LinuxQuestions.org - very very bad.

mandrake 10.0

i have two systems.both are conencted to internet by a proxy server in my college.

i have a very bad stituation on my proxy server.

ONE COMPUTER HAS INTERNET BUT ANOTHER NOT?

FIRST COMPUTER RESULT.

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[root@localhost root]# traceroute 10.1.1.50
traceroute to 10.1.1.50 (10.1.1.50), 30 hops max, 38 byte packets
1 10.255.240.1 (10.255.240.1) 1.526 ms 1.468 ms 1.565 ms
2 10.1.16.1 (10.1.16.1) 9.349 ms 6.492 ms 6.078 ms
3 * * *
4 * * *
5 * * *
6 * * *
7 *

[root@localhost root]# nmap -v 10.1.1.50

Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2005-09-02 10:08 EDT
Host 10.1.1.50 appears to be down, skipping it.
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 12.041 seconds

[root@localhost root]# 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 ---
237 packets transmitted, 0 received, 100% packet loss, time 235983ms

[root@localhost root]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:11:09:17:3D:87
inet addr:10.255.240.214 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:65987 errors:0 dropped:0 overruns:0 frame:0
TX packets:19872 errors:0 dropped:0 overruns:0 carrier:0
collisions:936 txqueuelen:1000
RX bytes:11879449 (11.3 Mb) TX bytes:3035395 (2.8 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:106 errors:0 dropped:0 overruns:0 frame:0
TX packets:106 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:7448 (7.2 Kb) TX bytes:7448 (7.2 Kb)

[root@localhost root]#

SO CLEARLY I CAN NOT REACH PROXY SERVER.

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NOW LOOK THE SECOND SYSTEM THAT HAS INTERNET CONNECTION AT A SAME TIME.

[student@localhost student]$ 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=11.4 ms
64 bytes from 10.1.1.50: icmp_seq=2 ttl=62 time=3.69 ms
64 bytes from 10.1.1.50: icmp_seq=3 ttl=62 time=3.72 ms
64 bytes from 10.1.1.50: icmp_seq=4 ttl=62 time=3.76 ms
64 bytes from 10.1.1.50: icmp_seq=5 ttl=62 time=8.47 ms
64 bytes from 10.1.1.50: icmp_seq=6 ttl=62 time=21.3 ms
64 bytes from 10.1.1.50: icmp_seq=7 ttl=62 time=5.44 ms
64 bytes from 10.1.1.50: icmp_seq=8 ttl=62 time=10.7 ms
64 bytes from 10.1.1.50: icmp_seq=9 ttl=62 time=10.2 ms
64 bytes from 10.1.1.50: icmp_seq=10 ttl=62 time=16.4 ms
64 bytes from 10.1.1.50: icmp_seq=11 ttl=62 time=3.72 ms
64 bytes from 10.1.1.50: icmp_seq=12 ttl=62 time=3.80 ms
64 bytes from 10.1.1.50: icmp_seq=13 ttl=62 time=10.9 ms
64 bytes from 10.1.1.50: icmp_seq=14 ttl=62 time=4.35 ms
64 bytes from 10.1.1.50: icmp_seq=15 ttl=62 time=13.9 ms
64 bytes from 10.1.1.50: icmp_seq=16 ttl=62 time=3.90 ms
64 bytes from 10.1.1.50: icmp_seq=17 ttl=62 time=8.26 ms
64 bytes from 10.1.1.50: icmp_seq=18 ttl=62 time=3.73 ms
64 bytes from 10.1.1.50: icmp_seq=19 ttl=62 time=3.73 ms
64 bytes from 10.1.1.50: icmp_seq=20 ttl=62 time=3.74 ms
64 bytes from 10.1.1.50: icmp_seq=21 ttl=62 time=3.70 ms
64 bytes from 10.1.1.50: icmp_seq=22 ttl=62 time=3.71 ms
64 bytes from 10.1.1.50: icmp_seq=23 ttl=62 time=3.82 ms
64 bytes from 10.1.1.50: icmp_seq=24 ttl=62 time=3.81 ms
64 bytes from 10.1.1.50: icmp_seq=25 ttl=62 time=8.71 ms
64 bytes from 10.1.1.50: icmp_seq=26 ttl=62 time=7.30 ms
64 bytes from 10.1.1.50: icmp_seq=28 ttl=62 time=14.3 ms
64 bytes from 10.1.1.50: icmp_seq=29 ttl=62 time=6.77 ms
64 bytes from 10.1.1.50: icmp_seq=30 ttl=62 time=8.77 ms
64 bytes from 10.1.1.50: icmp_seq=31 ttl=62 time=10.0 ms
64 bytes from 10.1.1.50: icmp_seq=32 ttl=62 time=3.73 ms

--- 10.1.1.50 ping statistics ---
32 packets transmitted, 31 received, 3% packet loss, time 31304ms
rtt min/avg/max/mdev = 3.697/7.429/21.399/4.504 ms
[student@localhost student]$ tracerou
traceroute traceroute6
[student@localhost student]$ traceroute 10.1.1.50
traceroute to 10.1.1.50 (10.1.1.50), 30 hops max, 38 byte packets
1 10.255.240.1 (10.255.240.1) 1.367 ms 2.383 ms 1.590 ms
2 10.1.16.1 (10.1.16.1) 11.405 ms 9.170 ms 5.118 ms
3 10.1.1.50 (10.1.1.50) 3.369 ms 3.356 ms 4.510 ms

[root@localhost root]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:11:09:1C:E2:6E
inet addr:10.255.240.211 Bcast:10.255.255.255 Mask:255.255.240.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:196006 errors:0 dropped:0 overruns:0 frame:0
TX packets:43671 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:37772336 (36.0 Mb) TX bytes:11462545 (10.9 Mb)
Interrupt:11 Base address:0x1000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:46331 errors:0 dropped:0 overruns:0 frame:0
TX packets:46331 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:10844898 (10.3 Mb) TX bytes:10844898 (10.3 Mb)

[root@localhost root]#

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does any one know why my system 1 is not looking the proxy server.
or is there any internal problem.

details:

proxy server address:10.1.1.50
DHCP server address:10.1.16.1

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help pls.