I have 2 PC's on a LAN. One of them is a midi tower case a Realtek 8139, the
other is a micro-ATX with an onboard NVidia networking controller. I can
connect both PCs at 10mbit/s half duplex just fine but I cannot connect them
properly at 100mbit/s half duplex. I have even searched
PracticallyNetworked.com and found nothing that relates to this problem.

With the main PC using the Realtek 8139 we had an older PC ages ago on the
other end, also using an 8139. This worked fine at 100mbit/s half duplex, so
this rules out any physical problem

At the moment it is on 10mbit/s half duplex but I want 100mbit/s. How can I
sort this out?

Sim

"Sim" <(E-Mail Removed)> wrote in
news:EVQ4f.2583$(E-Mail Removed):

> I have 2 PC's on a LAN. One of them is a midi tower case a Realtek
> 8139, the other is a micro-ATX with an onboard NVidia networking
> controller. I can connect both PCs at 10mbit/s half duplex just
> fine but I cannot connect them properly at 100mbit/s half duplex.
> I have even searched PracticallyNetworked.com and found nothing
> that relates to this problem.
>
> With the main PC using the Realtek 8139 we had an older PC ages
> ago on the other end, also using an 8139. This worked fine at
> 100mbit/s half duplex, so this rules out any physical problem
>
> At the moment it is on 10mbit/s half duplex but I want 100mbit/s.
> How can I sort this out?
>

Need more information. How are the two computers connected?

Half-Duplex implies that they are connected through a hub. Does the
hub support 100-Base-T? By the time 100-Base-T became popular, hubs
were being replaced with switches so running with a hub at 100-Base-
T is unusual. If you have a router or switch connecting them, then
the proper setting is probably Full Duplex instead. Does the
router/hub support 100-Base-T?

100-Base-T is faster and also requires a higher quality cable
connection. Make sure that all your cabling is at least Cat 5 and
it is in good condition. Also make sure no cable runs are over 100
meters in length. If the RJ-45 connections at the cable ends are
home-made, make sure that the proper color wire is in the proper pin
-- correct twisted pair grouping must be maintained.

HTH,
John

"John Wunderlich" <(E-Mail Removed)> wrote in message
news:Xns96F2824B9AB1Bwunderpsdrscraytheon@138.126.254.210...
> "Sim" <(E-Mail Removed)> wrote in
> news:EVQ4f.2583$(E-Mail Removed):
>
>> I have 2 PC's on a LAN. One of them is a midi tower case a Realtek
>> 8139, the other is a micro-ATX with an onboard NVidia networking
>> controller. I can connect both PCs at 10mbit/s half duplex just
>> fine but I cannot connect them properly at 100mbit/s half duplex.
>> I have even searched PracticallyNetworked.com and found nothing
>> that relates to this problem.
>>
>> With the main PC using the Realtek 8139 we had an older PC ages
>> ago on the other end, also using an 8139. This worked fine at
>> 100mbit/s half duplex, so this rules out any physical problem
>>
>> At the moment it is on 10mbit/s half duplex but I want 100mbit/s.
>> How can I sort this out?
>>
>
> Need more information. How are the two computers connected?
>
Both computers are directly connected with a crossover cable.
>
> 100-Base-T is faster and also requires a higher quality cable
> connection. Make sure that all your cabling is at least Cat 5 and
> it is in good condition. Also make sure no cable runs are over 100
> meters in length.

Done that. If the Realtek 8139 works with the same card on the other PC,
then surely it must work with the NVidia network controller, but its not
working at 100Mbps.

Sim

Sim wrote:
> "John Wunderlich" <(E-Mail Removed)> wrote in message
> news:Xns96F2824B9AB1Bwunderpsdrscraytheon@138.126.254.210...
>
>>"Sim" <(E-Mail Removed)> wrote in
>>news:EVQ4f.2583$(E-Mail Removed):
>>
>>
>>>I have 2 PC's on a LAN. One of them is a midi tower case a Realtek
>>>8139, the other is a micro-ATX with an onboard NVidia networking
>>>controller. I can connect both PCs at 10mbit/s half duplex just
>>>fine but I cannot connect them properly at 100mbit/s half duplex.
>>>I have even searched PracticallyNetworked.com and found nothing
>>>that relates to this problem.
>>>
>>>With the main PC using the Realtek 8139 we had an older PC ages
>>>ago on the other end, also using an 8139. This worked fine at
>>>100mbit/s half duplex, so this rules out any physical problem
>>>
>>>At the moment it is on 10mbit/s half duplex but I want 100mbit/s.
>>>How can I sort this out?
>>>
>>
>>Need more information. How are the two computers connected?
>>
>
> Both computers are directly connected with a crossover cable.

You don't have 10 bucks for a switch?

