Date: 9 May 2001 09:05:00 -0700 From: Michael Sharp <msharp@medmail.com> To: FreeBSD-security@FreeBSD.org Subject: Ip filtering with ipfw Message-ID: <20010509160500.7232.cpmta@c000.sfo.cp.net>
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I am very new to FreeBSD, and have some questions about ipfw I compiled: options IPFIREWALL into my kernel, and added: firewall_enable="YES" in /etc/rc.conf on reboot, I see ipfiltering initializing and the default policy is to deny. After reboot, I do: ipfw list and get this: 00100 allow ip from any to any via lo0 00200 deny ip from any to 127.0.0.0/8 00300 deny ip from 127.0.0.0/8 to any 65000 allow ip from any to any 65535 deny ip from any to any which I am assuming is the defaults. Now, to keep it simple, I have a router between my internal machine ( 192.168.1.3 ) and the Internet and I set the router to allow only port 113 in to 192.168.1.3 ifconfig reveals that my ethernet card is on x10 I added to ipfw: ipfw add allow tcp from 199.163.7.34 to 192.168.1.3 in via x10 ipfw add deny all from any to 192.168.1.3 0-1023 in via x10 199.163.7.34 is the ip of a DALnet IRC server that checks identd My thinking here was I only wanted 199.163.7.34 to get a identd responce on 113 and block all the others from getting a responce on 113. However, all the OTHER DALnet servers are getting a responce from 113 ( not just 199.163.7.34 ) and when I ran nmap from a friends box, it showed 113 open. What am I missing? ------------------------------------------------------- Get your free, secure email at http://www.medmail.com - the e-mail service for the medical community To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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