High Collision Rate

[QuarkBomb]

Hi,

I have a 100Mbps hub connected via it's uplink port to a 100Mbps switch.
One of the machines connected to the hub is 10Mbps.
Now when the 10Mbps machine wants to transfer files to a machine located on
the switch, the hub experiences vary high collision rates on it's 10Mbps
portion, but no collisions are seen on it's 100Mbps portion or on the
switch.
This is giving me a very poor 100kB/s transfer rate, which is painful when
wanting to transfer 25GB of data!
I have set my network card to both half duplex and full duplex, but it only
ever achieves half duplex, and still has the high collision rate.

Does anyone know what could be causing this, and how I can resolve the
problem?
Could be a bottleneck problem due to the 10/100 switchover? Maybe the
collisions are actually discards and not collisions?

HUB: Netgear DS108
SWITCH: Netgear FS105
NIC: Realtek 10Mbps

Thanks.

--






www.CheaperThanBT.org.uk/2

 

[QuarkBomb]

That was absolutely no use whatsoever.

--






www.CheaperThanBT.org.uk/2
:
http://support.microsoft.com/default.aspx?scid=/directory/worldwide/en-gb/hnetwork.asp
:
: Rho_1r
:
: "QuarkBomb" wrote:
:
: > Hi,
: >
: > I have a 100Mbps hub connected via it's uplink port to a 100Mbps switch.
: > One of the machines connected to the hub is 10Mbps.
: > Now when the 10Mbps machine wants to transfer files to a machine located
on
: > the switch, the hub experiences vary high collision rates on it's 10Mbps
: > portion, but no collisions are seen on it's 100Mbps portion or on the
: > switch.
: > This is giving me a very poor 100kB/s transfer rate, which is painful
when
: > wanting to transfer 25GB of data!
: > I have set my network card to both half duplex and full duplex, but it
only
: > ever achieves half duplex, and still has the high collision rate.
: >
: > Does anyone know what could be causing this, and how I can resolve the
: > problem?
: > Could be a bottleneck problem due to the 10/100 switchover? Maybe the
: > collisions are actually discards and not collisions?
: >
: > HUB: Netgear DS108
: > SWITCH: Netgear FS105
: > NIC: Realtek 10Mbps
: >
: > Thanks.
: >
: > --
: >
: >
: >
: >
: >
: >
: > www.CheaperThanBT.org.uk/2
: >
: >
: >

 

[Michael Pardee]

The hub is unable to mediate the two speeds. You need a
switch for that. Technically, hubs operate in ISO layer 1
(essentially, hardware), switches operate in ISO layer 2
(essentially, packets).

Mike

 

[QuarkBomb]

Plugging the 10Mbps computer into the switch still fives a very high
collision rate. This would suggest that what you say does not solve the
problem.

Thanks.

--






www.CheaperThanBT.org.uk/2
: The hub is unable to mediate the two speeds. You need a
: switch for that. Technically, hubs operate in ISO layer 1
: (essentially, hardware), switches operate in ISO layer 2
: (essentially, packets).
:
: Mike
:
: >-----Original Message-----
: >Hi,
: >
: >I have a 100Mbps hub connected via it's uplink port to a
: 100Mbps switch.
: >One of the machines connected to the hub is 10Mbps.
: >Now when the 10Mbps machine wants to transfer files to a
: machine located on
: >the switch, the hub experiences vary high collision
: rates on it's 10Mbps
: >portion, but no collisions are seen on it's 100Mbps
: portion or on the
: >switch.
: >This is giving me a very poor 100kB/s transfer rate,
: which is painful when
: >wanting to transfer 25GB of data!
: >I have set my network card to both half duplex and full
: duplex, but it only
: >ever achieves half duplex, and still has the high
: collision rate.
: >
: >Does anyone know what could be causing this, and how I
: can resolve the
: >problem?
: >Could be a bottleneck problem due to the 10/100
: switchover? Maybe the
: >collisions are actually discards and not collisions?
: >
: >HUB: Netgear DS108
: >SWITCH: Netgear FS105
: >NIC: Realtek 10Mbps
: >
: >Thanks.
: >
: >--
: >
: >
: >
: >
: >
: >
: >www.CheaperThanBT.org.uk/2
: >
: >
: >.
: >