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Date:      Tue, 12 Jun 2001 21:11:38 +0200
From:      "Marcel Dijk" <nascar24@home.nl>
To:        <freebsd-security@freebsd.org>
Subject:   IPFW almost works now.
Message-ID:  <01c301c0f374$f3f3c910$0900a8c0@windows>
References:  <200106112347.JAA14067@caligula.anu.edu.au> <3B26177A.ED41EF99@centtech.com>

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Hello,

Thanks to some advice here and http://freebsddiary.org my IPfirewall is
almost how I want it now.

Only to ports I want to be open are open now, and I can access the services
behind these ports. The only problem is FTP. If I try to access the FTP
daemon on port 5617 from for example my work (the FTP daemon runs at home) I
get an error.

I can connect, I have to give my username and pass. It then esstablishes a
connection and tries to execute the LIST command. But then I get this error

_______________________________________
Can't build data connection: interrupted system call.
ABOR command succesfull.
Connection Lost
_______________________________________

If I set the firewall wide-open everything works perfectly, but ofcourse I
don't want a wide open firewall.

I have these IPFW rules defined:

________________________________________
00100 allow ip from any to any via lo0
00200 deny ip from any to 127.0.0.0/8
00220 divert 8668 ip from any to any via ed0
00400 deny ip from 127.0.0.0/8 to any
00615 allow tcp from any to MY_IP 22,5617,10000
00625 allow tcp from MY_IP to any
00650 allow udp from any to MY_IP
00700 allow udp from MY_IP to any
00750 allow icmp from MY_IP to any
00800 allow icmp from any to MY_IP
00850 allow ip from 192.168.0.0/16 to any
00900 allow ip from any to 192.168.0.0/16
65535 deny ip from any to any
________________________________________
(MY_IP is my public/internet IP)

Can anyone give me some advice on what the problem is and how I can solve
it. Just a reminder: all the other services work perfectly with this FW
configuration.

Marcel


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