post a ipconfig /all from the working and non working pcs for review.
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Alright, you may just switch to Static IP.
Do you have a Windows Server?
You may switch to DHCP back, if you have a server that has DHCP Role configured or a Router in a near future.
Do you have a Windows Server?
You may switch to DHCP back, if you have a server that has DHCP Role configured or a Router in a near future.
Okay... Let's review.
A) You have 3 PCs that all connect, and no need for Internet. This means you don't need a router or a defined default gateway,
B) The APIPA addresses usually mean the computers are enabled for DHCP, but aren't finding a DHCP server. This shouldn't matter, because the three computers all share a common subnet (169.254.x.x), which is why they can see each other and share files. It just isn't the 'normal' way to do it.
The 'normal' way would be to statically assign the IP addresses like so:
Computer A IP Address - 192.168.1.2
Computer B IP Address - 192.168.1.3
Computer C IP Address - 192.168.1.4
All with Subnet mask - 255.255.255.0 and no default gateway, although you could put in 192.168.1.1 if you'd like (this is what a router would default to if it was present).
But your door alarm device could cause an issue with this. If you could access it and statically assign it an address in the same subnet (192.168.1.100, for example) with the same subnet (255.255.255.0) you'd be fine. But it may be difficult to access, so you might want to leave things as they are...
So you call Computer #1 the 'Main Server'. My network is the same, although the 'Main Server' isn't really that at all... What OS is it running? If it's a Windows Server OS, is the DHCP role enabled?
So you have two working PCs that properly communicate with the door alarm through the switch, and also communicate with the door alarm. You said the door alarm is a 1394-adapter, where does it plug into? The 'main server'? This next bit is also a little confusing...
One other thing you could try is just buying a Linksys 4 or 8-port switch (or a router, if you already have one, you'll just use the built-in 4-port switch in it) and swapping that in place of the Blackbox. That should eliminate the switch as being 'bad'.
Lastly, do you know how RoamAlert 'connects'? The fact the 'bad' PC can see and communicate with the others complicates things. 'Something' is interfering with that particular type of communication.
A) You have 3 PCs that all connect, and no need for Internet. This means you don't need a router or a defined default gateway,
B) The APIPA addresses usually mean the computers are enabled for DHCP, but aren't finding a DHCP server. This shouldn't matter, because the three computers all share a common subnet (169.254.x.x), which is why they can see each other and share files. It just isn't the 'normal' way to do it.
The 'normal' way would be to statically assign the IP addresses like so:
Computer A IP Address - 192.168.1.2
Computer B IP Address - 192.168.1.3
Computer C IP Address - 192.168.1.4
All with Subnet mask - 255.255.255.0 and no default gateway, although you could put in 192.168.1.1 if you'd like (this is what a router would default to if it was present).
But your door alarm device could cause an issue with this. If you could access it and statically assign it an address in the same subnet (192.168.1.100, for example) with the same subnet (255.255.255.0) you'd be fine. But it may be difficult to access, so you might want to leave things as they are...
So you call Computer #1 the 'Main Server'. My network is the same, although the 'Main Server' isn't really that at all...
What OS is it running? If it's a Windows Server OS, is the DHCP role enabled?So you have two working PCs that properly communicate with the door alarm through the switch, and also communicate with the door alarm. You said the door alarm is a 1394-adapter, where does it plug into? The 'main server'? This next bit is also a little confusing...
So, let's look at the switch and cabling for a moment. You have 3 PCs plugged into this switch. How many ports does the switch have? If you plug a working computer into the 2nd port and it ALWAYS fails with the same cable, but works when you plug it into one of the other ports, then it sounds like a port or cable issue. Eliminate the cable as the problem by swapping it with a working cable. If the issue follows the cable, then it's a bad cable. If the 2nd port still doesn't connect properly, then the port is somehow messed up.
One other thing you could try is just buying a Linksys 4 or 8-port switch (or a router, if you already have one, you'll just use the built-in 4-port switch in it) and swapping that in place of the Blackbox. That should eliminate the switch as being 'bad'.
Lastly, do you know how RoamAlert 'connects'? The fact the 'bad' PC can see and communicate with the others complicates things. 'Something' is interfering with that particular type of communication.
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