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Re: DNS Question

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Joseph Jenkins wrote:
http_port 172.24.245.7:3128

hierarchy_stoplist cgi-bin ?

acl QUERY urlpath_regex cgi-bin \?

cache deny QUERY

access_log /opt/csw/var/logs/access.log squid

 logfile_rotate 10

refresh_pattern ^ftp:           1440    20%     10080

refresh_pattern ^gopher:        1440    0%      1440

refresh_pattern .               0       20%     4320

acl apache rep_header Server ^Apache

broken_vary_encoding allow apache

acl all src 0.0.0.0/0.0.0.0

acl manager proto cache_object

acl localhost src 127.0.0.1/255.255.255.255

acl to_localhost dst 127.0.0.0/8

acl SSL_ports port 443

acl CONNECT method CONNECT

http_access allow manager localhost

http_access deny manager

http_access deny !Safe_ports

acl our_networks src 172.24.160.0/255.255.255.0 172.24.161.0/255.255.255.0 10.52.1.0/255.255.255.0 10.52.5.0/255.255.255.0

http_access allow our_networks

http_access deny all

icp_access deny all

 htcp_access deny all

cache_mgr joseph.jenkins@xxxxxxx <mailto:joseph.jenkins@xxxxxxx>

cache_effective_user latsquid

cache_effective_group bin

visible_hostname lauxproxy01.xxx.com

snmp_port 0

icp_port 0

coredump_dir /opt/csw/var/cache


Well, nothing out of the ordinary there.
It should be doing its own resolution from the servers in /etc/resolv.conf
It sounds like behaviour others have spoken of recently as 'working' in squid 2.5, but has been stopped as a security problem in 2.6.

If its not that, then I'm stumped on this one.

Amos

On Nov 16, 2007, at 2:45 PM, Amos Jeffries wrote:

Joseph Jenkins wrote:
I verified that the squid cache is not using it's own dns resolution for the clients browsing, instead it is relying on the client's dns resolution. I verified that the squid cache is able to do dns resolution. Is there an option that I need to enable in the squid.conf so that the cache will do dns resolution? Is there something else I need to install for this?

Should not be.
What is in your squid.conf (without comments) please.

Amos


TIA
On Nov 15, 2007, at 7:15 PM, Amos Jeffries wrote:
How do I verify that the cache is doing the dns resolution and it
isn't relying on the client's dns resolution?  So the "it" referred
setting up the cache to do dns resolution and not to use the clients
dns resolution.
On Nov 15, 2007, at 1:54 PM, Amos Jeffries wrote:

May be I am missing this, but I have not been able to find it.  How
do
I have the squid cache do the dns lookup and use that rather than
trusting the address that the client looks up?


'it' referring to what?
When using a proxy clients rarely ever do DNS lookups themselves.

Amos




Oh. You can:

enable the DNS section of debug logging in cache.log and watch the DNS
lookups in progress.

tcpdump/wireshark the data stream and see who is doing lookup for domains.

log on the local networks DNS server to see who is looking up what when.

(in recent squid) look in squids access.log to see where its requesting
traffic from for any given request.

use 'squidclient mgr:ipcache" to see what squid has resolved each domain to.

Amos






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