On September 5, 2004 10:31 am, Steve Turnbull wrote:
Hi
Our web server is configured;
Debian (Woody) (No X installed)
Kernel 2.4.23 - configured with iptables in mind
iptables v1.2.6a
When we start the firewall script, we get this message;
'No chain/target/match by that name'
urmm ... try rebuilding iptables code against this kernel?
I'm not sure about Debian's packages, but is it possible that the iptables
code is precompiled here?
The firewall works however, but is constantly logging;
'Sep 5 16:00:52 www kernel: Input: IN=eth0 OUT=
MAC=00:e0:81:29:01:75:00:07:85:06:c2:e1:08:00 SRC=195.92.195.93
DST=195.92.38.54 LEN=302 TOS=0x00 PREC=0x00 TTL=61 ID=0 DF PROTO=UDP
SPT=53 DPT=32833 LEN=282'
This looks like a reply to a DNS query. It the state rule below didn't get
accepted this looks correct.
Something is ammis here, and we can't ping out from the server with the
firewall running, also, we can't use Lynx to browse. Turn the firewall
off and all is well for both of these.
You haven't included any rules here that regard ICMP -- no pings.
Has anybody got any ideas what is wrong? Our firewall rule is below.
Regards
Steve
#!/bin/sh
#
# This is the firewall up script.
#
#
# Lets start by dropping all incoming traffic and allowing all
# outbound traffic
#
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT
# Flush any existing rules...
iptables -F
# Allow any established connections to come on through...
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# This is a web server. We only require access to http ports
# 80,21,53 and 443. New ports to allow will be added here...
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
#ssh
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
#ftp
iptables -A INPUT -p tcp --dport 21 -j ACCEPT
#DNS
iptables -A INPUT -p tcp --dport 53 -j ACCEPT
iptables -A INPUT -p udp --dport 53 -j ACCEPT
# Allow the loopback connection...
iptables -A INPUT -i lo -j ACCEPT
# Log stuff that doesn't match above rules...
iptables -A INPUT -j LOG --log-prefix="Input: "
