Hello All and thanks Jeff, Gene, Arthur, .... all others who helped solve my doubts. Now I understand and realise that my earlier fears about fork bombing are unfounded. Jeff Kinz <jkinz@xxxxxxxx> wrote: > Does your home network look like either of these two configurations? > setup A: > Internet single > cable/DSL--------------------------- Computer > device This is my setup and how can i protect this home PC from unauthorised access *via the internet* ? I have 2 harddisks, one for Linux (use Fedora core 1) and another for Windows. 1] Is a firewall software a default setup in Fedora ? How will I know or find if it is running on my machine ? 2] You mentioned that iptables or ipchains firewall software can be setup using 1 ethernet NIC card. If fedora has a default firewall software do i still need to do so ? Also, there are only two users on this PC so unauthorised access (if any) will only be via the internet. Gene, where to find resources for statefull filtering by blocking ports, as mentioned earlier. How does one go about it ? Scot, you had mentioned locking unused printer ports, etc.. How can i do that, do suggest other online resources. Jonathan Berry <berryja@xxxxxxxxx> wrote: > If you are not using it, I would suggest that you disable sshd. It > allows you to login remotely (read over the internet). As long as you Using a GUI tool (forgot the name), as root, i have disabled in and outgoing telnet, incoming ssh (same as sshd?) and rlogin after reading it was unsafe. Do i need to do that for each user seperately ? Among other precautions, we *dont* access the internet via Windows and when logged in as root on Linux. Please tell me if my PC is reasonably safe ? thanks, MR