Modem & PPP Troubles
Hans-Peter Huth
Hello,
I have a problem connecting two machines over PPP over ISDN. Maybe someone
can help, it's really going on my nerves :-(
OK, here's what i did: I have one machine with Win95 acting as a fileserver
(M1, see pic) attached to the ISDN. Another machine (M2) acts as a router from
ISDN to a LAN. A third machine i located in the LAN and tries to connect
to M1 to access the file system of M1.
(M1)--modem-- ISDN --modem--(M2)-- LAN --M3
The route over the ISDN is a TCP/IP over ML-PPP. The modems are Zyxel Omni.net
(external). M1 is a notebook with Win95, M2 is a PC with FreeBSD 2.2.1, M3
again is a notebook with Win95.
At the moment the scenario does work more or less. If M3 opens a file on M1,
the router M2 will build a PPP-connection to M1 and the data can flow.
However, i've two problems:
- the connection is very slow, about avg 2 KB over one or two (!) ISDN
B-channels. Round-trip delays (ping) are about avg 170 ms which seems
to be to long for 64 bytes.
- terminating a connection from the router seem to cause a correct hangup,
but the next attempt to connect again fails (Cause: Busy). After some
10-20 sec a new connect succeeds.
I have tested the modems, the cables, looked propably a doozend times into
the FreeBSD config-files and the Win95 properties. I've played around with
AT-commands, HW/SW-Handshake, but no matter what i did, performance always
was far to low.
If you have any hints, please tell me. I don't even now if the problem is
the Win95 or the FreeBSD, HW or SW. Attached are parts of my ppp-setups and
the ppp-log file from the router.
Thanks,
H.-P.
(Apologies if you received this twice, i had some problems with my news
reader )
+-----------------------------------------------------------------------+
| Hans-Peter Huth Phone: +49 89 636 430 71 |
| Siemens AG, Dept. ZT IK 2 FAX: +49 89 636 480 00 |
| Otto-Hahn-Ring 6 E-mail: Hans-Pe...@mchp.siemens.de|
|D-81730 Munich |
+-----------------------------------------------------------------------+
IP or not IP - OSI is the question <]:-)
-------------------------- cut here 8< ----------------------------------
# from /etc/sysconfig
# <stuff deleted>
#
network_interfaces="ep0 lo0 tun0"
#network_interfaces="vx0 lo0"
ifconfig_ep0="inet 172.16.1.20 netmask 255.255.255.0"
#ifconfig_vx0="inet 172.16.1.20 netmask 255.255.255.0"
ifconfig_lo0="inet 127.0.0.1"
ifconfig_tun0="inet 172.16.2.20 172.16.2.21/23 netmask 255.255.255.0"
#ifconfig_ppp0="inet 172.16.2.20 netmask 255.255.255.0"
# <stuff deleted>
#
-----------------------------------
/etc/ppp/ppp.conf
default:
set device /dev/cuaa0
set speed 115200
# set speed 57600
set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" ATE1Q0 OK-AT-OK \\dATD\\T TIMEOUT 40 CONNECT"
# set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" ATE0Q0CE1&J3&K00 OK-AT-OK \\dATD\\T TIMEOUT 40 CONNECT"
# enable proxy
disable lqr
deny lqr
set timeout 120
set debug Phase Chat LQM LCP Link
enable msext
set ns 172.16.1.20
set nbns 172.16.1.20
provider:
set phone 67920254
# set phone 67920250
set ifaddr 172.16.2.20 172.16.2.21
delete ALL
add 0 0 172.16.2.20
set openmode active
----------------------------------
# ppplog.txt from M1 (parts)
08-13-1997 10:51:44.23 - Remote access driver log opened.
08-13-1997 10:51:44.23 - Installable CP VxD SPAP is loaded
08-13-1997 10:51:44.23 - Server type is PPP (Point to Point Protocol).
08-13-1997 10:51:44.23 - FSA : Software compression disabled.
08-13-1997 10:51:44.23 - FSA : Protocol not bound - skipping control protocol 803f (NBFCP).
08-13-1997 10:51:44.23 - FSA : Adding Control Protocol 8021 (IPCP) to control protocol chain.
08-13-1997 10:51:44.23 - FSA : Protocol not bound - skipping control protocol 802b (IPXCP).
08-13-1997 10:51:44.23 - FSA : Adding Control Protocol c027 (no description) to control protocol chain.
08-13-1997 10:51:44.23 - FSA : Adding Control Protocol c023 (PAP) to control protocol chain.
08-13-1997 10:51:44.23 - FSA : Adding Control Protocol c223 (CHAP) to control protocol chain.
08-13-1997 10:51:44.23 - FSA : Adding Control Protocol c021 (LCP) to control protocol chain.
08-13-1997 10:51:44.23 - LCP : Layer started.
08-13-1997 10:51:44.42 - LCP : Received and accepted address+control field compression option.
08-13-1997 10:51:44.43 - LCP : Received and accepted protocol field compression option.
08-13-1997 10:51:44.43 - LCP : Received and accepted ACCM of 0.
08-13-1997 10:51:44.43 - LCP : Received and accepted MRU of 1500.
08-13-1997 10:51:44.43 - LCP : Received and accepted magic number 6d09a38.
08-13-1997 10:51:44.43 - LCP : Peer requests authentication protocol c023 (CHAP).
08-13-1997 10:51:44.43 - LCP : Trying authentication protocol c023 (PAP).
08-13-1997 10:51:44.63 - LCP : Layer up.
08-13-1997 10:51:44.63 - PAP : Layer started.
08-13-1997 10:51:44.63 - PAP : Layer up.
08-13-1997 10:51:44.63 - IPCP : Layer started.
08-13-1997 10:51:44.63 - IPCP : IP address is 0.
08-13-1997 10:51:44.79 - IPCP : Received and accepted IP address of ac100214.
08-13-1997 10:51:44.79 - IPCP : Received and accepted compression protocol request f 0.
08-13-1997 10:51:44.79 - FSA : Sending protocol reject for control protocol 80fd.
08-13-1997 10:51:44.79 - IPCP : Changing IP address from 0 to ac100215.
08-13-1997 10:51:45.02 - IPCP : Layer up.
08-13-1997 10:51:45.02 - FSA : Last control protocol is up.
08-13-1997 10:58:05.88 - LCP : Received terminate request.
08-13-1997 10:58:05.88 - LCP : Layer down.
08-13-1997 10:58:05.88 - PAP : Layer down.
08-13-1997 10:58:05.88 - IPCP : Layer down.
08-13-1997 10:58:06.32 - Remote access driver is shutting down.
08-13-1997 10:58:06.32 - CRC Errors 0
08-13-1997 10:58:06.32 - Timeout Errors 0
08-13-1997 10:58:06.32 - Alignment Errors 0
08-13-1997 10:58:06.32 - Overrun Errors 0
08-13-1997 10:58:06.32 - Framing Errors 0
08-13-1997 10:58:06.32 - Buffer Overrun Errors 0
08-13-1997 10:58:06.32 - Incomplete Packets 0
08-13-1997 10:58:06.32 - Bytes Received 2562
08-13-1997 10:58:06.32 - Bytes Transmittted 4380
08-13-1997 10:58:06.32 - Frames Received 46
08-13-1997 10:58:06.32 - Frames Transmitted 46
08-13-1997 10:58:06.32 - Remote access driver log closed.