CentOS - May 2011 - Centos as Gateway ? (Router/transparent proxy)

Hi All,

I'm lately suffering from Quota abuse at home. believe it or not my 
teenagers are eating through my allowed quota.

Hence, i'm thinking of setting up a centos machine to work as such:

HDSL modem(natted to an onboard dhcp service for lan users) -> Centos - 
 > Switch - LAN users


Hw specs:

3 GB ram
3.0 core 2 duo
2 X 1 TB HDD
2 X 1 Gb NIC


Centos will contain the following:

     1. DHCP # is there a way i could use the modem's dhcp service 
instead? or using a centos based dhcp service is better?
     2. Samba # sharing files for lan users
     3. Squid
     4. clamav
     5. OpenRadius # wifi authentication
     6. knockd service (anyone tried it? i read about this service a few 
weeks ago and am wondering if it's worth giving it a shot... for public 
access to the server )
     6. Things which are needed :
             a. Ability to separate Wireless router from LAN. (thinking 
of vlans though as i have a dumb switch am thinking of adding a 3d NIC 
to my desktop and dedicating it to the wifi ? )
             b. Accountablity of quota and bandwidth used (i was 
thinking of SARG and SQstat for squid)
             c. using some sort of shell script that will parse squid 
logs (mysar will help me access squid logs through mysql) and if someone 
bypassed their allowed quota for the day they will be moved to a delay 
pool with lower bandwidth.

As you noticed above, my whole "connection management" is relying on 
squid,  i'm worried that it will process only traffic that's forwarded 
to port "80" instead of everything going through the server. any idea
if
thats the case?


I previously thought of untangled, and IPCOp, though i don't want a 
standalone router as i'd like to be able to use VirtualBox over it 
occasionally.
waiting for your advice about the above setup, keep in mind that i don't 
mind changing the setup if there's something better to use, actually i 
do prefer it.

Best,


--Roland

Roland Roland wrote:
>   Hi All,
> 
> I'm lately suffering from Quota abuse at home. believe it or not my 
> teenagers are eating through my allowed quota.
> 
> Hence, i'm thinking of setting up a centos machine to work as such:
> 
> HDSL modem(natted to an onboard dhcp service for lan users) -> Centos - 
>  > Switch - LAN users
> 
> 
> Hw specs:
> 
> 3 GB ram
> 3.0 core 2 duo
> 2 X 1 TB HDD
> 2 X 1 Gb NIC
> 
> 
> Centos will contain the following:
> 
>      1. DHCP # is there a way i could use the modem's dhcp service 
> instead? or using a centos based dhcp service is better?
>      2. Samba # sharing files for lan users
>      3. Squid
>      4. clamav
>      5. OpenRadius # wifi authentication
>      6. knockd service (anyone tried it? i read about this service a few 
> weeks ago and am wondering if it's worth giving it a shot... for public
> access to the server )
>      6. Things which are needed :
>              a. Ability to separate Wireless router from LAN. (thinking 
> of vlans though as i have a dumb switch am thinking of adding a 3d NIC 
> to my desktop and dedicating it to the wifi ? )
>              b. Accountablity of quota and bandwidth used (i was 
> thinking of SARG and SQstat for squid)
>              c. using some sort of shell script that will parse squid 
> logs (mysar will help me access squid logs through mysql) and if someone 
> bypassed their allowed quota for the day they will be moved to a delay 
> pool with lower bandwidth.
> 
> As you noticed above, my whole "connection management" is relying
on
> squid,  i'm worried that it will process only traffic that's
forwarded
> to port "80" instead of everything going through the server. any
idea if
> thats the case?
> 
> 
> I previously thought of untangled, and IPCOp, though i don't want a 
> standalone router as i'd like to be able to use VirtualBox over it 
> occasionally.
> waiting for your advice about the above setup, keep in mind that i
don't
> mind changing the setup if there's something better to use, actually i 
> do prefer it.
> 
> Best,
> 
> 
> --Roland
Check out ClearOS. It's based on CentOS and can install extra CentOS 
packages you need. If you add CentOS repositories in yum config you 
could add KVM instead of VirtualBox, or headless VirtualBox it that is 
possible.
Almost all you need is there and packaged in nice Web interface. I also 
always add Webmin to it.

Ljubomir

Roland Roland wrote on Mon, 2 May 2011 15:09:00 +0300:
> As you noticed above, my whole "connection management" is relying
on
> squid,  i'm worried that it will process only traffic that's
forwarded
> to port "80" instead of everything going through the server. any
idea if
> thats the case?
Correct. The easy solution is to ban bittorrent and other P2P services. 
There's a 99% chance that this is what eats up your traffic. And youtube.
Banning P2P lets you sleep better in the night, too.

Kai

Roland Roland <R_O_L_A_N_D at ...> writes:
> Hence, i'm thinking of setting up a centos machine to work as such:
> 
> HDSL modem(natted to an onboard dhcp service for lan users) -> Centos - 
>  > Switch - LAN users
> 
> Hw specs:
> 
> 3 GB ram
> 3.0 core 2 duo
> 2 X 1 TB HDD
> 2 X 1 Gb NIC
Your proposed configuration is pretty close to what I've been running for
several years (my original server had an AMD K-6 and ran Red Hat 6). The
hardware is way more than sufficient.  I have CentOS doing the natting instead
of the modem.  Just use the modem as a pass through.  

Pretty much everything I've done is documented on my blog at
http://davenjudy.org/davesBlog.  I describe what I've done on the blog and
that
way I document what I did for my future use and someone else might be able to
use it.
> 
> Centos will contain the following:
> 
>      1. DHCP # is there a way i could use the modem's dhcp service 
> instead? or using a centos based dhcp service is better?
>      2. Samba # sharing files for lan users
See my blog.
>      3. Squid
>      4. clamav
Don't do clamav since I even got my wife to use Linux.  No real need for
squid.
>      5. OpenRadius # wifi authentication
See my blog.
>      6. knockd service (anyone tried it? i read about this service a few 
> weeks ago and am wondering if it's worth giving it a shot... for public
> access to the server )
I just used public keys for ssh and disabled password login.  I also suggest you
move the sshd port to something non-standard just to cut down on the fruitless
attempts to login there.  The script kiddies generally don't scan to see if
sshd
is listening on a non-standard port.
>      6. Things which are needed :
>              a. Ability to separate Wireless router from LAN. (thinking 
> of vlans though as i have a dumb switch am thinking of adding a 3d NIC 
> to my desktop and dedicating it to the wifi ? )
3rd NIC is probably the easiest with a crossover cable to the WiFi AP.  That way
you can easily set up specific firewall rules for the WiFi traffic.
>              b. Accountablity of quota and bandwidth used (i was 
> thinking of SARG and SQstat for squid)
>              c. using some sort of shell script that will parse squid 
> logs (mysar will help me access squid logs through mysql) and if someone 
> bypassed their allowed quota for the day they will be moved to a delay 
> pool with lower bandwidth.
> 
Hopefully, someone else can help you with these.

Most of my recent blog posts deal with setting up IPv6.  You'll need to look
through the "CentOS server set up and maintenance notes" section for
some of the
older articles (DHCP, RADIUS, etc.).

Cheers,
Dave