[Cerowrt-devel] How to close default open firewall ports in 3.3.8

[Cerowrt-devel] How to close default open firewall ports in 3.3.8

[Shannon Kendrick]

What's the best resource for learning how to configure the firewall to close the ports that are open by default?  I installed 3.3.8-26 "sugarland" into a brand new WNDR3800 to be used as my home router, and I immediately ran ShieldsUp!! (grc.com) and noticed open ports.  However, I'm at a loss as to how to close them.
Thanks,
Shannon Kendrick

Re: [Cerowrt-devel] How to close default open firewall ports in 3.3.8

[Dave Taht]

Several ports are open, but filtered, using various means. Does this
tool not show filtered?

For example, rsync and ssh are enabled but the default settings in
/etc/xinetd.conf prohibit access via any but your internal private
ips.

Telnet and ftp ports (not services) are enabled, but are there to
trigger sensors to disable other services in the advent of an attack
from inside or outside of your firewall.

You can close ports more fully to the outside world via the gui,
editing /etc/config/firewall and/or do finer grained access control
via /etc/xinetd.conf and /etc/xinetd.d/

The web port (80) defaults open, the web configuration port (81) does
not. The intent here is to enable you to put up your own local web
pages.

See the onboard and wiki documentation for more details.

Thx for trying cerowrt!

On Wed, Oct 10, 2012 at 8:44 AM, Shannon Kendrick
<shannon@kendrickonline.org> wrote:
> What's the best resource for learning how to configure the firewall to close the ports that are open by default?  I installed 3.3.8-26 "sugarland" into a brand new WNDR3800 to be used as my home router, and I immediately ran ShieldsUp!! (grc.com) and noticed open ports.  However, I'm at a loss as to how to close them.
> Thanks,
> Shannon Kendrick
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel



-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html

Re: [Cerowrt-devel] How to close default open firewall ports in 3.3.8

[Maciej Soltysiak]

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This looks like an FAQ item :-) I'll have a look at the wiki.
On Oct 10, 2012 7:22 PM, "Dave Taht" <dave.taht@gmail.com> wrote:

> Several ports are open, but filtered, using various means. Does this
> tool not show filtered?
>
> For example, rsync and ssh are enabled but the default settings in
> /etc/xinetd.conf prohibit access via any but your internal private
> ips.
>
> Telnet and ftp ports (not services) are enabled, but are there to
> trigger sensors to disable other services in the advent of an attack
> from inside or outside of your firewall.
>
> You can close ports more fully to the outside world via the gui,
> editing /etc/config/firewall and/or do finer grained access control
> via /etc/xinetd.conf and /etc/xinetd.d/
>
> The web port (80) defaults open, the web configuration port (81) does
> not. The intent here is to enable you to put up your own local web
> pages.
>
> See the onboard and wiki documentation for more details.
>
> Thx for trying cerowrt!
>
> On Wed, Oct 10, 2012 at 8:44 AM, Shannon Kendrick
> <shannon@kendrickonline.org> wrote:
> > What's the best resource for learning how to configure the firewall to
> close the ports that are open by default?  I installed 3.3.8-26 "sugarland"
> into a brand new WNDR3800 to be used as my home router, and I immediately
> ran ShieldsUp!! (grc.com) and noticed open ports.  However, I'm at a loss
> as to how to close them.
> > Thanks,
> > Shannon Kendrick
> > _______________________________________________
> > Cerowrt-devel mailing list
> > Cerowrt-devel@lists.bufferbloat.net
> > https://lists.bufferbloat.net/listinfo/cerowrt-devel
>
>
>
> --
> Dave Täht
>
> Fixing bufferbloat with cerowrt:
> http://www.teklibre.com/cerowrt/subscribe.html
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel
>

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Re: [Cerowrt-devel] How to close default open firewall ports in 3.3.8

[Shannon Kendrick]

I'm still struggling to understand the firewall configuration. My goal is to use CeroWRT (with Codel) as my primary router, and I'm not comfortable having any ports open to the WAN even if they are filtered.  I'm using the free ShieldsUP!! port scanner hosted at grc.com to check for open ports. I would be nice if someone with expertise on the firewall rules could add to the wiki, or better yet a video on youtube that describes how to configure the rules.
Thanks
Shannon Kendrick

