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Old 07-02-2004, 01:54 AM   #1
cyber-worx
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Registered: May 2004
Location: England / Switzerland
Distribution: Gentoo, Ubuntu, Debian, Slackware
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Port Forwarding - Help PLEASE


I have a Slackware gateway, which works perfectly well, but i cant get port forwarding (for the use of gnutella etc) to work
Please see the below rc.firewall. The forwarding should be on the bottom line
eth0 is internal if
eth1 is external if

#9.2.2. For iptables Users
echo "***************************rc.firewall******************************"
echo "*******************SWEET AHHHHHHH*****************DUDE AHHHHHHHHH***"
ifconfig eth0 192.168.0.1 up
dhcpcd eth1


#For users connecting to external network on ethernet & using iptables:

# Needed Kernel settings
echo 1 > /proc/sys/net/ipv4/ip_dynaddr
echo 1 > /proc/sys/net/ipv4/ip_forward

# Needed Modules

/sbin/modprobe ipt_MASQUERADE
/sbin/modprobe ipt_state
/sbin/modprobe iptable_mangle
/sbin/modprobe iptable_nat
/sbin/modprobe ip_conntrack
/sbin/modprobe iptable_nat
/sbin/modprobe iptable_filter
/sbin/modprobe ip_tables
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe ip_conntrack_irc

/usr/sbin/iptables -F
/usr/sbin/iptables -t nat -F
/usr/sbin/iptables -t mangle -F #ignore if you get an error here
/usr/sbin/iptables -X #deletes every non-builtin chain in the table

/usr/sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
/usr/sbin/iptables -A INPUT -m state --state NEW -i ! eth1 -j ACCEPT

/usr/sbin/iptables -A FORWARD -i eth1 -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
/usr/sbin/iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT

# use this line only if you have dynamic IP address from your ISP
/usr/sbin/iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

#PORT FORWARDING
/usr/sbin/iptables -A FORWARD -p tcp -i eth1 -d 192.168.0.93 --dport 8436 -j ACCEPT
 
Old 07-02-2004, 02:22 AM   #2
ppuru
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Registered: Mar 2003
Location: Beautiful BC
Distribution: RedHat & clones, Slackware, SuSE, OpenBSD
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Quote:
#PORT FORWARDING
/usr/sbin/iptables -A FORWARD -p tcp -i eth1 -d 192.168.0.93 --dport 8436 -j ACCEPT
to be changed to


/usr/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 8436 -j DNAT --to-destination 192.168.0.93:8436
 
  


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