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Ubuntu 12 crashed and took down network

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http://serverfault.com – We recently set up a new Ubuntu 12.04LTS server on our network. It's not fully configured so it's not doing much beyond sshd and a default apache2 install. But this evening it appears to have crashed. It wasn't responding to the network or the keyboard. But the worst part is, it took down the entire network. My knowledge of the network stack below OSI layer 3 is very limited, so the rest confuses me. When this machine was physically connected to the network, no other machine could connect to the outside internet. When things were broken, running arp showed that our gateway's IP address (HowTos)

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Submitted by u85500 on 07/09/2012 – Made popular on 07/09/2012

Stories similar to Ubuntu 12 crashed and took down network

Lets say there is Machine A (Ubuntu) in Network A and Machine B in Network B. There is also Machine C (Windows 7) in Network B and I can access it through RDP from Machine A. What I need is to be able to reach Machine B from Machine A (i.e. can ping it, connect to arbitrary port, etc). How can I manage something like this?

PS: Network B is a dmz, i.e.

I have an Ubuntu Server 12.04, with two network cards:

eth0 is connected to the internet eth1 is connected to a private network (192.168.10.1)

The server is configured as a gateway and hosts DNS and DHCP fro the private network. Computers in the private network (say with IP address 192.168.10.50) can successfully connect to the internet.

I am stuck in a situation where I have only one Ethernet wire (with Internet) and another Ubuntu machine.

I am trying to use ad-hoc mode to share the Internet connection. I am not able to install dhcp3-server due to some conflict in the current ubuntu release (12.04).

So far the ad-hoc network is up and both the machines can talk to each other (over 264.X.X) network.

i want to use pc as gateway.. i have pc with ubuntu 10.04 with 2NICS.. eth1(ip is 10.6.15.254) - NIC1 is connected to local network 10.6.15.0 eth2(ip is 10.6.0.115) -NIC2 is connected to the external world(internet)

From any client machine within the 10.6.15.0 network i m able to access the other machine in 10.6.15.0 network..

Hello,

I'm experiencing a very strange issue: on one laptop I cannot connect to one particular network, only on Ubuntu.

Okay, so I've recently set up a server with Ubuntu Server 12.10 to run as a headless server. When I ran the OS installer/setup it gave me an option to immediately connect to a wireless network (this box has a wireless card), and so I connected to my home network.

hi guys, a newbie network administrator here... i have a PC, I want to use it as transparent proxy server and also running one virtual machine as MySQL server, I'm using 3 network cards,

eth0 is used to connect the server to my router (WAN) (IP 192.168.0.2) eth1 is used as gateway to share internet connection to my network (IP 192.168.1.1) and last can i use eth2 (192.168.1.2) as bridged NIC to

Okay, so I've recently set up a server with Ubuntu Server 12.10 to run as a headless server. When I ran the OS installer/setup it gave me an option to immediately connect to a wireless network (this box has a wireless card), and so I connected to my home network.

My problem is how to access guest VM from outside network. I am going to describe my problem in details.

I have single machine with Ubuntu Server 12.04 LTS contains two NICs. One NIC is connected to my gateway(i.e. 10.0.0.1) and 10.0.0.3 is IP address of this interface. Another NIC has IP 192.168.0.3 but this is a part of Bridge(i.e. br0).