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Author Topic: SMB Forwarding Not Working  (Read 34345 times)

MMarshall

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SMB Forwarding Not Working
« on: August 14, 2012, 01:19:40 PM »

It may be that I'm trying to do something that's not possible, and I'm just not experienced enough with networking to realize it, but here's my situation:

Due to a lengthy series of events that aren't relevant, the D-Link router in question is being used wired-only (wireless disabled entirely) to take a DHCP WAN connection and share it to the LAN.  I want to give computers on the WAN (which is actually a VLAN on a much larger campus network) file sharing access to a single computer on the internal LAN.

To this end, I set the WBR-2310 to give a static IP address to the computer in question, and to port forward ports 445 and 135-139 to it.  This didn't work--trying to access the external IP address just times out.  Its network name doesn't work, either.

I then tried adding the internal computer to the DMZ.  Same result.  I also tried forwarding ports 1-65000 for both TCP and UDP; also no luck.  I also don't get any ping response from the external address, despite having ping enabled in the D-Link menus.

Now, RDC does work just fine from the outside, so port forwarding is at least partly working.  And file sharing is set up properly on the computer, because when connected to the internal network, I can access the computer via SMB both using its (internal 192.*.*.*) IP address and its name.  It's just when connecting from the WAN that I get no response at all.

Is there a routing issue that I'm not understanding here, or is there a checkbox somewhere that I'm missing?
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FurryNutz

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Re: SMB Forwarding Not Working
« Reply #1 on: August 14, 2012, 01:29:31 PM »

Are you using an FTP server program or something like that on the PC as a server and using FTP clients to access this PC? I might try using an FTP program maybe.

This VLAN, any NAT router located here. This might be an issue with the hosting router as well.
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MMarshall

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Re: SMB Forwarding Not Working
« Reply #2 on: August 14, 2012, 03:46:56 PM »

I'm attempting to use Windows' built-in file sharing rather than FTP for convenience's sake.  Ideally getting it to respond to the NetBIOS name, since it would cover situations when the IP address changed, but at this point I'd like to even get SMB access via direct IP address working.

In answer to the second question, I don't think so; other machines on the VLAN have, as far as I can determine, completely unfettered access to each other.  They respond properly to all SMB and ping requests, and NetBIOS names also resolve correctly on the VLAN.

The VLAN (and DHCP services at that level) are set at a higher corporate IT level, so I can't actually check the hardware or settings, though.
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FurryNutz

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Re: SMB Forwarding Not Working
« Reply #3 on: August 17, 2012, 09:23:36 AM »

Seems that it could be in configuration of the router or something on this VLAN between it and the router and the PC that seems to be holding something up.

I would also make sure that any 3rd party security programs are temporarily disabled as some could be causing a block.
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