LAN: Destination Host Unreachable between 2 PC, W7 running - Pls HELP?

[amdk620]

Hi, Need some help on this pls. I've 3 PC running on a LAN, PC1 IP is 192.168.0.2, PC2 IP is 192.168.0.3, PC3 IP is 192.168.0.4 & Router (gateway) IP is 192.168.0.1.

PC1 is running a built in LAN card - realtek gb lan
PC2 is running a addon LAN (pci-e x1 slot card) - realtek gb lan NIC
PC3 is running a addon LAN (pci-e x1 slot card) - realtek gb lan NIC

When I want to transfer some files from PC1 to PC2 or 3 - I can do that via COMPUTER/NETWORK.
But when I want tod o the same thing from PC2 to 3 - I cannot see the other pc via the same method.
Transfering files between PC2 or 3 to PC1 is also no problem.

It seem I need to do some setting on the addon NIC on PC2 & 3, but after some research I still cannot get it connected from PC2 to 3? Any help pls, many thanks.

Here's what I've done - static routing setting within router (netgear DG834G v4) configuration. Set Name/Destination IP/Gateway/metric - PC2:PC2/192.168.0.3/192.168.0.1/2 & PC3:PC3/192.168.0.4/192.168.0.1/2
then reboot router & reboot PC2 & 3 - Cannot see each other??

[Cornucopia]

Why is this static? Can't you make your Netgear router/gateway be a DHCP server? That would probably make setup a lot easier.

Then once that is setup ok, do a ping from each pc to all the others (and the router, and itself via loopback, and itself via ip address). So that's 15 pings.

If everything is ok then, your ip stuff is configured ok and it's just a matter of higher level protocols: WINS, DNS, SMB, etc. (or port/packet filtering is enabled)

It would help if you told us EXACTLY and COMPLETELY what each and every box had, in terms of: Model #, RAM, OS version, OS sub-version, Network domain config (domain vs. workgroup), etc

Scott

[amdk620]

My router has been setted to both STATIC & DHCP, it will works on both - just adjust the setting from PC NIC properties. Tried both & still not working. I've ping from PC2 to PC3, getting 3 msg "Destination Host Unreachable" with packet sent 4, received 4, loss=0.

PC2 specs: 775 mobo, E2160cpu, 2gb ram, windows 7, windows workgroup, realtek gb lan pci-e x1.
PC3 specs: 775 mobo, 640cpu 3.2ghz, 2gb ram, windows 7, windows workgroup, realtek gb lan pci-e x1.

[neomaine]

Yah, drop the statis IP addresses and make sure they're all using DHCP, much easier. If you must, simply setup a range of available addresses. Using DHCP will make sure that the correct IPs and a appropriate and correct subnet mask (like 255.255.255.0) is being used.

Additionally, if you want you're PCs to use Windows netowrk tools (see each other in Network and Windows Explorer) you should have them all in the same Workgroup. Avoid that Homegroup crap.

You'll also have to enable sharing across all the PCs. Personally, I'd share at the drive level for ease (get more granular if you like to share only certain folders...) and name them appropriately. Like PC1-D for PC1's D drive...

[Cornucopia]

If you are pinging (using ip #s not names) and are getting "Destination Unreachable", you likely have either a wiring issue (bad cable, port, switch, etc) or an address conflict (2 devices trying to use the same #), or you have one or more of your machines set up to not respond to ICMP/ping requests.

Fix that first, test the machines all over again, then get back to us.

Scott

[Nelson37]

You gave the specs for PCs #2 and #3, how about for #1, you know, the only one that works differently?

On the static IP issue, I strongly disagree with the opinions expressed. Using static, with a low number of PC's and assuming you can count, there is nothing to go wrong. Using DHCP on the router, if DHCP fails then you got no network and no Internet. I have seen MULTIPLE failures of DHCP on routers, permanent, intermittant, and one-time. Static IP addresses do not fail.

Can all PC's access the Internet? What firewall and/or antivirus software is loaded? Several such progs are somewhat problematic in setting firewall exceptions.

If you can get on the Internet, and each transfer to at least one other, then it ain't wiring or addressing, it's permissions or firewalling.

[Bjs]

Everything seems right but when I do drive mapping there was an issue with user names ... each system should be using a unique identifier as name ... "admin" can refuse to talk to another "admin" on a network because it is already logged onto that system.

[Des]

I'm no networking expert, but I know that I have had issues in the past due to the software firewall on a machine being set incorrectly and refusing to let computer A talk to computer B or C. Is it possible this could be the issue for the OP?

--dES

[amdk620]

To me there's no difference between DHCP or static, I'm running a P2P software on one PC, the only way I know it will work through both router firewall & windows software(s) based firewall is via static IP. Anyway, the other day I re-adjust the settings within NIC card in DEVICE MANAGER/NETWORK ADAPTER/nic ADVANCED option, and in NETWORK ADDRESS I put in the IP address for that particular PC (PC2) & did the same thing on PC3, then tried to see if it can see each other within COMPUTER/NETWORK, it can but it will not open access to the PC. Since then I've resetted the NIC properties back to its previous state, I tried to do samething again yesterday, it couldn't even see each other on the NETWORK, both PC NIC has been resetted back to original state.

I've tested both DHCP or static with & without both hardware & software firewalls disabled - both doesn't work, couldn't even see each other on NETWORK.

PC1 Specs: 775mobo, 3ghz cpu (not sure what the model is, but it is 64bit processor), windows 7, windows workgroup/ mobo built-in realtek gb lan.

