Re: Transparent proxy question

[Sasa Stupar <sasa@stupar.homelinux.net>]

Antony Stone pravi:

> On Monday 15 March 2004 10:47 am, Sasa Stupar wrote:
> 
> 
>>Antony Stone pravi:
>>
>>
>>>>$IPT -t nat -A POSTROUTING -o $INIF -s $INNET -d 192.168.10.10 -j SNAT
>>>>--to 192.168.10.111
>>>>
>>>>Is there something to add or change here?
>>>
>>>Yes.   Remove the POSTROUTING rule, because it is specifically changing
>>>the source address of all packets sent to the proxy server to be that of
>>>the firewall.
>>
>>Not good. Now my transparent proxy doesn't work anymore. :(
>>What's the catch?
> 
> 
> 1. Now that it isn't working, do you get any errors in your proxy log file, or 
> does it think there are no requests?
> 2. What source IPs does your proxy server allow access for?
> 3. Does the proxy server know how to route back to the clients?
> 4. Do you have a suitable ESTABLISHED,RELATED rule on your firewall to allow 
> back the replies?   (I expect so, but you didn't post your full ruleset 
> earlier, so I can't be sure...)
> 5. Where are the clients on the network in relation to the firewall and the 
> proxy server (please don't tell me they're on the same subnet as the 
> proxy...?)
> 
> Regards,
> 
> Antony.
> 

1. I've got nothing in the squid log but in the browser I get Timeout 
error, so looks like squid doesn't get any requests
2. It allows for LAN IP's
3. Yep
4. Yep $IPT -A STATE -m state --state ESTABLISHED,RELATED -j ACCEPT
5. Some of them are on the same subnet and some not.

Regards,
Sasa