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On 01/18/2017 07:01 AM, Nigel Aves wrote:
> I've become a little stuck on setting up ipset correctly.  I
> followed the instructions from an email as follows:
> 
> 
> DYNAMIC_BLACKLIST=ipset-only,timeout=3600::info
> 
> and in Rules at end
> 
> ADD(SW_DBL4:src)    net    $FW
> 
> and after some testing  everything seemed to be working all OK.
> Using Shorewall  5.0.14.1
> 
> I have port 80 (web server) and 25 (Postfix server) open in my
> Rules file. Internal network using 192.168.1.1 on eth1
> 
> But as soon as I tried using the browser on my local network
> machine web sites, like Facebook, just stopped working.
> 
> I've tried to find a simple (I'm no IT specialist, just home
> hobbyist) explanation as to what I have done wrong or missed,  and
> seemed to have hit a brick wall.
> 
> If someone could point me in right direction I would be very
> gratefully.
> 
> Kind Regards, Nigel Aves.
> 
> 
> In case it helps, here is my rules file.
> 
> DHCPfwd/ACCEPT    loc    fw # # DHCPfwd/ACCEPT    $FW    loc # #
> Accept for web -server ACCEPT    net    $FW        tcp    80 # no
> ssl #  ACCEPT    net    $FW           tcp    443 # # # Turn FTP off
> when not transfering files from VideoKing # #  FTP/ACCEPT    net
> fw    -    21 #  ACCEPT    net    $FW    tcp    6000:6100 # ######
> use Webmin while away, turn off when returned. Here is the setting 
> # Don't forget to turn on for trips. # # ACCEPT    net    $FW
> tcp    1xxxx # # SMTP/ACCEPT    net    $FW    -    25 # DNS(ACCEPT)
> $FW        net #    Accept DNS connections from the firewall to the
> network # SSH(ACCEPT)    loc        $FW # #    Accept SSH
> connections from the local network for administration # 
> Ping(ACCEPT)    loc        $FW # #    Allow Ping from the local
> network # # ## Internal accepts # #Cable TV forward DNAT    net
> loc:192.168.1.180    udp    27177 DNAT    net    loc:192.168.1.180
> udp    27178 DNAT    net    loc:192.168.1.180    tcp    27177 DNAT
> net    loc:192.168.1.180    tcp    27178 # ACCEPT             loc
> $FW          tcp ACCEPT             loc        $FW          udp # 
> DNS(ACCEPT)      loc        $FW SMB(ACCEPT)      loc        $FW 
> SMB(ACCEPT)      $FW        loc # DNS(ACCEPT)      phone
> $FW # # Drop Ping from the "bad" net zone.. and prevent your log
> from being flooded.. # Ping(DROP)    net        $FW ACCEPT
> $FW        loc        icmp ACCEPT        $FW        net
> icmp # ACCEPT        $FW        phone        icmp # # turn on ipset
> to stop testing ports from outside # # ADD(SW_DBL4:src)    net
> $FW
> 

I suspect that you are blacklisting the upstream DNS name servers.

Try this:

#
# Filter out noise
#
Drop    net     $FW
#
# turn on ipset to stop testing ports from outside
#
ADD(SW_DBL4:src):info   net     $FW

- -Tom
- -- 
Tom Eastep        \ When I die, I want to go like my Grandfather who
Shoreline,         \ died peacefully in his sleep. Not screaming like
Washington, USA     \ all of the passengers in his car
http://shorewall.net \________________________________________________
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