Ping not working

What do you mean by currently? You were able to ping before? Before what? All of your other networking works properly? Are you using a VPN, proxy, or any other sort of funky low-level networking software?

fluberbuton wrote:
I was able to ping for a while, but then it stopped when I tried to flood my pc at home. From then any ping I tried resulted in a timeout

Flood ping? They say that's pretty rough on a network. I'll bet your interface is down. Try this:
ifconfig | grep status

Flood ping across a public network? +Bad idea+ That's best left for the folks seeking to attack your servers. And trying that can sometimes activate network defenses. (Further, your server or your gateway should typically not be configured to respond to external ICMP (ping) traffic.)

Based on the ping data, your local network or your upstream IP routing is stuffed.

Somehow.

This could have any number of triggers. Bad gateway setting. Bad or mismatched subnet mask settings. Misconfigured subnet routing, if you're using multiple subnets. A failed or misconfigured gateway router. Failed switch. Bad or disconnected wire. Overly-zealous firewall settings. ISP outage. Failure at the network demarc device.

Some sort of a network-level configuration error among the [various IP network pieces and parts|http://labs.hoffmanlabs.com/node/275].

Try pinging local hosts (to try to isolate the error), and reconfirm your local IP network settings (gateway router, subnet mask, IP addresses, your own local DNS server of you're running that) within your network, and reconfirm settings with your ISP, and then start checking devices and performing swaps to test individual devices.

Your DNS or your LAN or your IP routing is having a problem. But you knew that.

Post the output of:

$ dig localhost
$ ping -c 4 8.8.8.8
$ ifconfig

And we'll have a look.