Hi Bill,
try running ethtool on the NIC and try to see if there's a link and what
mode it's configured in.. you can also try to hard set the link modes with
ethtool.. depending upon the switch type you may be able to hard set on it
as well
# ethtool eth0
Settings for eth0:
Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes
On 9/20/07, bill <[EMAIL PROTECTED]> wrote:
>
> I have a home LAN of 4 PCs and 1 laptop.
>
> Connected phone-line --> modem/router --> gigabit ethernet switch -->
> PCs ( via CAT5 cable)
>
> Problem: the laptop and 3 PCs connect to the 'Net OK.
>
> 4th PC won't even ping the modem/router, although it did access the 'Net
> properly a couple of months ago ( when I last used the PC).
>
> However:-
>
> 1) if I disconnect this PC from the ethernet switch and connect the
> cable directly into the modem/router I can access the 'Net.
>
> 2) if I connect the laptop to the LAN cable that is normally plugged ino
> the problem PC, the laptop connects to the 'Net
>
> 3) if I boot the problem PC from a LiveCD I can connect to the 'Net via
> the switc and modem/router.
>
> 4) if I change the problem PC from fixed IP to "connect b DHCP" it still
> wont connect.
>
> The problem PC has its' /etc/network/interfaces file setup correctly (
> verified against other PCs - just different IP).
>
> The problem PC doesn't have a firewall.
>
> All PCs are running Kubuntu - 6.10 in the case of the problem PC.
>
> The ony thing that has changed is the ethernet switch from a 10/100 to a
> gigabit switch. The PC's mobo has gigabit LAN.
>
> All PCs have fixed IPs ( fixed to that determined automatically by
> DHCP). I have changed the problem PCs IP to match that provided by the
> new gigabit switch.
>
> There are no conflicting IPs.
>
> All IPs fall within the range set in the LAN portion of the modem/router.
>
> From above test have determined that there are no problems with the
> cables, modem/router or ethernet switch.
>
> Advice please.
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