is there a way to discriminate the ESTABLISHED traffic?

Georgi Alexandrov tehlists at hotpop.com
Mon Apr 4 14:11:14 CEST 2005


Guido Lorenzutti wrote:

> Georgi Alexandrov wrote:
>
>> Guido Lorenzutti wrote:
>>
>>> How can i discriminate the traffic that my firewall is answering 
>>> from a NEW request from a network from the ESTABLISHED traffic that 
>>> my firewall is making from a NEW request from him?
>>>
>>> In rules, to allow traffic TO my box from the lan 10.0.0.0/32
>>>
>>> 1 ipt -A INPUT -s 10.0.0.0/32 -m state --state NEW -j ACCEPT
>>> 2 ipt -A INPUT -s 10.0.0.0/32 -m state --state ESTABLISHED -j ACCEPT
>>> 3 ipt -A OUTPUT -d 10.0.0.0/32 -m state --state ESTABLISHED -j ACCEPT
>>>
>>> Now, to allow traffic FROM my box to the lan 10.0.0.0/32
>>>
>>> 4 ipt -A OUTPUT -d 10.0.0.0/32 -m state --state NEW -j ACCEPT
>>> 5 ipt -A OUTPUT -d 10.0.0.0/32 -m state --state ESTABLISHED -j ACCEPT
>>> 6 ipt -A INPUT -s 10.0.0.0/32 -m state --state ESTABLISHED -j ACCEPT
>>>
>>> The 3 and 5 rules are exactly the same. Is there a way to 
>>> discriminate this or the things are just like this and there is 
>>> nothing to do about it?
>>>
>>> Tnxs in advance.
>>>
>>>
>> btw 10.0.0.0/32 ?!
>>
>>
>
> Yeah.. what? I make my 10.0.0.0 subnet a class C :) It's Ok to do 
> that, try it!! :P
>
You probably mean 10.0.0.0/24 then ?

regards,
Georgi Alexandrov



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