DHCP not working in MAN network

[jmnieto]

Hello everybody,

I have being googling for several days trying to fix my network connection but that hasn't been possible, I hope that you can help me.

I have a fresh LinuxMint installation in my machine. I am trying to connect to the MAN network in Darmstadt-Germany. I have tried to connect with windows and everything works.

Some interesting facts are:
- If i try a manual configuration i am able to ping to the default gateway and the dns servers, but i am not able to resolv dns, i also cant browse using the ips of google for example. I cant ping "outside", i tried with 8.8.8.8 and i got a timeout.

- If i try a dhcp configuration, nothing works. I cant ping the default gateway, neither the dns servers.

I have also tried using the dhclient coomand stating the server ip like this(as superuser already): dhclient -4 -v -s 130.83.81.254, and afther the timeout i am not able to get a lease.

Some more info:

linuxmint jorge # ifconfig
eth0 Link encap:Ethernet HWaddr 08:2e:5f:76:48:f0
inet addr:130.83.81.152 Bcast:130.83.81.255 Mask:255.255.255.128
inet6 addr: fe80::a2e:5fff:fe76:48f0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5382 errors:0 dropped:6 overruns:0 frame:0
TX packets:2163 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:515054 (515.0 KB) TX bytes:376682 (376.6 KB)
Interrupt:43 Base address:0xa000

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:151 errors:0 dropped:0 overruns:0 frame:0
TX packets:151 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:12785 (12.7 KB) TX bytes:12785 (12.7 KB)

output produced by lspci

0b:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 07)
Subsystem: Hewlett-Packard Company Device 1818
Flags: bus master, fast devsel, latency 0, IRQ 43
I/O ports at 2000 [size=256]
Memory at d4404000 (64-bit, prefetchable) [size=4K]
Memory at d4400000 (64-bit, prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
Capabilities: [d0] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 00-00-00-00-68-4c-e0-00
Kernel driver in use: r8168
Kernel modules: r8168, r8169