an linux server behind cisco pix 525 want to connect to a Freebsd server behind NetBSD packet filter.
the client send syn packet with mss 1460 , it through pix 525 and pix525 change mss to 1380
the FreeBSD server receive syn and syn back with mss 1460
the client received syn and retun ack, but the ack packet can't throuth pix 525, then connect lose.
does anyone know why?