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........

If you run nginx behind a CDN, you will by default see the proxy/CDNIPinstead of the real client. Edit the global http { part of nginx.conf and add this: # 1. Specify the IP address of your trusted proxy/load balancer set_real_ip_from 1.2.3.4; set_real_ip_from 5.2.3.4; # 2. Specify which header contains the real client IP real_ip_header X-Forwarded-For;........

This is how we configure outside PSTNaccess or dialing through another SIPtrunk. Beware that this a simplistic example that neglects most security including SRTP First you'll need to be in config mode: Step - 1 Enter Voice Service VOIP security options There are more options but for now we'll just focus on security/allowing connections to and from our phones and the trunk. Router(config)#voice service voip ........

Make sure this makes sense for you but I've started to block a lot of commercial Cloud services and easily accessible providers as they are a very high source of abusive traffic. The cost savings for a lot of organizations are huge, as you now have less bandwidth usage and less resource usage from garbage/bot/malicious traffic. This mainly works for when you can be reasonably sure that your audience has no business visiting your service(s) from freely accessible commercial IP ........

Just a quick note and warning is that if you are testing to see if EFIPXE booting works on a VM, MAKE SURE it actually works. For example Iinitially tested using my Distro's QEMU 2.5+dfsg-5ubuntu10.46 and ovmf BIOS firmware (OVMF supports EFI). However, I found on old versions of QEMU (like 2.5), EFIbooting with GRUB NEVER works so it may appear that you have made a mistake when everything is fine when you boot a physi........