internet connection problem.
 

mandrake 10.0

I have internet connection in my university.I have an internet connection problem here.
We have internet connection by an proxy server and by DHCP server.i HAVE A PROBLEM IN IP ADDRESS.

look at the result...

linux:~ # ifconfig eth0 10.255.240.102
linux:~ # ping 10.1.1.50
PING 10.1.1.50 (10.1.1.50) 56(84) bytes of data.

--- 10.1.1.50 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 4998ms

linux:~ # ifconfig eth0 10.255.240.104
linux:~ # ping 10.1.1.50
PING 10.1.1.50 (10.1.1.50) 56(84) bytes of data.
64 bytes from 10.1.1.50: icmp_seq=1 ttl=62 time=4.26 ms
64 bytes from 10.1.1.50: icmp_seq=2 ttl=62 time=4.49 ms
64 bytes from 10.1.1.50: icmp_seq=3 ttl=62 time=4.16 ms

--- 10.1.1.50 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.163/4.310/4.499/0.150 ms
linux:~ # ifconfig eth0 10.255.240.103
linux:~ # ping 10.1.1.50
PING 10.1.1.50 (10.1.1.50) 56(84) bytes of data.
64 bytes from 10.1.1.50: icmp_seq=1 ttl=62 time=10.1 ms
64 bytes from 10.1.1.50: icmp_seq=2 ttl=62 time=4.27 ms
64 bytes from 10.1.1.50: icmp_seq=3 ttl=62 time=4.18 ms

--- 10.1.1.50 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 4.185/6.206/10.158/2.795 ms
linux:~ #


here 10.1.1.50 is my proxy server.When i set 10.255.240.102 i can not get the internet connection.For other values of IP address i can get it right..

So that can u please help me to figure out what are the IP address range for which i get the internet connection.

Thanks.

I'm not entirely sure what you are saying. Is it that when you are assigned certain IP addresses by the DHCP server you cannot access the internet from a lan inside the university? If so what do you mean when you say 'when I set the IP to ...?"

let me tell u the story..

my system is probing for DHCP server.And it get's the IP address.But it could not get in it the proxy server where IP given by DHCP server.
So i try to put my own IP address (above shown)
That also not working.I am thinking that why the hell DHCP server assigns a wrong IP address?And i looked around my subnet and assined the correct IP address.Now i can browse the internet.
i do not think the diffrence in 10.255.240.102 and or 103 or 104.
But the hell *.102 is not working?

U know the reason?

Now I understand but don't know why, obviously not a connection, DNS resolution problem or firewall problem, if that computer browses the internet ok if all you do is give it a different static IP address instead of one assigned by DHCP server. The only thing I can think of is that the range of allowed addresses in proxy configuration file excludes that address for some reason, it is assigned to another subnet perhaps.

thanks for idea...

Now is there any idea or way to get a list of proxy server allowed IP range.
By query or using some command?Or dir. contacting the proxy server admin.?

I think contacting the proxy server admin may be the way to go..as for security reasons you would not be able to edit the proxy configuration file. They may also come up with an alternative explanation for the problem and fix it.

Cheers

MazinOz