Strange network behaviour

[Vincent Zee]

On 09 Apr 2003 16:39:03 -0400, Lowell Gilbert wrote:
> Vincent Zee <basics at zenzee.cistron.nl> writes:
> 
>>  I am really at a loss at the moment.
>>  
>>  I have a 100baseT network at home and all connected machines have 100Mb 
>>  network cards.
>>  When I upload mp3 files from my ibook to the FreeBSD server the speed 
>>  drops to 100kb/s.
>>  
>>  This only happens between these two particular machines. These same 
>>  machines connected to other machines give the expected transmission 
>>  speeds. I checked cables, switches and router but found nothing 
>>  unexpected.
>>  
>>  Any hints, ideas or even solutions are most welcome.
>>  
>>  The FreeBSD machine is running 4.7 and the ibook 10.2.4
> 
> This sounds a lot like a duplex mismatch. 
> Check the collision count.

Hi Lowell,

thank you for your answer(:-))

Here is the ifconfig output for the nic in the freebsd machine:

dc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 192.168.1.10 netmask 0xffffff00 broadcast 192.168.1.255
        inet6 fe80::248:54ff:fe12:c767%dc0 prefixlen 64 scopeid 0x1 
        ether 00:48:54:12:c7:67
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active

Here is the ifconfig output for the nic in the ibook:

en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::20a:95ff:fe67:2460%en0 prefixlen 64 scopeid 0x4 
        inet 192.168.1.3 netmask 0xffffff00 broadcast 192.168.1.255
        ether 00:0a:95:67:24:60 
        media: autoselect (100baseTX <full-duplex>) status: active
        supported media: none autoselect 10baseT/UTP <half-duplex> 
10baseT/UTP <half-duplex,hw-loopback> 10baseT/UTP <full-duplex> 
10baseT/UTP <full-duplex,hw-loopback> 100baseTX <half-duplex> 100baseTX 
<half-duplex,hw-loopback> 100baseTX <full-duplex> 100baseTX <full-
duplex,hw-loopback>


Here is the output of netstat -i during a transmission of a 14 MB file.

-bash-2.05b$ netstat -i
Name  Mtu   Network       Address            Ipkts Ierrs    Opkts Oerrs 
 Coll
dc0   1500  <Link#1>    00:48:54:12:c7:67  5734078     0  5911495     0 
    0
dc0   1500  192.168.1     freeserv         5728716     -  5910566     - 
    -
dc0   1500  fe80:1::248 fe80:1::248:54ff:        0     -        0     - 
    -
lp0*  1500  <Link#2>                             0     0        0     0 
    0
faith 1500  <Link#3>                             0     0        0     0 
    0
lo0   16384 <Link#4>                           375     0      375     0 
    0
lo0   16384 ::1         ::1                      0     -        0     - 
    -
lo0   16384 fe80:4::1   fe80:4::1                0     -        0     - 
    -
lo0   16384 your-net      localhost            375     -      375     - 
    -
ppp0* 1500  <Link#5>                             0     0        0     0 
    0
sl0*  552   <Link#6>                             0     0        0     0 
    0

/\
Vincent