We set up a firewall which in the forward chain looks like:
Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere state RELATED
ACCEPT tcp -- anywhere caro.carocomp.ro tcp dpt:8000
ACCEPT tcp -- 192.168.101.25 anywhere tcp dpt:telnet
ACCEPT tcp -- 192.168.101.24 anywhere tcp dpt:telnet
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:ldap
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:imap
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:rtsp
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:cvspserver
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:cvspserver
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:5190
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:squid
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:https
ACCEPT udp -- 192.168.101.0/24 anywhere udp dpt:domain
ACCEPT udp -- 192.168.101.0/24 anywhere udp dpt:7070
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:7070
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:https
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:5050
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:pop3
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:http
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:domain
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:smtp
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:ssh
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:ftp
ACCEPT tcp -- 192.168.101.0/24 anywhere tcp dpt:ftp-data
DROP tcp -- 192.168.101.0/24 anywhere
so we try to limit the access just to a few accepted services. We are loading the ip_conntrack_ftp and ip_nat_ftp modules:
# lsmod
Module Size Used by Not tainted
ipt_state 1080 1 (autoclean)
cls_u32 6332 2 (autoclean)
sch_cbq 14912 2 (autoclean)
ip_nat_ftp 4240 0 (unused)
ip_conntrack_ftp 5088 0 (unused)
eepro100 22264 1
8139too 17736 1
mii 2156 0 [8139too]
iptable_mangle 2776 1 (autoclean)
ipt_MASQUERADE 2200 0 (autoclean)
ipt_REDIRECT 1368 3 (autoclean)
iptable_nat 19960 2 (autoclean) [ip_nat_ftp ipt_MASQUERADE ipt_REDIRECT]
ip_conntrack 21244 3 (autoclean) [ipt_state ip_nat_ftp ip_conntrack_ftp ipt_MASQUERADE ipt_REDIRECT iptable_nat]
iptable_filter 2412 1 (autoclean)
ip_tables 15224 8 [ipt_state iptable_mangle ipt_MASQUERADE ipt_REDIRECT iptable_nat iptable_filter]
mousedev 5524 0 (unused)
keybdev 2976 0 (unused)
hid 22244 0 (unused)
input 5920 0 [mousedev keybdev hid]
usb-uhci 26188 0 (unused)
usbcore 77024 1 [hid usb-uhci]
ext3 70336 3
jbd 52212 3 [ext3]
sym53c8xx 68240 4
sd_mod 13552 8
scsi_mod 107176 2 [sym53c8xx sd_mod]
but ftp still does not work. :( what is wrong?
Thanks, Laszlo
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