I am basically NT Admin switched over to Linux.
Recently (Feb'2002), I converted my office network from Winnt Domain Network to Linux.
i)Winnt PDC replaced with SAMBA on Redhat LInux 7.2
ii)Msproxy 2.0 replaced with Squid HTTP Proxy on RH 7.2
iii)Oracle 8i on NT replaced with Oracle 8i on Redhat Linux 7.2
Everything is working smoothly with maximum load.
My Internet Gateway is running on Redhat
Linux 7.2 and I am using ISDN 64k Dialup Service to connect my office to internet. All the clients (win9x,NT Workstation 4.0) are connected to Internet through SQUID Proxy.
Right now My internet gateway is not protected with any antivirus softwre. So, I am getting all Internet Worms like w32@NIMDA.eml , w3@Klez.h . etc.
Moreover, my Samba log folders(/var/log/samba) on Internet Gateway shows some computer logs which was not existing in my network. Moreover, the size of the log file is 0k. All the client system has Mcafee Antivirus software. So, some have I am managing my network from virus attack.
My question is
i) Which is the best antivirus software for protecting my network?Is there any free software available for the same.(As of current finanacial situation my company dont have enough fund for buying the same). I can buy some commercial editions after 3 or 4 months only. So, pls recommend some good free stuff available on the Net?
2) I want to check who are all accessing my system. How they are accesing my resources, etc., (like security auditing in Winnt).
3) Moreoever, my Technical Support Team uses MSN Messenger Service, Yahoo Messenger Service to communicate to the clients in the different parts of the country. The problem is MSN Messenger is getting disconnected once in a 2 minute. How to prevent frequent disconnection of MSN Messenger Service in SQUID Proxy of Redhat LInux 7.2?
With Advanced Thanks
3) Whether my system is protected with