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Standard FTP in private network

Hi!

I'm trying to config ASL 3.202 so that I can run a FTP server in my private network to be accessable from the "outside".

FTP server IP:   192.168.1.1
ASL internal IP: 192.168.1.254
ASL external IP: 130.83.19.167
masq private LAN on WAN-Interface

First I added a packet filter rule:
All/All -> WAN_Interface/FTP : allow

Then I added a S-/DNAT rule:
All -> WAN_Interface SRCTransl.:none DSTTransl.: FTPserverIP

But (as I assuemed) I doesn't work.   [:(]
Do I have to allow FTP-Control separatley and add another S-/DNAT Rule?   [:S]

Tkx in advance.
Greetings
Chris

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Parents

0 Andy_01 over 23 years ago

your packet filter rule is wrong, it has to be Any->ftp->FTP Server->allow, DNAT is done before the packet filtering, the packet filter sees the translated address.
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0 DerChris over 23 years ago in reply to Andy_01

Tkx.
Good to know.
But it still doesn't work. :-/
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0 Andy_01 over 23 years ago in reply to DerChris

check the default gateway of the ftp server, has to be the internal interface of the Astaro.
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0 DerChris over 23 years ago in reply to Andy_01

The GW is configured correctly.
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0 oliver.desch over 23 years ago in reply to DerChris

f3@Rl3SS,

have a look at the packet filter log to find out
what is being filtered!

read you
o|iver
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0 DerChris over 23 years ago in reply to oliver.desch

Hmmmm ...
none of the FTP connections I tried to establish are filteres. So ... packet filtering seems to work correctly ...
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0 AKo over 23 years ago in reply to DerChris

Hi,

u set:
Then I added a S-/DNAT rule:
All -> WAN_Interface SRCTransl.:none DSTTransl.: FTPserverIP

I think, this is wrong!? try this: S/DNAT 2FTP

match parameters | src trans | dst trans
any --> WAN_Interface_/FTP --> none ----> ftpserver

rule filter must set to
any | ftp | ftpserver | allow

it runs!(?)
bye
ak
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0 DerChris over 23 years ago in reply to AKo

I allready noticed that failure and fixed it. But it still does not work. [:(]

PS: I got the same problem with all forwarded ports. UT Server, CUSeeMe, etc. ...

[size="1"][ 12 August 2002, 11:13: Message edited by: f3@Rl3SS ][/size]
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0 DerChris over 23 years ago in reply to DerChris

Doesn't anyone know that problem?
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0 Simon Shaw over 23 years ago in reply to DerChris

Try setting a NAT rule ANY/ANY > ftp server IP
Try setting packet rule for ANY packets to anywhere to go through.

People should use PASV mode to connect to the ftpd.

It should work, I've set this up, I'd show you the config but our ISP for that box just collapsed !
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0 Simon Shaw over 23 years ago in reply to DerChris

Try setting a NAT rule ANY/ANY > ftp server IP
Try setting packet rule for ANY packets to anywhere to go through.

People should use PASV mode to connect to the ftpd.

It should work, I've set this up, I'd show you the config but our ISP for that box just collapsed !
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Children

0 DerChris over 23 years ago in reply to Simon Shaw

Hmmm ...
But in that case I wouldn't need a Firewall anymore! [:(]
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0 Simon Shaw over 23 years ago in reply to DerChris

Get it working first then tighten it.
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0 DerChris over 23 years ago in reply to Simon Shaw

Hmmmm ... I really can't believe it ...
I did what you say, but its still not working.

At the moment, there is one packetfilter rule:
any -> any -> any : allow

I'm masquerading my private network on ASLs WAN-NIC and there is one DNAT rule:

All -> myExternalIP/Any | noSrcTrans | DestTrans: myFTPServer

What am I doing wrong???

[size="1"][ 16 August 2002, 07:50: Message edited by: f3@Rl3SS ][/size]
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0 DerChris over 23 years ago in reply to DerChris

ops ... my failure ...
It works with that konfig. (no wonder)

If I enable the packet filtering rules, it doesn't.
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0 DerChris over 23 years ago in reply to DerChris

OK ... I found the "bad boy".
It was a filter rule:
Any/Any -> myLAN : DROP

But isn't disabeling that rule insecure?
(i still got the rule: Any/Any -> WAN_Interface_ : DROP )
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0 Simon Shaw over 23 years ago in reply to DerChris

By default Astaro denies traffic unless you explicitly allow it.
Rules are also processed in order of their listing. You can play with the rules and come up with good security whilst still allowing your ftpd to run.
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