my squid questions

khodeir · 07-23-2010, 07:02 AM

hi all,
i am preparing all my things to make a proxy server using squid
i have some miss understands
i will add them here whenever i had a problem

first :
why i cant reach the net when i make this

Quote:

http_access deny all
http_access allow all

when i reverse the sentences it work!!!

second :
what does this line mean

Quote:

acl all src 0.0.0.0/0.0.0.0

does it mean all the ips ?
i don't understand why it is written like that
any explanations?

acid_kewpie · 07-23-2010, 09:00 AM

OK, well you block *EVERYTHING* and then allowed it all after you've denied it already... That's clearly still blocked. Similarily if you reverse the order, everything is allowed. the configs are read and applied in the order they appear in the file.

0.0.0.0/0.0.0.0 means everything. absolutely all addresses.

sem007 · 07-23-2010, 09:07 AM

Hi khodeir,

Quote:

first :
why i cant reach the net when i make this
Quote:
http_access deny all
http_access allow all
when i reverse the sentences it work!!!

It is depend on last line of access list. By default last line is deny all.

I can not write more (i am bit lazy )read http_access section in squid.conf file for more info.

Code:

#       If none of the "access" lines cause a match, the default is the
#       opposite of the last line in the list.  If the last line was
#       deny, the default is allow.  Conversely, if the last line
#       is allow, the default will be deny.  For these reasons, it is a
#       good idea to have an "deny all" or "allow all" entry at the end
#       of your access lists to avoid potential confusion.

Quote:

second :
what does this line mean
Quote:
acl all src 0.0.0.0/0.0.0.0
does it mean all the ips ?
i don't understand why it is written like that

Yes, it means all ip and subnet.
you can use this acl as

Code:

acl all src all

i hope it clear your doubts.

HTH

khodeir · 07-23-2010, 09:07 AM

wasn't better to write it as follows

Quote:

0.0.0.0/255.255.255.255

and what does this mean

Quote:

If none of the "access" lines cause a match,

acid_kewpie · 07-23-2010, 09:11 AM

no it's not better to write it as 0.0.0/255.255.255.255 as that means the exact opposite, it means nothing, as every single bit of the address is blocked out.

acid_kewpie · 07-23-2010, 09:11 AM

"If none of the "access" lines cause a match, " means that one of the lines that start with the word "access" needs to relate to the traffic it's processing.

khodeir · 07-23-2010, 09:13 AM

i can't understand it
very confusing to me
i feel my mind stuck

HasC · 07-23-2010, 12:28 PM

read the docs here

khodeir · 07-23-2010, 02:59 PM

I have read a lot
some help me with texts and explanation
but i could still not understand
if some one could provide an example it will be good

TB0ne · 07-23-2010, 03:40 PM

Quote:

Originally Posted by khodeir

I have read a lot
some help me with texts and explanation
but i could still not understand
if some one could provide an example it will be good

If you did read the documentation, you must have skipped the part where the EXAMPLES ARE.

Also, did you try Google? There are thousands of documents (with examples), available.

khodeir · 07-23-2010, 04:06 PM

i tried google but didn't reach any thing coz i didn't know what to write in it"key words"

TB0ne · 07-23-2010, 09:38 PM

Quote:

Originally Posted by khodeir

i tried google but didn't reach any thing coz i didn't know what to write in it"key words"

Spell out your words.

And since you're looking for squid access control rule examples, why not try "squid access control rule examples in Google??? I get about 95k hits....

khodeir · 07-25-2010, 02:31 PM

i found this link ,
it is too helpful
link