RE: SMTP HTTP port allow

[ads nat <adsnat@yahoo.com>]

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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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