As stated I can transfer files from PC1 to either PC2 or 3 & vice versa, but not PC2 to 3 (which both uses a addon NIC).

All 3 PCs are auto log-on with single administrator a/c. All able to connect to internet without any problem.

Subnet is 255.255.255.0

Yesterday when I tried to set both PC2 & 3 on DHCP mode within windows, I noticed that both PC2 & 3 have the same IP address assigned by router dhcp, is that normal?

[amdk620]

PC addon NIC chipset is FPE G24102MK-R 0920T, if it's any help?

[Cornucopia]

Yesterday when I tried to set both PC2 & 3 on DHCP mode within windows, I noticed that both PC2 & 3 have the same IP address assigned by router dhcp, is that normal?

No it's not normal.

Like I said before, you've got to walk before you can run. Fix the cabling/hardware. Then fix the IP addresses. Then work your way up the protocol stack...

If you can't even PING correctly all around, you've got fundamental problems that adversely influence everything else you are trying to do.

Scott

[amdk620]

Pinging from PC1 to either PC2 or 3 is fine & vice versa. Patch cables on all pc are fine, all pc have internet access, so what's the problem? One thing I would try tomorrow is to use crossover cable from PC2 to PC3 see if it will link, I will let you know tomorrow, if so then definately the setting problem for NIC & windows network.

[themaster1]

i've set up a network between pc's with win7 /ubuntu recently so i think i can help. If you can't share files it's probably because your router/switch has been set up for a Public network. Public network don't work with file sharing whereas home/work network do.

Go in control panel >> network & sharing center, there you should see your router with "public network" written, click on "public network" and change it to home or work network

Once this is done, there are advanced settings to not overlook in "choose homegroup and sharing options" >> change advanced settings

basically you don't want password protection at least at first to test so you disable that

Try all that & report

[Nelson37]

DHCP giving two pc's the same address is EXACTLY the type of DHCP failure I was talking about. The difference with static is that this will not happen due to a router failure. One possible failure point ELIMINATED. I would suggest you do a static setup to remove this problem.

This may, or may not, point to router failure. I have had multiple routers fail DHCP but otherwise continue to work fine for years. Others have failed completely after having a similar problem. Crapshoot.

The suggestion to set network type to Home or Work is excellent, this should be done and also check the status on PC1, the unit that works. This is related to the firewalling I mentioned earlier. This has nothing at all to do with the router/switch, it is an internal Win 7 issue. This setting is usually the source of Win7 connectivity issues.

Do ALL the Admin accounts have a password, and all the same password?

[amdk620]

All PCs are setup via static IP addresses, no admin password on windows logon setups on all pcs (pc is already slow enough), all pcs are setup on home/private network without password, ALLOW sharing mode were selected.

I did crossover cable test yesterday (linking straight from PC2 to 3 without router in between), it's been a long time since i used it, so i setup the 2pcs (PC2 &3) with IPs PC2:192.168.0.3/255.255.255.0/192.168.0.4 & PC3:192.168.0.4/255.255.255.0/192.168.0.3, it doesn't work, could not see each other on the network. I'm clueless from now on.

I've emailed to seller who sold these NIC and are awaiting for a response.

[Nelson37]

It is NOT the NICs, they all get on the Internet. Cable, router, NIC all tested and VERIFIED by this simple act. The problem is Windows. The network communication that is failing between #2 and #3 WORKS for #1 to either #2 or #3. There is something different between the setup on #1 and both #2 and #3. THE PROBLEM IS NOT *REPEAT* NOT HARDWARE.

Set an admin password. Make all PC's the same admin password. Turn OFF the firewall.

REPEAT - What antivirus and/or firewall software is loaded? Something is blocking network access and these types of softwares are prime candidates.

[themaster1]

In my dhcp setup it is set as such:

ip adress start: 192.168.1.10
ip adress end: 192.168.1.150

Basically the dhcp assign adresses from 10 to 150 , 10 (being my main computer)


verify you have similar values

[amdk620]

themaster1

Go in control panel >> network & sharing center, there you should see your router with "public network" written, click on "public network" and change it to home or work network

Once this is done, there are advanced settings to not overlook in "choose homegroup and sharing options" >> change advanced settings
************************************************** **************

Tried aLL that, i set all 3 pcs the same way & same settings in these areas.
----------------------------------------------------------------

Nelson37

Set an admin password. Make all PC's the same admin password. Turn OFF the firewall.

REPEAT - What antivirus and/or firewall software is loaded? Something is blocking network access and these types of softwares are prime candidates.
************************************************** ***************

with/out admin password won't make any difference.

ESET Smart security/windows firewall loaded & both were disabled during tests.

Just another note, the mobo on PC2 & 3 have built-in LAN card but were disabled (reason PC2 has faulty onboard LAN & PC3 is running at 100mbs) in BIOS setup. I don't know if 1. I need to set something up in BIOS or 2. I need to tell the router that PC2 & 3 do exist in the LAN network? But reason 2 doesn't apply because I've connected up linking PC2 & 3 together with acrossover cable and it still can't see other on the network, may be the problem lie within bios setup, because I've tried everything within windows, and nothing works.

[amdk620]

Problem SOLVED!! Because these addon NIC cards are the same type, they have the same MAC address(es), all you needs to do is change 1 of the MAC address & problem solved. This is done within DEVICE MANAGER/NETWORK CARD - properties settings & enter a different value for MAC address. Hence it also explain why the same IP addresses when used in DHCP mode, the router thinks it's same pc.

Thanks again to all above replies, signing off.