On Oct 10, 2012, at 1:22 PM, Dave Taht wrote:

> Several ports are open, but filtered, using various means. Does this
> tool not show filtered?
> 
> For example, rsync and ssh are enabled but the default settings in
> /etc/xinetd.conf prohibit access via any but your internal private
> ips.
> 
> Telnet and ftp ports (not services) are enabled, but are there to
> trigger sensors to disable other services in the advent of an attack
> from inside or outside of your firewall.
> 
> You can close ports more fully to the outside world via the gui,
> editing /etc/config/firewall and/or do finer grained access control
> via /etc/xinetd.conf and /etc/xinetd.d/
> 
> The web port (80) defaults open, the web configuration port (81) does
> not. The intent here is to enable you to put up your own local web
> pages.
> 
> See the onboard and wiki documentation for more details.
> 
> Thx for trying cerowrt!
> 
> On Wed, Oct 10, 2012 at 8:44 AM, Shannon Kendrick
> <shannon@kendrickonline.org> wrote:
>> What's the best resource for learning how to configure the firewall to close the ports that are open by default?  I installed 3.3.8-26 "sugarland" into a brand new WNDR3800 to be used as my home router, and I immediately ran ShieldsUp!! (grc.com) and noticed open ports.  However, I'm at a loss as to how to close them.
>> Thanks,
>> Shannon Kendrick
>> _______________________________________________
>> Cerowrt-devel mailing list
>> Cerowrt-devel@lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/cerowrt-devel
> 
> 
> 
> -- 
> Dave Täht
> 
> Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html

Re: [Cerowrt-devel] How to close default open firewall ports in 3.3.8

[Kai Yang]

Hi,

It is simple with the web interface. In Firewall, General Settings tab
look for the zone section. In that section, drop all incoming packets
coming from wan to lan and guest. This is all that ShieldsUp tests
for.

Regards,

Kai

On Fri, Oct 12, 2012 at 9:22 PM, Shannon Kendrick
<shannon@kendrickonline.org> wrote:
> I'm still struggling to understand the firewall configuration. My goal is to use CeroWRT (with Codel) as my primary router, and I'm not comfortable having any ports open to the WAN even if they are filtered.  I'm using the free ShieldsUP!! port scanner hosted at grc.com to check for open ports. I would be nice if someone with expertise on the firewall rules could add to the wiki, or better yet a video on youtube that describes how to configure the rules.
> Thanks
> Shannon Kendrick
>
> On Oct 10, 2012, at 1:22 PM, Dave Taht wrote:
>
>> Several ports are open, but filtered, using various means. Does this
>> tool not show filtered?
>>
>> For example, rsync and ssh are enabled but the default settings in
>> /etc/xinetd.conf prohibit access via any but your internal private
>> ips.
>>
>> Telnet and ftp ports (not services) are enabled, but are there to
>> trigger sensors to disable other services in the advent of an attack
>> from inside or outside of your firewall.
>>
>> You can close ports more fully to the outside world via the gui,
>> editing /etc/config/firewall and/or do finer grained access control
>> via /etc/xinetd.conf and /etc/xinetd.d/
>>
>> The web port (80) defaults open, the web configuration port (81) does
>> not. The intent here is to enable you to put up your own local web
>> pages.
>>
>> See the onboard and wiki documentation for more details.
>>
>> Thx for trying cerowrt!
>>
>> On Wed, Oct 10, 2012 at 8:44 AM, Shannon Kendrick
>> <shannon@kendrickonline.org> wrote:
>>> What's the best resource for learning how to configure the firewall to close the ports that are open by default?  I installed 3.3.8-26 "sugarland" into a brand new WNDR3800 to be used as my home router, and I immediately ran ShieldsUp!! (grc.com) and noticed open ports.  However, I'm at a loss as to how to close them.
>>> Thanks,
>>> Shannon Kendrick
>>> _______________________________________________
>>> Cerowrt-devel mailing list
>>> Cerowrt-devel@lists.bufferbloat.net
>>> https://lists.bufferbloat.net/listinfo/cerowrt-devel
>>
>>
>>
>> --
>> Dave Täht
>>
>> Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html
>
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel