On Fri, Jan 14, 2000 at 06:42:01AM -0600, Chad W. Skinner wrote:
> I am trying to stop all unrequired services and was wondering if
> anyone could tell me what the following services are and if they need
> to be running.
> raw icmp 1
> raw tcp 6
These are not "ports". These are raw protocol numbers. All TCP
is IP type 6. All UDP is IP type 17. Repeat after me - these are NOT
ports. Blocking port 6 will have no effect on protocol type 6.
> Also, what are the following used for and are they required for
> telnet or httpd and eventually ssh.
> tcp auth 113
Auth (or ident as it is sometimes called) is a port to user mapping
service. You connect to a server (say smtp or ftp or telnet) that service
may try to connect back to your "auth" service with the peer address and
ask it "who is on this socket". Auth would then respond with your user name.
Not all servers do this and not all auth services are truethful, so no-one
relys on auth. If you block it, however, you may find some services extremely
slow to respond (set it to reject at your firewall if you don't want it).
> tcp sunrpc 111
> udp sunrpc 111
This is the RPC portmapper. You need this if you are doing any nfs.
Services trying to locate the mount or nfs rpc services will first contact
portmapper to determine what port the registerred services are on.
> Thanks,
> Chad
Mike
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