I am very very sorry: till now, I am able to test your modify.

1)
I don't know how to apply the file `patch-ah` you provided.
I try to add patch-ah into distinfo, but I am afraid of checksum 
calculating.

for example, to verify it, i test it on patch-aa
serv01: [water] {46} sha1 patch-aa
SHA1 (patch-aa) = 65d518f2eeede695ec2827f1a55d6cbbb87bd8ae

but in distinfo:
SHA1 (patch-aa) = 3f806e96d3c89d9d0850d6692fd8b14778bc46c4

what's wrong?

2)
So, when make is done, I apply your patch-ah line by line manually,
re-compile ppp.o, re-link pppoe and copy it to /usr/pkg/sbin/

below is /var/log/messages:

Sep  1 17:55:38 au1550 pppd[28940]: Using interface ppp0
Sep  1 17:55:38 au1550 pppd[28940]: Connect: ppp0 <--> /dev/ttyp1
Sep  1 17:55:38 au1550 pppoe[24931]: Interface=aumac1 
HWaddr=00:00:1A:19:1C:26 D
evice=/dev/bpf0 Buffer size=32768
Sep  1 17:56:09 au1550 pppd[28940]: LCP: timeout sending Config-Requests
Sep  1 17:56:09 au1550 pppd[28940]: Connection terminated.
Sep  1 17:56:09 au1550 pppd[28940]: read: Bad file descriptor
Sep  1 17:56:09 au1550 pppd[28940]: Exit.
Sep  1 17:56:09 au1550 pppoe-server[23339]: Session 3 closed for client 
00:00:f0
:7e:d3:24 (192.168.13.12) on aumac1
Sep  1 17:56:09 au1550 pppoe[23916]: Unexpected packet code 167
Sep  1 17:56:09 au1550 pppoe-server[23339]: Sent PADT

----- Original Message ----- 
From: "Martin Husemann" <martin@duskware.de>
To: <martin@NetBSD.org>; <gnats-admin@NetBSD.org>; <pkgsrc-bugs@NetBSD.org>; 
<water@infor-trans.com>
Sent: Saturday, August 05, 2006 10:15 PM
Subject: Re: pkg/33926 (rp-pppoe report asyncReadFromPPP error on 
NetBSD-3.0)


> The following reply was made to PR pkg/33926; it has been noted by GNATS.
>
> From: Martin Husemann <martin@duskware.de>
> To: gnats-bugs@NetBSD.org
> Cc:
> Subject: Re: pkg/33926 (rp-pppoe report asyncReadFromPPP error on 
> NetBSD-3.0)
> Date: Sat, 5 Aug 2006 16:12:43 +0200
>
> --RASg3xLB4tUQ4RcS
> Content-Type: text/plain; charset=us-ascii
> Content-Disposition: inline
>
> The package seems broken in multiple ways. The patches patch-ac and
> patch-ad (both noops and unecessary) should be removed.
>
> The patch below fixes the obvious EINVAL problem reported in this PR, but
> it does not make the package work - to me it seems after restructuring
> rp-pppoe completely there has been no testing on OSes using BPF.
>
> If noone volunteers to debug the package all way through we should either
> mark it broken or consider downgrading it.
>
> Martin
>
> --RASg3xLB4tUQ4RcS
> Content-Type: text/plain; charset=us-ascii
> Content-Disposition: attachment; filename=patch-ah
>
> --- src/ppp.c.orig 2002-07-08 16:38:24.000000000 +0200
> +++ src/ppp.c 2006-08-05 15:49:46.000000000 +0200
> @@ -164,13 +164,27 @@
>  void
>  asyncReadFromPPP(PPPoEConnection *conn, PPPoEPacket *packet)
>  {
> -    unsigned char buf[READ_CHUNK];
> -    unsigned char *ptr = buf;
> +    unsigned char *ptr;
>      unsigned char c;
> +    extern int bpfLength;
> +    static int readLength = 0;
> +    unsigned char *buf = NULL;
>
>      int r;
>
> -    r = read(0, buf, READ_CHUNK);
> +    if (readLength == 0) {
> + /*
> + * We need to read everything from BPF in the size the kernel
> + * told us (bpfLength), if we are using BPF.
> + * Otherwise just use READ_CHUNK.
> + */
> + if (bpfLength == 0)
> +     readLength = READ_CHUNK;
> + else
> +     readLength = bpfLength;
> +    }
> +    ptr = buf = malloc(readLength);
> +    r = read(0, buf, readLength);
>      if (r < 0) {
>  fatalSys("read (asyncReadFromPPP)");
>      }
> @@ -193,7 +207,7 @@
>  }
>
>  /* Still waiting... */
> - if (PPPState == STATE_WAITFOR_FRAME_ADDR) return;
> + if (PPPState == STATE_WAITFOR_FRAME_ADDR) goto done;
>
>  while(r && PPPState == STATE_DROP_PROTO) {
>      --r;
> @@ -202,7 +216,7 @@
>      }
>  }
>
> - if (PPPState == STATE_DROP_PROTO) return;
> + if (PPPState == STATE_DROP_PROTO) goto done;
>
>  /* Start building frame */
>  while(r && PPPState == STATE_BUILDING_PACKET) {
> @@ -234,6 +248,8 @@
>      }
>  }
>      }
> +done:
> +    free(buf);
>  }
>
>  /**********************************************************************
>
> --RASg3xLB4tUQ4RcS--
>
>