ADSL, Proxy & Bridge

[Rick Stevens]

Jhon Ramawi Putra wrote:
> Dear Gurus...
> 
> May be this is a beginner question, but any help will be appreciated.
> This is existing my network diagram:
> 
> (.....Internet.....) --- [ADSL MODEM]-----[LAN Switch] ---- Desktops 
> (192.168.0.1, etc....)
>                       192.168.0.9 
> 
> The ADSL Modem act as gateway.
> 
> Now i want to configure my network to be like this:
> 
> (.....Internet.....) ---[ADSL MODEM]
>                 ip : 10.0.0.1, net mask : 255.0.0.0
>                         |
>                         |
>                 eth0: 10.0.0.2, net mask : 255.0.0.0
>                 [Computer A] 
>                 eth1:192.168.0.10 netmask : 255.255.255.0
>                         |
>                         |
>                 [LAN Switch] ----  Desktops (192.168.0.1, etc ... with 
> netmask : 255.255.255.0)
>  
> The ADSL Modem is attached to Computer A via eth0. Then my eth1 is 
> connected to LAN. I want to make Computer A as Proxy Server .
> 
> Then i tried to make a  "bridge" using brctl, and followed every step in 
> "How to" documents that i found from googling, but i got no success. 
> Computer A can ping to LAN Clients dan Browse to Internet. LAN Clients can 
> ping Computer A, but they can't ping The ADSL Modem and browse internet. 
> So, i assumed that the bridge didn't working well.

You need to enable IP forwarding in computer-a to make it act as a
router.  For that, either do this:

	echo 1 >/proc/sys/net/ipv4/ip_forward

or change the line in /etc/sysctl.conf that reads:

	net.ipv4.ip_forward = 0

to

	net.ipv4.ip_forward = 1

and either reboot or use "sysctl -w net.ipv4.ip_forward=1".  For proxy
operations, you should install and configure squid.
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- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-    Admitting you have a problem is the first step toward getting   -
-    medicated for it.      -- Jim Evarts (http://www.TopFive.com)   -
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