From mboxrd@z Thu Jan 1 00:00:00 1970 From: ads nat Subject: RE: SMTP HTTP port allow Date: Wed, 27 Aug 2003 04:49:58 -0700 (PDT) Sender: netfilter-admin@lists.netfilter.org Message-ID: <20030827114958.60579.qmail@web20704.mail.yahoo.com> References: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1125703825-1061984998=:56268" Return-path: In-Reply-To: Errors-To: netfilter-admin@lists.netfilter.org List-Help: List-Post: List-Subscribe: , List-Id: List-Unsubscribe: , List-Archive: To: George Vieira , netfilter@lists.netfilter.org --0-1125703825-1061984998=:56268 Content-Type: text/plain; charset=us-ascii My code has become as follows : ****** iptables -A POSTROUTING -t nat -p tcp --dport 25 -j MASQUERADE iptables -A POSTROUTING -t nat -p tcp -s 192.168.0.42 -d 207.106.22.35 --dport 21 -j MASQUERADE iptables -A POSTROUTING -t nat -p tcp -s 192.168.0.23 -d 207.106.22.35 --dport 21 -j MASQUERADE iptables -t nat -A PREROUTING -p TCP --dport 80 -j REDIRECT --to-port 3128 ***** Is this O.K. Thanks George Vieira wrote: You have not used MASQUERADE in your POSTROUTING rules or haven't showed it.. iptables -A POSTROUTING -t nat -p tcp -s 192.168.0.42 -d 207.106.22.35 --dport 80 -j MASQUERADE iptables -A POSTROUTING -t nat -p tcp -s 192.168.0.23 -d 207.106.22.35 --dport 80 -j MASQUERADE without the rules above, the 192.168.0.XX packets leave the network out into the internet and eventually get dropped by some ISP... -----Original Message----- From: netfilter-admin@lists.netfilter.org [mailto:netfilter-admin@lists.netfilter.org]On Behalf Of ads nat Sent: Wednesday, August 27, 2003 4:53 PM To: netfilter@lists.netfilter.org Subject: SMTP HTTP port allow I am implimenting iptables for first time. I want to allow all my LAN users to send emails to SMTP (port no. 25) all destination with following code. : *** iptables -A FORWARD -p tcp --dport 25 -j ACCEPT *** I also want to allow LAN users having ip 192.168.0.42 192.168.0.23 to upload contents to webserver on ip 207.106.22.35 (outside of LAN) with following code. *** iptables -A FORWARD -p tcp -s 192.168.0.42 192.168.0.23 -d 207.106.22.35 --dport 80 -j ACCEPT *** I would loke know whether It works or not. Tell me whether my code is O.K. also where can i check logs. Thanks --------------------------------- Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software --------------------------------- Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software --0-1125703825-1061984998=:56268 Content-Type: text/html; charset=us-ascii
My code has become as follows :
 
******
iptables -A POSTROUTING -t nat -p tcp --dport 25 -j MASQUERADE

iptables -A POSTROUTING -t nat -p tcp -s 192.168.0.42 -d 207.106.22.35 --dport 21 -j MASQUERADE
iptables -A POSTROUTING -t nat -p tcp -s 192.168.0.23 -d 207.106.22.35 --dport 21 -j MASQUERADE

iptables -t nat -A PREROUTING -p TCP --dport 80 -j REDIRECT --to-port 3128
*****
Is this O.K.
Thanks

George Vieira <georgev@citadelcomputer.com.au> wrote:
You have not used MASQUERADE in your POSTROUTING rules or haven't showed it..
 
iptables -A POSTROUTING -t nat -p tcp -s 192.168.0.42 -d 207.106.22.35 --dport 80 -j MASQUERADE
iptables -A POSTROUTING -t nat -p tcp -s 192.168.0.23 -d 207.106.22.35 --dport 80 -j MASQUERADE
 
 
without the rules above, the 192.168.0.XX packets leave the network out into the internet and eventually get dropped by some ISP...
 
-----Original Message-----
From: netfilter-admin@lists.netfilter.org [mailto:netfilter-admin@lists.netfilter.org]On Behalf Of ads nat
Sent: Wednesday, August 27, 2003 4:53 PM
To: netfilter@lists.netfilter.org
Subject: SMTP HTTP port allow

I am implimenting iptables for first time.
I want to allow all my LAN users to send emails to SMTP (port no. 25) all destination with following code. :
 
***
iptables -A FORWARD -p tcp --dport 25 -j ACCEPT
***
 
I also want to allow LAN users having ip 192.168.0.42 192.168.0.23 to upload contents to webserver on ip 207.106.22.35 (outside of LAN) with following code.
 
***
iptables -A FORWARD -p tcp -s 192.168.0.42 192.168.0.23 -d 207.106.22.35 --dport 80 -j ACCEPT
***
 
I would loke know whether It works or not.
Tell me whether my code is O.K. also where can i check logs.
Thanks

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