Hey Frantisek,
This is no squid problem.
since it's intercept proxy the client tries to do a dns lookup for the
www.example.com but since it dosn't have any way to get the dns result
for this domain it shows the client the problem it has.
Firefox dont know to what IP send the requests.
In this situation the client dont even send a request at all that squid
can intercept.
Handle this kind of network issues in another level then squid\application.
Regards,
Eliezer
On 1/10/2013 3:11 PM, Frantisek Remias wrote:
OK, the problem is that it still show browser default error message
like before when the domain cannot be resolved
The error message is like
"Server not found. Check if the address for typing errors such as
ww.example.com of www.example.com" in firefox.
I need to show custom page instead of this browser default page when
there is no internent connection
2013/1/10 Amos Jeffries <squid3@xxxxxxxxxxxxx>
On 10/01/2013 9:38 p.m., Frantisek Remias wrote:
Hello,
thank you for the response.
If I set the browser to use proxy a there is temporarily no internet
connection..then it shows the custom page (the ERR_DNS_FAIL one). BTW:
Is it possible to define another custom page when the internet
connection is not available (so it will shows different one when there
is DNS problem and another if internet connection is unavailable?)
How is Squid to know about connection unavailable? It is not making a
connection, just doing DNS lookup at this point to determine where the
connection might go in future. It is entirely possible (and normal) that
routing make the DNS go through one upstream link and HTTP packets through
another.
If I dont set the browser to use proxy (meaning it will use
transparent mode proxy). It shows default browser error message like
"Internet Explorer cannot display the webpage" or "Server not
found...Firefox cant found the server at www.".... in firefox. What I
need is to show the squid custom page in this case there isnt internet
connection available
Interfaces these days offer scripted hooks. So...
You configure Squid with:
http_port 3128 intercept name=port1
http_port 3129 intercept name=port2
acl port2 myportname port2
deny_info ERR_CUSTOM port2
http_access deny port2
Then you make a script which changes the iptables rules sending traffic to
port #2 of Squid when the link goes down and sending traffic to port #1 of
Squid when it goes up.
Amos
