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Article #981

Strange problems with ethernet

#981
From: Enrico Ferrante
Date: Thu, 30 Jul 1998 00:00
189 lines
6691 bytes
Hi, I give you some other information about my problem and
a print of dmesg, /proc/net/dev, routing...

Please try to say what go wrong... I have tried everything!!

I have installed linux Redhat 5.0 on a Pentium II
I have configured the kernel for the 3com 3c905b
The driver starts, doesn't give errors, ifconfig says that eth0 is Ok
and reports the
right IRQ and I/O address.
But it doesn'work. I have a repeater (DEC repeater 90T), it is NOT
connected to a
backbone but only to a MAC and to the Linux machine using two  10BaseT
cables.
I have configured the TCP/IP on the mac and I have tried to ping and
telnet linux
but it doesn't work!!  :(

Oh, I have configured also the ppp (it does work :-) )  and I have used

ipfwadm -F -a m -S 192.168.1.0/24 -D 0.0.0.0/0

in /etc/rc.d/rc.local

I would like to use the linux machine to connect to INTERNET a masquared
ethernet

Now I print some information

************************

ifconfig:

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Bcast:127.255.255.255  Mask:255.0.0.0
          UP BROADCAST LOOPBACK RUNNING  MTU:3584  Metric:1
          RX packets:9 errors:0 dropped:0 overruns:0
          TX packets:9 errors:0 dropped:0 overruns:0

eth0      Link encap:Ethernet  HWaddr 00:60:08:76:B7:80
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0
          TX packets:1 errors:0 dropped:0 overruns:0
          Interrupt:10 Base address:0x300

**********************

route

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
192.168.1.0     *               255.255.255.0   U     0      0        1
eth0
127.0.0.0       *               255.0.0.0       U     0      0        1
lo

(when ppp is up it is the default routing)

**********************

/etc/hosts

 127.0.0.1       localhost       localhost.localdomain
192.168.1.1     rcs     rcs.nauta.it
192.168.1.2     mac

(rcs is the linux machine, mac is the Mac)

***********************

a part of dmesg after the boot

sysctl: ip forwarding off
Appletalk 0.17 for Linux NET3.035
eth0: 3c509 at 0x300 tag 1, 10baseT port, address  00 60 08 76 b7 80,
IRQ 10.
3c509.c:1.12 6/4/97 becker@cesdis.gsfc.nasa.gov
eth0: Setting Rx mode to 1 addresses.


**********************

lsmod:

Module         Pages    Used by
ip_masq_quake      1            0
ip_masq_vdolive    1            0
ip_masq_cuseeme    1            0
ip_masq_irc        1            0
ip_masq_raudio     1            0
ip_masq_ftp        1            0
3c509              2            1 (autoclean)
isofs              5            1 (autoclean)

*****************************

ps -lax:

FLAGS   UID   PID  PPID PRI  NI   SIZE   RSS WCHAN       STA TTY TIME
COMMAND
   100     0     1     0   0   0    748   404 fifo_open   S   ?   0:03
init [3]
    40     0     2     1   0   0      0     0 add_vfsmnt  SW  ?   0:00
(kflushd)
    40     0     3     1 -12 -12      0     0 swap_tick   SW< ?   0:00
(kswapd)
   140     0    21     1   0   0    724   364 set_dqblk   S   ?   0:00
/sbin/ker
   140     0   172     1   0   0    784   452 fifo_open   S   ?   0:00
syslogd
100140     0   181     1   0   0    880   544 syslog      S   ?   0:00
klogd
100040     2   192     1   0   0    768   408 nanosleep   S   ?   0:00
/usr/sbin
   140     0   203     1   5   0    832   484 nanosleep   S   ?   0:00
crond
   140     0   214     1   0   0   1116   668 fifo_open   S   ?   0:00
/usr/sbin
100140     0   226     1   0   0    760   404 fifo_open   S   ?   0:00
inetd
   140     0   237     1   0   0    776   424 fifo_open   S   ?   0:00
routed
100140     0   248     1   0   0    808   424 fifo_open   S   ?   0:00
lpd
100140     0   262     1   0   0    732   356 fifo_open   S   ?   0:00
gpm -t PS
100100     0   290     1   0   0   1440   948 wait4       S    1  0:00
/bin/logi
100100     0   291     1   0   0    712   316 echo_char   S    2  0:00
/sbin/min
100100     0   292     1   0   0    712   316 echo_char   S    3  0:00
/sbin/min
100100     0   293     1   0   0    712   316 echo_char   S    4  0:00
/sbin/min
100100     0   294     1   0   0    712   316 echo_char   S    5  0:00
/sbin/min
100100     0   295     1   0   0    712   316 echo_char   S    6  0:00
/sbin/min
100140     0   297     1   0   0    708   236 nanosleep   S   ?   0:00
update (b
   100     0   298   290  15   0   1172   776 wait4       S    1  0:00
-bash
100100     0   329   298  16   0    928   500             R    1  0:00
ps -lax




******************************

cat /proc/net/dev

Inter-|   Receive                  |  Transmit
 face |packets errs drop fifo frame|packets errs drop fifo colls carrier

    lo:      9    0    0    0    0        9    0    0    0     0    0
 dummy: No statistics available.
  eth0:      0    0    0    0    0        1    0    0    0     0    0



the Tx packet number increase very slowly, and the Rx stay to 0!!!
if I make

ping -v 192.168.1.2

INCREASE THE NUMBER OF Tx PACKETS ON lo !!!
increase also the number of packet in eth0 TX but more slowly...
and the number of packet Tx by ping is near to the number of packets of
Tx loopback!! I find it very strange.
*****************************


Ok that's all. You are my last chance and then I will have to fire
Linux.
What is wrong for you?
pheraps it is simply the connection via the repeater?

Thank you very much

Bye Stefano



p.s.
please reply via e-mail
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From: Enrico Ferrante <autovie@mail.nauta.it>
Subject: Strange problems with ethernet
Date: 1998/07/30
Message-ID: <35C0C53A.4B56C5E2@mail.nauta.it>
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