ips.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;