03-20-2002
For those who want to know, here is the iptables rule to block ftp connection requests from one side, and allow the request from the other:
# ftp control connection
iptables -A FORWARD -i eth1 -o eth0 -p TCP --sport 1024:65535 --dport ftp -j ACCEPT
iptables -A FORWARD -i eth0 -o eth1 -p TCP ! --syn --sport ftp --dport 1024:65535 -j ACCEPT
! --syn
Means, there's no connection request. Therefore, the packet can continue it's way through the firewall.
Just in case somebody wants to know.
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iptables action in tc(8) Linux iptables action in tc(8)
NAME
xt - tc iptables action
SYNOPSIS
tc ... action xt -j TARGET [ TARGET_OPTS ]
DESCRIPTION
The xt action allows to call arbitrary iptables targets for packets matching the filter this action is attached to.
OPTIONS
-j TARGET [ TARGET_OPTS ]
Perform a jump to the given iptables target, optionally passing any target specific options in TARGET_OPTS.
EXAMPLES
The following will attach a u32 filter to the ingress qdisc matching ICMP replies and using the xt action to make the kernel yell 'PONG'
each time:
tc qdisc add dev eth0 ingress
tc filter add dev eth0 parent ffff: proto ip u32
match ip protocol 1 0xff
match ip icmp_type 0 0xff
action xt -j LOG --log-prefix PONG
SEE ALSO
tc(8), tc-u32(8), iptables-extensions(8)
iproute2 3 Mar 2016 iptables action in tc(8)