Hi.

Packets in ppp_send_frame catched by pass_filter are only dropped if 
debuging is enabled:

                if (ppp->pass_filter.filter
                    && sk_run_filter(skb, ppp->pass_filter.filter,
                                     ppp->pass_filter.len) == 0) {
                        if (ppp->debug & 1) {
                                printk(KERN_DEBUG "PPP: outbound frame 
not passed\n");
                                kfree_skb(skb);
                                return;
                        }
                }



The problem is still present in 2.5 bitkeeper tree. Attached patch fixes it.
Regards,
Patrick