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Cannot connect PC to network

By alexius ·
I have a small peer 2 peer network plus DSL modem connected to an 8 port Fast Ethernet Switch. Network has always worked fine in past - same cables / switch etc. Moved to new location and added new computer (all XP Pro with SP2).
PC settings
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . :
Subnet Mask . . . . . . . . . . . :
IP Address. . . . . . . . . . . . : fe80::250:baff:fe66:2760%4
Default Gateway . . . . . . . . . :

Tunnel adapter Teredo Tunneling Pseudo-Interface:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : fe80::5445:5245:444f%5
Default Gateway . . . . . . . . . :

Tunnel adapter Automatic Tunneling Pseudo-Interface:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : fe80::5efe:
Default Gateway . . . . . . . . . :

No idea where the tunnel settings come from.
Laptop has much simpler setttings - and works in network
IP Address:
Subnet mast:
Default Gateway:

The PC will talk to the ADSL modem - but to nothing else on the network.
Network wizard used 100's of times. Ipconfig release etc used. No joy.
I cannot talk to the PC!
When I try to set Ip addreses automatically - I keep getting an IP conflict with another computer on the netwrok error.
Any ideas?

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by sgt_shultz In reply to Cannot connect PC to netw ...

is the Windows Firewall turned off? (get at it thru control panel)

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by alexius In reply to Cannot connect PC to netw ...

I have tested with firewall on and off - no difference

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by CG IT In reply to Cannot connect PC to netw ...

well provided that the IP, subnet mask, default gateway addresses for the ethernet adapter are correct and you've made no mistakes, I would say that the default gateway address is incorrect because it points to the LAN [itself]. If this is a single homed NIC computer being used at the gateway out you need to run the ICS wizard again to establish the Network address translation pool for LAN clients to share the DSL connection. For alot less hassel at $60.00 USD give or take $10.00, but a consumer level router with a built in 4 port 10/100 switch.

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by CG IT In reply to

your switch is not a router. It does not have NAT capabilities nor routing capabilities. When you connect your WAN connection to your switch, the switch does not obtain an IP address subnet mask and default gateway, setup NAT and create a routing table. A router does that. Your best bet is to get a router, insert it into your network between your modem and 12port switch.

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by paco In reply to Cannot connect PC to netw ...


It looks as though the pc is connected directly to the DSL modem and is connected via PPOE. That may explain why the gateway of the PC is the same as the ip. The connection is virtual.

Aside from the fact that the laptop is on a different subnet, The gateway is not setup.
So even if you had a router between the two, the laptop would have no idea how to get to that 165.X network.

So the inference would be that the machines are in the same broadcast domain. But that would only work if the machines were on the same subnet.

So we are left with the question, How is this network set up?

You have a DSL modem plugged directly into the switch. Is it a router as well?

You have the PC plugged into the switch.
Are you using a PPOE client on the PC to connect to the internet?

You have the laptop plugged into the switch.
Does it have a PPOE client as well?

Is it connected?

And finally the previous post to check the firewall on the XP machines wouldnt hurt.

But even if they were disabled, I dont see how they would communicate given the info that you have posted.

Best regards,


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by alexius In reply to Cannot connect PC to netw ...

Network linked to Fast Ethernet 8 port switch. ADSL Modem (D-Link DSL300T) connected to switch. Laptop, Problem PC, another PC connected to switch. Problem PC connects to internet via switch via DSL modem. PPOE connection.
Modem settings:
MAC Address 00:0F:3D:F0:4B:DC
IP Address
Subnet Mask
DHCP Server Running
Modem is meant to set IP addresses. Settings are meant to be auto IP. If lapop and Problem PC are both set to automatically assign IP addesses (and DNS) - then get conflict - "There is an IP address conflict with another system on the netork"

Firewall on/off makes no difference

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