networking sandboxed (or something like it)

[franzix]

I've used linux for years, but i'm no power user. Not afraid of xterm, but i'd rather let someone else write shell scripts, then download them. Anyway, I have a problem that I think is odd. The IT people on campus insist that the problem is with my linux install, but I'm not convinced. It happens on new installs of fedora 7.92 and 8(network). Net quits working after first reboot. Here is the deal:

Dell Optiplex 755
Core 2 Duo
2048 MB RAM
Radeon 2400 HD Graphics
Intel Pro10/100/1000 Ethernet.

That should be enough details on the machine. The problem: I can't connect to IP addresses outside of my university. I resolve an IP via DHCP:

eth0 Link encap:Ethernet HWaddr 00:1A:A0:C5:AC:35
inet addr:139.78.189.47 Bcast:139.78.191.255 Mask:255.255.248.0
inet6 addr: fe80::21a:a0ff:fec5:ac35/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:48756 errors:0 dropped:0 overruns:0 frame:0
TX packets:930 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:5128611 (4.8 MiB) TX bytes:148096 (144.6 KiB)
Memory:80200000-80220000

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:7886 errors:0 dropped:0 overruns:0 frame:0
TX packets:7886 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:16372652 (15.6 MiB) TX bytes:16372652 (15.6 MiB)

I can ping local hosts.

ping www.okstate.edu
PING web10.it.okstate.edu (139.78.132.6) 56(84) bytes of data.
64 bytes from web10.it.okstate.edu (139.78.132.6): icmp_seq=1 ttl=125 time=0.717 ms
64 bytes from web10.it.okstate.edu (139.78.132.6): icmp_seq=2 ttl=125 time=0.710 ms
64 bytes from web10.it.okstate.edu (139.78.132.6): icmp_seq=3 ttl=125 time=0.735 ms
64 bytes from web10.it.okstate.edu (139.78.132.6): icmp_seq=4 ttl=125 time=0.737 ms
64 bytes from web10.it.okstate.edu (139.78.132.6): icmp_seq=5 ttl=125 time=0.725 ms
64 bytes from web10.it.okstate.edu (139.78.132.6): icmp_seq=6 ttl=125 time=0.744 ms
64 bytes from web10.it.okstate.edu (139.78.132.6): icmp_seq=7 ttl=125 time=0.723 ms

I can't ping or connect to external sites:


$ ping www.ufl.edu
PING virtual-wa-web1.osg.ufl.edu (128.227.74.50) 56(84) bytes of data.


--- virtual-wa-web1.osg.ufl.edu ping statistics ---
11 packets transmitted, 0 received, 100% packet loss, time 9999ms
$ ping www.google.com
PING www.l.google.com (64.233.167.99) 56(84) bytes of data.

--- www.l.google.com ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 3999ms


Any suggestions? I'm convinced that someone is blocking me.

[Zotter]

Default gateway?

Your system knows how to handle traffic on it's own network. Does it know where to send traffic it can't handle?

give the 'route' command. What's the default gateway? Is it the same one a Windows PC on that LAN would use?

Likely you can resolve IPs cuz your DNS server is 'local' to your LAN.

[stevea]

Default gateway?

Your system knows how to handle traffic on it's own network. Does it know where to send traffic it can't handle?

give the 'route' command. What's the default gateway? Is it the same one a Windows PC on that LAN would use?

Likely you can resolve IPs cuz your DNS server is 'local' to your LAN.


Well it's worth a look *BUT* he already has accessed a system off his LAN so his routing table is at least sufficient to get off the LAN.

He is net 139.78.189.47 Bcast:139.78.191.255 Mask:255.255.248.0
So his LAN is 139.78.184.0 .... 139.78.191.255
He can ping 139.78.132.6 which is NOT on his LAN (but it's on his campus).

So yeah - post your route table, the output of "ip route"
and post the file /etc/resolv.conf (it will probably just have a line like "nameserver 139.78.x.y"),
but these are probably OK.

==
I *suspect* what you are seeing is a proxy-server on your campus as a portal to off-campus. This is very common. You'll need to config the proxy server address. I *do* believe there is an auto-configuration capability, but it's been too long since I dealt with this problem.

If I were you I'd go to the System->Preferences->Internet and Network->Network Proxy
item and select the proxy auto-config and see where that takes you. You may need to
stop/start the interface or even reboot.

BTW I have a system w/ the Intel Pro 10/100/1000, F8.test3 - zero network problems.