hi.
i am using mandrake 10.0 +KDE

i have big problem with internet.
my network connections and settings are okay.

the only problem is with IP address of DNS server.

my standard ip address is 10.1.1.50.

sometimes it suddenly said permission denied.

when i look on 10.1.1.2 address internet working.

sometimes i do not know 10.1.1.50 or 10.1.1.2

so how to find this address by " nmap " or any other way.

or is any othere tool to find this address.


sometimes i have this problem what should i do?.


The requested URL could not be retrieved

While trying to retrieve the URL: http://mail.yahoo.com/

The following error was encountered:

Unable to determine IP address from host name for mail.yahoo.com

The dnsserver returned:

Server Failure: The name server was unable to process this query.

This means that:

The cache was not able to resolve the hostname presented in the URL.
Check if the address is correct.

Your cache administrator is root.
Generated Sun, 03 Apr 2005 05:41:14 GMT by ns2.annauniv.edu (squid/2.5.STABLE3)



sometimes the error was




The requested URL could not be retrieved

While trying to retrieve the URL: http://www.google.com/

The following error was encountered:
* Access Denied.
Access control configuration prevents your request from being allowed at this time. Please contact your
service provider if you feel this is incorrect.

Your cache administrator is root.
____________________________________________________________________________________________________ ________


Generated Sun, 03 Apr 2005 05:53:52 GMT by rcc.annauniv.edu (squid/2.5.STABLE3)



here which address i choose ?and how to find that...please help me..

give more information about your network configuration, so we can help you!

[staff@Simlab-node10 staff]$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:11:09:17:3D:87
inet addr:10.255.240.176 Bcast:10.255.255.255 Mask:255.255.240.0
inet6 addr: fe80::211:9ff:fe17:3d87/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:284418 errors:0 dropped:0 overruns:0 frame:0
TX packets:22196 errors:0 dropped:0 overruns:0 carrier:0
collisions:2083 txqueuelen:1000
RX bytes:26321711 (25.1 Mb) TX bytes:18338040 (17.4 Mb)
Interrupt:23 Base address:0xb000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:481 errors:0 dropped:0 overruns:0 frame:0
TX packets:481 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:39773 (38.8 Kb) TX bytes:39773 (38.8 Kb)

[staff@Simlab-node10 staff]$




[root@Simlab-node10 staff]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.255.240.0 * 255.255.240.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 10.255.240.1 0.0.0.0 UG 0 0 0 eth0
[root@Simlab-node10 staff]#



[staff@Simlab-node10 staff]$ nmap 10.1.1.50

Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2005-04-04 17:34 IST
Interesting ports on Simlab-node10.mit (10.1.1.50):
(The 1656 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
22/tcp open ssh
111/tcp open rpcbind
3128/tcp open squid-http

Nmap run completed -- 1 IP address (1 host up) scanned in 6.662 seconds
[staff@Simlab-node10 staff]$




[staff@Simlab-node10 staff]$ nmap 10.1.1.2

Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2005-04-04 17:34 IST
Note: Host seems down. If it is really up, but blocking our ping probes, try -P0
Nmap run completed -- 1 IP address (0 hosts up) scanned in 24.010 seconds
[staff@Simlab-node10 staff]$



now i am using 10.1.1.50 address.
sometimes this is not a correct address that is 10..1.1.2.

so when i change in mozilla edit-->preference-->advanced-->proxy.

i changed to 10.1.1.2. so my internet working.



so how to find the address either 10.1.1.50 or 10.1.1.2 or whatever address?

can we done by namp command?

i mean proxy server address.
administrator suddenly running squis in other systems.

so how to list the systems are currently the squid-http service.

i mean what is the command to find..!!!