Strange network behaviour
freebsd-questions-local at be-well.no-ip.com
Wed Apr 9 16:07:47 PDT 2003
Vincent Zee <basics at zenzee.cistron.nl> writes:
> 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-
> 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
> dc0 1500 <Link#1> 00:48:54:12:c7:67 5734078 0 5911495 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
> faith 1500 <Link#3> 0 0 0 0
> lo0 16384 <Link#4> 375 0 375 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
> sl0* 552 <Link#6> 0 0 0 0
Okay, so there are no collisions on the FreeBSD side.
Check whatever it's plugged into (a switch?).
If *that* thinks the link is half duplex while FreeBSD thinks it's
full duplex, you've found your problem.
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