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01.30.2004 at 01:47PM PST, ID: 20868503
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7.8

Client FTP through Netmax behind PIX515E

Asked by jgilligan1 in Network Software Firewalls

Tags: , ,

Hello Everybody,

I've got a question which is a little involved but hopefully not too much. I'm something of a newbie at firewall setup but have got a question which is hopefully relatively simple.

Problem : We're looking to have a small group of win2k users who would like to FTP directly from their workstations to a Fedex Server on the internet (directlink) [personally I'm not crazy about allowing passive ftp through our pix but the users pay the bills.

Our network is laid out with the users going through a legacy netmax Prosuite proxy for HTTP proxy traffic.

I'm trying to enable passive FTP for our clients but I'm running into the following issue.

The netmax/proxy is behind a pix 515.

I've been working with the netmax folks who basically have provided some simple rules for (essentially a thinly masked version of
IPtables) which seem like they "should work" but our PIX allows only for only http (port 80) and https (port 443) traffic

part of the pix 515 instructions which seem applicable are

25.30.15.* address of sub-domain to world
25.30.15.55 - address of our netmax server to world.

fixup protocol 21
fixup protocol 80
fixup protocol 25
fixup protocol 443

access-list inbound permit tcp any 25.30.15.0 255.255.255.0 eq 80
access-list inbound permit tcp any 25.30.15.0 255.255.255.0 eq 443

But I believe that I need to open up many ports (read 20,21 and >1024) on the ip address where our netmax attaches directly to the pix.

I'm thinking that something like this might work to allow the netmax to work (if it's going to work at all) I'm thinking I need to open ports 20 & 21 and also allow most - if not all ports above 1024 - I'd be relying on the netmax to handle bad traffic above 1024 and I'm certain some exclusions could be included in here but basically I'm curious if this is it.

access-list inbound permit tcp any host 25.30.15.55 eq 20:21
access-list inbound permit tcp any host 25.30.15.55 eq 1024:65535

Please let me know if I need to provide more information or if anyone has had the distinction of doing this sort of thing in the past, any help would be greatly appreciated.

Thanks,

Joe G.Start Free Trial
 
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[+][-]01.31.2004 at 07:57AM PST, ID: 10242472

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About this solution

Zone: Network Software Firewalls
Tags: ftp, passive, pix
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Solution Provided By: tim_holman
Participating Experts: 2
Solution Grade: A
 
 
 
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