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Date:      Thu, 20 Dec 2001 23:13:57 +0100
From:      Matthias Schuendehuette <msch@snafu.de>
To:        freebsd-stable@freebsd.org
Cc:        freebsd-hackers@freebsd.org
Subject:   isp-device broken in 4.5-PRERELEASE
Message-ID:  <E16HBRu-0006Wa-00@clever.eusc.inter.net>

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Hello,

something's broken with the isp-device (ISDN syncPPP network device).

The last working kernel was of dec 8, 2001. I found the problem after 
my next update at dec 15, 2001. Until today, the 'isdnd' worked with 
the old kernel of dec 8, but now the new userland doesn't fit anymore.

THANK GOD my old modem is still working! :-)

What I found out so far:

It seems nothing to do with the files in src/sys/i4b that changed 
between dec 8 and dec 15. I downloaded the files in question via CVSweb 
and built another kernel but the problems still remain.

After that, i played around with 'ping -n' and 'tcpdump -n' and found, 
that the sppp-part works fine (authentication succeeds), even the 
ICMP-packets are going forth and back (the dial-out process is 
triggered and i can see the packets in the tcpdump output) but 
obviously they never reach the ping process again.

'ping -n 194.64.64.23' reports:

PING 194.64.64.23 (194.64.64.23): 56 data bytes
^C
--- 194.64.64.23 ping statistics ---
6 packets transmitted, 0 packets received, 100% packet loss

but the 'tcpdump -n -i isp0' shows:

22:19:41.194471 IP 88: 213.73.67.35 > 194.64.64.23: icmp: echo request
22:19:41.258523 IP 88: 194.64.64.23 > 213.73.67.35: icmp: echo reply 
(DF)
22:19:41.258790 IP 88: 194.64.64.23 > 213.73.67.35: icmp: echo reply 
(DF)
22:19:42.202641 IP 88: 213.73.67.35 > 194.64.64.23: icmp: echo request
22:19:42.264898 IP 88: 194.64.64.23 > 213.73.67.35: icmp: echo reply 
(DF)
22:19:42.265110 IP 88: 194.64.64.23 > 213.73.67.35: icmp: echo reply 
(DF)
[...]

I already mailed with hm on that, but he has no ideas. I also don't 
believe that an error is in the i4b subsystem (see above). And I'm not 
the only one with these problems, in the german bsd-newsgroup are at 
least two other persons with exactly the same problems...

Please have a look on that issue. If I can do any further testing, I'll 
do it ASAP.

Ciao/BSD - Matthias

-- 
***************************************************************************
* Matthias Schuendehuette	msch@snafu.de	      	 		  *
* Solmsstrasse 44							  *
* D-10961 Berlin		Engineering Systems Support and Operation *
* Germany		      	(Powered by FreeBSD 4.4-STABLE)       	  *
***************************************************************************

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