Re: strange log on gateway inside []

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On Thursday 2010-07-29 11:18, Michele Petrazzo - Unipex wrote:

>Jan Engelhardt ha scritto:
>>>My output chain:
>>>*filter
>>>:OUTPUT DROP [4831251:620928037]
>>>-A OUTPUT -o lo -j ACCEPT
>>>-A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
>>>-A OUTPUT -j LOG --log-prefix "Firewall DROPOUT- "
>>
>>So what's left is INVALID packets.
>
>Seem that a rule that drop the INVALID packets to the trick. But... 
>drop or reject the invalid packets?

Whatever fits your need.

>>>The question. Why I see this log and why my fw want to talk with 
>>>external and, the last, why the kernel double log talk and one is 
>>>inside the brackets [ ]?
>>
>>Because those are the contents of the ICMP packet. See the RFC.
>
>Append also with tcp, no only icmp.
>P.s. Have you a rfc number?

792

>And the last, have you also an rfc that explain why and where invalid 
>come from?

INVALID is a CT classification. RFC don't have much to do with that.
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