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Full Discussion: iptables changes
Special Forums IP Networking iptables changes Post 302385319 by rina5392 on Thursday 7th of January 2010 07:49:22 PM
Old 01-07-2010
iptables changes

Hello

We have one linux machine in the office which happens to be an important firewall. I just know the basics and need to make one change

Essentially it is forward mysql traffic to another internal machine.

This is the original rule (forward to 192.20.0.17) which is working


Code:
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 3306 -j allowed
$IPTABLES -t nat -A PREROUTING -p TCP -i $INET_IFACE -d $STATIC_IP --dport 3306 -j DNAT --to-destination 192.20.0.17
$IPTABLES -A FORWARD -p tcp -i $INET_IFACE -o $LAN_IFACE -d 192.20.0.17 --dport 3306 -j allowed


and i just need to send it to 192.20.0.15 so i just change -->

Code:
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 3306 -j allowed
$IPTABLES -t nat -A PREROUTING -p TCP -i $INET_IFACE -d $STATIC_IP --dport 3306 -j DNAT --to-destination 192.20.0.15
$IPTABLES -A FORWARD -p tcp -i $INET_IFACE -o $LAN_IFACE -d 192.20.0.15 --dport 3306 -j allowed

and restart the machine.

But this does not work. is there anything else that must be done ?

The 192.20.0.15 mysql is working as i can get telnet response from it.

Any assistance will be appreciated

Last edited by pludi; 01-08-2010 at 02:20 AM.. Reason: code tags, please...
 

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CHFN(1) 							   User Commands							   CHFN(1)

NAME
chfn - change your finger information SYNOPSIS
chfn [-f full-name] [-o office] ,RB [ -p office-phone] [-h home-phone] -u] [-v] [username] DESCRIPTION
chfn is used to change your finger information. This information is stored in the /etc/passwd file, and is displayed by the finger pro- gram. The Linux finger command will display four pieces of information that can be changed by chfn: your real name, your work room and phone, and your home phone. chfn is used to change local entries only. Use ypchfn, lchfn or any other implementation for non-local entries. COMMAND LINE Any of the four pieces of information can be specified on the command line. If no information is given on the command line, chfn enters interactive mode. INTERACTIVE MODE In interactive mode, chfn will prompt for each field. At a prompt, you can enter the new information, or just press return to leave the field unchanged. Enter the keyword "none" to make the field blank. OPTIONS
-f, --full-name full-name Specify your real name. -o, --office office Specify your office room number. -p, --office-phone office-phone Specify your office phone number. -h, --home-phone home-phone Specify your home phone number. -u, --help Print a usage message and exit. -v, --version Print version information and exit. EXIT STATUS
Returns 0 if operation was successful, 1 if operation failed or command syntax was not valid. SEE ALSO
finger(1), passwd(5) AUTHOR
Salvatore Valente <svalente@mit.edu> AVAILABILITY
The chfn command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux July 2009 CHFN(1)
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