Private IP Ranges
A self note. List of private address ranges Class A: 10.0. 0.0 to 10.255. 255.255. Class B: 172.16. 0.0 to 172.31. 255.255. Class C: 192.168. 0.0...
Networking
HOW TO : Query varnishlogs to show backend server
Command parameters for varnishlog to view the backend server that is processing the request. In this particular case, I wanted to see the request URL and...
HOW TO : Check websockets using curl
Found this good article by Mark Huot regarding using curl to check websocket servers at http://www.thenerdary.net/post/24889968081/debugging-websockets-with-curl curl -i -N -H “Connection: Upgrade” -H “Upgrade: websocket” -H “Host:...
HOW TO : Query varnishlogs for requests with 404 responses
varnishlog, one of the tools provided with varnish cache, uses VSL Query Expressions (https://www.varnish-cache.org/docs/trunk/reference/vsl-query.html) to provide some powerful insights into the requests and responses. Here is...
HOW TO : Enable wildcard domains in Squid
We were trying to modify some ACL (access control lists) in squid to allow traffic to certain websites. Instead of adding each individual hostnames in a...
HOW TO : Configure tcpdump to rotate capture files based on size
quick note for self. If you are capturing traffic using tcpdump, you can rotate the capture files based on size [code]sudo tcpdump -i INTERFACE_TO_CAPTURE_TRAFFIC_ON -C 10...