At 16:02 18/09/01 -0500, you wrote: > > > > Do you use iptables or ipchains, i.e. any kind of NAT, in your machine?? > >I am pretty new at linux Marcos, i know iptables and ipchains are scripts but >I am not sure of their uses. Can you clarify that? Iptables and ipchains are programs that enables packet filtering, i.e. allows you to choose what kind of traffic is allowed from/to your machine. They are commonly used to build firewalls because they allow you to choose the services on your network that you want the outside world (usually the Internet) to access and prevent internal services from being accessed from the outside. NAT stands for Network Address Translation. There basically two types of NAT: Source NAT and Destination NAT. Source NAT (SNAT) is used so that the traffic from all the machines on your network going to another network (in most cases, Internet) can be seen (from the perspective of an outsider) as it came from a fixed machine (usually, your firewall), i.e. with the same source address. Destination NAT (DNAT) on the other hand is used when you have one machine (usually your firewall) that receives connections, filter then based on the services you want to provide access to, such as www, ftp, smtp, ssh, dns and redirects these connections to other internal machines. Do you know if there is any firewall installed on your network? If you have one, you must certify yourself that it enables access to TCP port 22 on your machine. If you´re not the network administrator, you must talk to him first. Then, we can continue discussing this matter ... -- Marcos Moura
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