How to ping all of Googlebot's IPs script
First get the json with all the IP ranges
wget https://developers.google.com/static/crawling/ipranges/common-crawlers.json -O google.txt
Use this script to get the results. It may be smart to grep on "time=" to just get the IPs that returned results/were pingable.
for ip in `cat google.txt |grep ipv4|cut -f 2 -d :|sed 's#"##g'|cut -f 1 -d /`; do
o1=`echo $ip|cut -f 1 -d .`
o2=`echo $ip........
iptables redirect ports to a different host and port + NAT Masquerade howto/solution
This is important if you need public access to internal IPs such as at your office and don't want to use a VPN just to SSHinto different servers:
Below forwards the port "10001" to the IP192.200.5.53 on port 22 (of course adjust it to your needs).
iptables -t nat -A PREROUTING -p tcp --dport 10001 -j DNAT --to-destination 192.200.5.53:22
Remember to enable MASQUERADE on your NAT IPs or they won't be able to talk to the outside world (........
Setup PXE Boot using Centos and dhcpd, tftp and syslinux
This is something I often setup for clients because it's very helpful for people in datacenters, this allows custom OS installs on demand, you can customize it more by using kickstart etc.. but here's a base I use before customizing more:
This little script below will install everything you need to get booting by PXE Linux.
It also assumes you set a local IP (be sure not to overwrite your existing IP) on eth0:0 (note the :0) as 192.168.1.10 and it........