>
>>100-Base-T is faster and also requires a higher quality cable
>>connection. Make sure that all your cabling is at least Cat 5 and
>>it is in good condition. Also make sure no cable runs are over 100
>>meters in length.
>
>
> Done that. If the Realtek 8139 works with the same card on the other PC,
> then surely it must work with the NVidia network controller, but its not
> working at 100Mbps.
>
> Sim
>
>


--
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"CJT" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Sim wrote:
>> "John Wunderlich" <(E-Mail Removed)> wrote in message
>> news:Xns96F2824B9AB1Bwunderpsdrscraytheon@138.126.254.210...
>>
>>>"Sim" <(E-Mail Removed)> wrote in
>>>news:EVQ4f.2583$(E-Mail Removed):
>>>
>>>
>>>>I have 2 PC's on a LAN. One of them is a midi tower case a Realtek
>>>>8139, the other is a micro-ATX with an onboard NVidia networking
>>>>controller. I can connect both PCs at 10mbit/s half duplex just
>>>>fine but I cannot connect them properly at 100mbit/s half duplex.
>>>>I have even searched PracticallyNetworked.com and found nothing
>>>>that relates to this problem.
>>>>
>>>>With the main PC using the Realtek 8139 we had an older PC ages
>>>>ago on the other end, also using an 8139. This worked fine at
>>>>100mbit/s half duplex, so this rules out any physical problem
>>>>
>>>>At the moment it is on 10mbit/s half duplex but I want 100mbit/s.
>>>>How can I sort this out?
>>>>
>>>
>>>Need more information. How are the two computers connected?
>>>
>>
>> Both computers are directly connected with a crossover cable.
>
> You don't have 10 bucks for a switch?

I don't have a spare mains socket for a switch, never mind £5. I use all my
mains sockets for my music gear.

Sim wrote:

> "CJT" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>
>>Sim wrote:
>>
>>>"John Wunderlich" <(E-Mail Removed)> wrote in message
>>>news:Xns96F2824B9AB1Bwunderpsdrscraytheon@138.126.254.210...
>>>
>>>
>>>>"Sim" <(E-Mail Removed)> wrote in
>>>>news:EVQ4f.2583$(E-Mail Removed):
>>>>
>>>>
>>>>
>>>>>I have 2 PC's on a LAN. One of them is a midi tower case a Realtek
>>>>>8139, the other is a micro-ATX with an onboard NVidia networking
>>>>>controller. I can connect both PCs at 10mbit/s half duplex just
>>>>>fine but I cannot connect them properly at 100mbit/s half duplex.
>>>>>I have even searched PracticallyNetworked.com and found nothing
>>>>>that relates to this problem.
>>>>>
>>>>>With the main PC using the Realtek 8139 we had an older PC ages
>>>>>ago on the other end, also using an 8139. This worked fine at
>>>>>100mbit/s half duplex, so this rules out any physical problem
>>>>>
>>>>>At the moment it is on 10mbit/s half duplex but I want 100mbit/s.
>>>>>How can I sort this out?
>>>>>
>>>>
>>>>Need more information. How are the two computers connected?
>>>>
>>>
>>>Both computers are directly connected with a crossover cable.
>>
>>You don't have 10 bucks for a switch?
>
>
> I don't have a spare mains socket for a switch, never mind £5. I use all my
> mains sockets for my music gear.
>
>
What would be so awful about full duplex, then?

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The e-mail address in our reply-to line is reversed in an attempt to
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"Sim" <(E-Mail Removed)> wrote in news:OMV4f.5898$6i4.5776
@newsfe7-gui.ntli.net:

>>
>> Need more information. How are the two computers connected?
>>
> Both computers are directly connected with a crossover cable.
>

With a crossover cable and half-duplex, the NIC on the receiving end
won't echo back the traffic sent to it by the sending side (like a hub
would) so the sender doesn't see his own traffic on the line so he
thinks his packet was trounced. This results in aborted traffic and
constant retries and it probably will never succeed. Use Full Duplex
in this configuration.

HTH,
John

> What would be so awful about full duplex, then?

Hardly any difference between half duplex and full duplex when it comes to
normal internet usage.

> --
> The e-mail address in our reply-to line is reversed in an attempt to
> minimize spam. Our true address is of the form che...@prodigy.net.

"John Wunderlich" <(E-Mail Removed)> wrote in message
news:Xns96F3E298B8414wunderpsdrscraytheon@216.196.97.142...
> "Sim" <(E-Mail Removed)> wrote in news:OMV4f.5898$6i4.5776
> @newsfe7-gui.ntli.net:
>
>>>
>>> Need more information. How are the two computers connected?
>>>
>> Both computers are directly connected with a crossover cable.
>>
>
> With a crossover cable and half-duplex, the NIC on the receiving end
> won't echo back the traffic sent to it by the sending side (like a hub
> would) so the sender doesn't see his own traffic on the line so he
> thinks his packet was trounced. This results in aborted traffic and
> constant retries and it probably will never succeed. Use Full Duplex
> in this configuration.

I did set it to 100Mbps full duplex and it still won't work properly.

Sim

Sim wrote:
>>What would be so awful about full duplex, then?
>
>
> Hardly any difference between half duplex and full duplex when it comes to
> normal internet usage.

So ... problem solved.
>
>
>>--
>>The e-mail address in our reply-to line is reversed in an attempt to
>>minimize spam. Our true address is of the form che...@prodigy.net.
>
>
>


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