Re: [bitfolk] Strange DDOS attack?

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Author: Graham Bleach
Date:  
To: Bitfolk Users
Subject: Re: [bitfolk] Strange DDOS attack?
On Tue, Dec 31, 2013 at 12:18 AM, Tony Andersson
<BitFolkList@???> wrote:
> Realised the second after I pressed the send button that the answer to
> the ban issue is because those attacks are on ip v6
>
> root@bitfolk:/etc/fail2ban# netstat -n
> Active Internet connections (w/o servers)
> Proto Recv-Q Send-Q Local Address           Foreign Address         State
> tcp6       0      1 85.119.82.79:80         121.168.45.218:1446     FIN_WAIT1
> tcp6       0      1 85.119.82.79:80         24.186.158.213:61301    FIN_WAIT1
> tcp6       0      1 85.119.82.79:80         67.180.245.251:17277    FIN_WAIT1
> tcp6       0      1 85.119.82.79:80         71.218.243.152:25311    FIN_WAIT1


Those are IPv4 addresses, they should be firewalled by iptables as usual.

I think this happens when a service binds a socket to both ipv4 and
ipv6: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=453272

Cheers,
Graham