Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
I have a small anonymizer service on the web , I have a squid server listening on 127.0.0.1 port 3128. and a ssh server which users connect to it and use it as a tunnel to connect to squid server. very simple setup.
recently I have encountered a problem I have no idea how to solve it. one or some of my users are infected by a worm , and they start to send lots of request for big zip or wmv files through ssh tunnel to my squid server. and it causes my incoming traffic to go very high. in fact it is a ddos attack. but I can not know which user or IP is attacking , because they come from ssh tunnel and in squid log all of requests come from IP 127.0.0.1 like this :
1176020701.378 12063 127.0.0.1 TCP_MISS/200 109973 GET h**p://a1327.r.akareal.net/ondemand/7/1327/2110/973023381/voice.download.akamai.com/2110/wm/voa/nenaf/pers/video/PERSIAN_LATEEDITION1830v0407.wmv? - DIRECT/188.8.131.52 application/octet-stream
I already have the SSH log , you mean to check when a user is connected and then check the time of start of attacks ? I have many users , so in 5 minutes could be lots of logins. also I can not be sure the attacker starts to attack in the exact time which he is connected , may be it starts to attack some minutes after connnecting. isnt there a more reliable solution ?