From: "prashant singh" <[EMAIL PROTECTED]> > 1. Can we change the default port binding to a > particluar service for more security like changing the > default port of telnet which is 23 to say 1024?
Sure. You'll have to hack telnetd (the telnet daemon) to listen at port 1024. In all probability, you can probably change it by changing telnetd's configuration. Remember that your telnet client would have to telnet to port 1024 and not 23. In reality this is not security. It is obfuscation. > 2. Can a Linux machine or any machine for that matter > work without a loopback interface(lo) defined in its > kernel or relevant networking files? Why? The loopback interface does not take space or resources worth mentioning. In theory it should be possible. But in practice there would be services on your machine which assume loopback is present. > 5. What is the need of ip addresses in an > internetworking system if MAC addresses can be > uniquely used to indentify a particular machine or an > interface? What about a machine whose network cards fails for some reason? When you replace the network card, there is a new MAC address. If there were no IP addresses, this would mean that people would be trying to reach the old MAC address (while your DNS changes are propogating). Also, what about machines that connect to the internet through something other than an ethernet card? Let us say I have a machine that uses a token ring card. Or what about when I dial up into my ISP through a modem. A modem does not have a MAC address as far as I know. Thaths ------------------------------------------------------- Sponsored by: ThinkGeek at http://www.ThinkGeek.com/ _______________________________________________ linux-india-help mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/linux-india-help
