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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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LEARN ABOUT DEBIAN

shaperd

shaperd(8)						      System Manager's Manual							shaperd(8)

NAME

       shaperd - traffic shaper for tcp-ip networks

SYNOPSIS

       shaperd [-h] [-v] [-c file ]

DESCRIPTION

       shaperd is a user-mode program that can shape traffic passing through a linux box. As it runs as a normal daemon process, packet forwarding
       to/from the kernel can be done by the BSD divert sockets layer (available as a patch for the linux kernel) or by the ipq packet	forwarding
       library that comes with kernel 2.4.

       The  configuration  is  made  via  a  single text file, you can force a reload by sending a SIGHUP. Logs are routed via syslog, with prior-
       ity=info, facility=daemon.

       Please note that, for the moment, you must instruct the kernel which packets to forward to shaperd.  This can be done,  for  example,  with
       the  ipchains(8)  utility under Linux 2.2, or with iptables(8) under Linux 2.4. Also, note that if a packet does not match any of the rules
       in the configuration file, it will be ignored by shaperd (but it will be logged if the log level is high enough).

OPTIONS

       -c config-file
	      Tells the daemon to get its configuration from this config-file

       -h     Summarizes command line options

       -v     Prints version information

SEE ALSO

       ipchains(8);  iptables(8);  libipq(3);  Linux's	divert	sockets  site,	http://www.anr.mcnc.org/~divert/index.shtml  ;	Netfilter's  site,
       http://netfilter.samba.org. Linux Advanced Routing & Traffic Control, http://ds9a.nl/lartc.

BUGS

       do i kill them? become their friend?
       do i eat them? raw or well done
       do i trick them? i ... i don't think they're that dumb
       do i join them? looks like that's the one
       i got bugs on my skin tickle my nausea
       i let it happen again they're always taking over
       i see they surround me i see ... see them deciding my fate
       oh that which was once was once up to me ... now it's too late
       i got bugs in my room one on one
       that's when i had a chance
       i'll just stop now i'll become naked, and with them i'll become one

AUTHOR

       Leandro Santi <lsanti@fi.uba.ar>

																	shaperd(8)
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