Help with a 'different' setup :)

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ZollyMonsta

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#18845 25-Jan-2008 23:55

Hullo. :)

Ok, this is what I set up the other night.

PC has PCI Network card (Card A)
Card A is connected through Linksys router (WRT54GS), in turn connected to Cable Modem A
Cable Modem B is connected via USB to the same PC
FTP Server 1 is on a non-standard FTP Port (say for example port 22)
FTP Server 2 is on FTP Port 21

FTP for Card A is fine and FTP Works with FTP Server 1
FTP for Cable Modem B on FTP Port 21 works ok, however I need passive FTP and it seems to choke here. The connection occurs but when the PASV command is issued all traffic stops. I think something is going awry and the passive mode data channels are attempting to go through Card A and my Linksys Router instead of through Cable Modem B.

Is there a way on the PC to force passive data through Cable Modem B? I think I've heard something about routing tables which can be defined, but not sure how this works. PC is running Windows XP Home Edition (SP2).

Cheers,
Grant

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geekiegeek

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#106841 26-Jan-2008 05:24

From the server-side firewall's standpoint, to support passive mode FTP the following communication channels need to be opened:

FTP server's port 21 from anywhere (Client initiates connection)
FTP server's port 21 to ports > 1023 (Server responds to client's control port)
FTP server's ports > 1023 from anywhere (Client initiates data connection to random port specified by server)
FTP server's ports > 1023 to remote ports > 1023 (Server sends ACKs (and data) to client's data port)

Taken from - http://www.slacksite.com/other/ftp.html

Google is your friend.

ZollyMonsta

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#106846 26-Jan-2008 08:52

You miss my point. The passive mode is not supposed to be going through my firewall. It is supposed to be going through the second cable modem.

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Spyware

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#106879 26-Jan-2008 13:26

route add /?

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ZollyMonsta

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#106898 26-Jan-2008 15:01

Ok will that work for ports also?

Just being very wary as this PC also handles my streaming and don't wanna break it.

So if I wanted to ensure all traffic coming through the below interface also went back out the same interfaced (including passive ftp) what would I need to enter? And how could I 'reset' what I've done if it breaks? :)

121.73.**.127 - IP
255.255.255.0 - Subnet
121.73.71.1 - Gateway
203.96.152.4 - DNS Pri
203.96.152.12 - DNS Sec

Cheers,
Grant

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#106901 26-Jan-2008 15:27

If ftping to 213.215.214.10 then route add 213.215.214.10 255.255.255.0 121.73.**.127 (cable modem b interface is gateway) etc. Traffic to 213.215.214.10 will go out cable modem b interface rather than default gateway.

ZollyMonsta

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#106904 26-Jan-2008 16:07

Thanks Ross, I'll give that a try later.

If after I add that line, I wish to remove it, I would type this

route delete 213.215.214.10

?

Cheers,
Grant

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ZollyMonsta

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#106912 26-Jan-2008 17:12

That gives me

Bad Argument: 213.215.214.10

(I of course substituted the above for the IP of the PC that's connecting to the local PC via ftp).

:(

Spyware: If ftping to 213.215.214.10 then route add 213.215.214.10 255.255.255.0 121.73.**.127 (cable modem b interface is gateway) etc. Traffic to 213.215.214.10 will go out cable modem b interface rather than default gateway.

ZollyMonsta

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#107002 27-Jan-2008 09:44

tried several different commands but still no joy. :(

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#107006 27-Jan-2008 10:00

http://technet2.microsoft.com/windowsserver/en/library/31bb32f5-99b7-4685-9542-24337b5deb401033.mspx?mfr=true

e.g., route add 213.215.214.10 mask 255.255.255.0 121.73.91.127

ZollyMonsta

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#107008 27-Jan-2008 10:13

Spyware: http://technet2.microsoft.com/windowsserver/en/library/31bb32f5-99b7-4685-9542-24337b5deb401033.mspx?mfr=true

e.g., route add 213.215.214.10 mask 255.255.255.0 121.73.91.127

Ok, tried what you suggested, also looked at the microsoft page.. Below is what I entered and the error I get
(end of IPs removed for security reasons) :)

C:\>route add 121.73.71.xxx mask 255.255.255.0 121.73.71.xxx
                     ^^^^^^^^^^          ^^^^^^^^^^   ^^^^^^^^^^
             External IP               Subnet             IP of CableModem connected via USB


The route addition failed: The specified mask parameter is invalid. (Destination & Mask) != Destination.

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#107010 27-Jan-2008 10:26

24 bit subnet masks are class c. 121.xxx. etc isn't a class c address, it is a class a address and has an 8 bit subnet mask.

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ZollyMonsta

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#107016 27-Jan-2008 11:07

Spyware: 24 bit subnet masks are class c. 121.xxx. etc isn't a class c address, it is a class a address and has an 8 bit subnet mask.

Sorry, that's all Japanese to me :) So the cable modem's subnet of 255.255.255.0 won't work for what I'm trying to do?

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#107018 27-Jan-2008 11:32

Do a route print and post entire routing table.

ZollyMonsta

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#107082 27-Jan-2008 22:42

I've sent you a PM

ZollyMonsta

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#107266 28-Jan-2008 21:14

Ok, all fixed. Had some guys at work take a look at my routing and could see nothig wrong.
Took another look at my ftp server and I could manually force it to use a certain IP for PASV. Put in the IP of the external USB cable modem and now working all good.

Now I just need to sort out Free Download Manager.. but I'll start another thread about that ;)

Thanks for your help.