[WBEL-users] Iptables Not Working

[Bill Davidsen]

Ed Morrison wrote:
> Hi Everyone,
> 
> I'm having a problem with my iptables not working.  Below is my iptables
> file.  If someone could show me what it is I am doing wrong I would
> surely appreciate it.  This is running on WBEL 3.0 and it is my mail
> server.  I have spammers sending directly to it and need to drop those
> packets....

I highly suggest putting your rules in a script so you can run them and 
see what they are really doing one rule at a time, but that's just for 
ease of debugging, as in "bash -xv firewall.cfg" is often very useful.

Other comments on general style, the ESTABLISHED rule should be the very 
first thing in the INPUT chain, because it is the most often matched. On 
a busy system this will make a visible difference in system time.

It's faster and easier to understand if you set up a table to validate 
your tcp --syn packets, and just jump to that with a single rule if it's 
a SYN packet. It's safer to set policy on INPUT to DROP, then allow only 
what you really must have. Putting your icmp packets in a table makes 
this easy to understand as well.

Finally, it looks as if you may have chains rather than tables loaded, 
that may or may not be as issue, I assume the tables module gets demand 
loaded eventually.

I think you have some syntax error, without COMMIT it does nothing, 
which explains your other problem. Hope this helps.
> 
> *filter
> :INPUT ACCEPT [0:0]
> :FORWARD ACCEPT [0:0]
> :OUTPUT ACCEPT [0:0]
> -A INPUT -i lo  -j ACCEPT
> -A INPUT -s 24.20.253.108 -j DROP
> -A INPUT -s 69.145.105.154 -j DROP
> -A INPUT -s 4.11.196.79 -j DROP
> -A INPUT -s 80.202.20.7 -j DROP
> -A INPUT -s 137.164.158.14 -j DROP
> -A INPUT -s 201.129.85.142 -j DROP
> -A INPUT -s 24.19.7.146 -j DROP
> -A INPUT -s 66.44.140.103 -j DROP
> -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
> -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
> -A INPUT -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT
> -A INPUT -m state --state NEW -m tcp -p tcp --dport 106 -j ACCEPT
> -A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT
> -A INPUT -m state --state NEW -m tcp -p tcp --dport 995 -j ACCEPT
> -A INPUT -m state --state NEW -m tcp -p udp --dport 995 -j ACCEPT
> -A INPUT -j REJECT --reject-with icmp-host-prohibited
> COMMIT
> 
> 
> If I run: service iptables start I receive this error:
> 
> # service iptables start
> Flushing firewall rules: [  OK  ]
> Setting chains to policy ACCEPT: filter [  OK  ]
> Unloading iptables modules: [  OK  ]
> Applying iptables firewall rules: iptables-restore: line 23 failed
> [FAILED]
> 
> It doesn't like the COMMIT line.  
> 
> If I remove the COMMIT.  I see this when start iptables:
>  
> # service iptables start
> Flushing firewall rules: [  OK  ]
> Setting chains to policy ACCEPT: filter [  OK  ]
> Unloading iptables modules: [  OK  ]
> Applying iptables firewall rules: [  OK  ]
> 
> 
> 
> And yet when I run: iptables -L -v   to verify that the tables loaded
> none of the rules show up:
> 
> Chain INPUT (policy ACCEPT 1753 packets, 296K bytes)
>  pkts bytes target     prot opt in     out     source     destination
> 
> 
> Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
>  pkts bytes target     prot opt in     out     source     destination
> 
> 
> Chain OUTPUT (policy ACCEPT 1820 packets, 293K bytes)
>  pkts bytes target     prot opt in     out     source     destination
> 
> 
> 
> 
> 
> 
> 
> 
> 
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-- 
    -bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
  last possible moment - but no longer"  -me