[Snort-users] Newbie question: reject rule for IPv6

K b urbestfriend at ...11827...
Sun Dec 11 05:39:15 EST 2011


I am using following command to start snort.

snort -c  /etc/snort.conf -N -D

Also I have set following parameters in snort.conf.

config daq: nfq
config daq_mode: inline
config daq_var: proto=ip6
config daq_dir:<dir>

Note that I have built both daq and snort with --ipv6-enabled option.

My ip6table:

-A INPUT -d <ip_address>/128 -p tcp -m tcp --dport 80 -j NFQUEUE --queue-num 0

The setup  works fine as I am seeing alerts getting logged when I send
a http request with URI contains "snort-test", but unfortunately the
request is not getting rejected ( No ICMP6 unreachable ) as it
should've been and request is going through.

In fact I tried 'drop' too , without any success. Can someone point
out the code where ICMP unreachable is sent ? I tried to debug daq and
always verdict to NFQUEUE is set as NF_ACCEPT.

Thanks for the response.


On Sat, Dec 10, 2011 at 9:16 PM, JJ Cummings <cummingsj at ...11827...> wrote:
> What does your iptables look like and what is your snort startup command line? Also, use drop, not reject.
> Sent from the iRoad
> On Dec 9, 2011, at 5:48, K b <urbestfriend at ...11827...> wrote:
>> Hello,
>> A newbie here and I was trying to setup snort inline with NFQ for IPv6
>> services.  Just for testing I have added the following reject rule.
>> reject tcp any any -> any 80 (classtype:attempted-user;
>> msg:"Snort_test"; content:"snort-test"; sid:9000001; rev:1;)
>> Now If I send a traffic with the above content, I see that alerts are
>> getting generated but this requests is not being reset as expected.
>> I am running snort, my snort.conf is unchanged. What am I doing wrong?
>> Have a good day.
>> Thanks and regards,
>> Kumar
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