Re: IPv6: unknown packet logged ...

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On Tue, August 22, 2017 16:47, Mark Coetser wrote:
> On 22/08/2017 16:42, Walter H. wrote:
>> Hello,
>>
>> I have these rules at the beginning of /etc/sysconfig/ip6tables
>>
>> # Filter all packets with state INVALID
>> -A INPUT -m state --state INVALID -j DROP
>> -A FORWARD -m state --state INVALID -j DROP
>> -A OUTPUT -m state --state INVALID -j DROP
>>
>> and on bottom these rules:
>>
>> # Log all other
>> -A INPUT -j LOG --log-prefix "IPv6[IN]: " --log-level 7
>> -A FORWARD -j LOG --log-prefix "IPv6[FWD]: " --log-level 7
>> -A OUTPUT -j LOG --log-prefix "IPv6[OUT]: " --log-level 7
>>
>> which rule would have catched these logged packets:
>>
>> [70223.386265] IPv6[FWD]: IN=sit1 OUT=br0
>> SRC=2a00:1450:4001:081a:0000:0000:0000:200e DST=myipv6addr LEN=123 TC=0
>> HOPLIMIT=60 FLOWLBL=617912 PROTO=TCP SPT=443 DPT=59073 WINDOW=1171
>> RES=0x00 ACK PSH URGP=0
>> [70232.150311] IPv6[FWD]: IN=sit1 OUT=br0
>> SRC=2a00:1450:4001:081a:0000:0000:0000:200e DST=myipv6addr LEN=123 TC=0
>> HOPLIMIT=60 FLOWLBL=949795 PROTO=TCP SPT=443 DPT=59073 WINDOW=1171
>> RES=0x00 ACK PSH URGP=0
>> [70249.740932] IPv6[FWD]: IN=sit1 OUT=br0
>> SRC=2a00:1450:4001:081a:0000:0000:0000:200e DST=myipv6addr LEN=123 TC=0
>> HOPLIMIT=60 FLOWLBL=811062 PROTO=TCP SPT=443 DPT=59073 WINDOW=1171
>> RES=0x00 ACK PSH URGP=0
>
> those logged packets are from packets traversing your filter FORWARD
> chain obviously no rule is matching which is why its triggering the last
> rule which is
>
> -A FORWARD -j LOG --log-prefix "IPv6[FWD]: " --log-level 7
>
of course, and which rule would I have to add bevor this rule, so that
these are not logged ...?


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