TCP IP Illustrated

Uunet connected to ftpuunet 220 ftpuunet ftp server

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Unformatted text preview: uting table entry on sun that directs datagrams for to the router bsdi. (Recall our discussion of this routing table in Section 9.2.) Our host slip is still reachable across the Internet, because we saw in Section 10.4 that the routers gateway and netb just sent any datagram destined for the subnet 140.252.13 to the router sun. Our router sun knows what to do with these datagrams from the routing table entry we made in step 3 above. What we have created is a host with complete Internet connectivity, but without a valid domain name. That is, a pointer query for the IP address will fail. We now use anonymous FTP to a server that we know requires a valid domain name: slip % ftp Connected to 220 ftp.UU.NET FTP server (Version 2.0WU(13) Fri Apr 9 20:44:32 EDT 1993) ready. Name ( anonymous file:///D|/Documents%20and%20Settings/bigini/Docum.../homenet2run/tcpip/tcp-ip-illustrated/ftp_file.htm (22 of 24) [12/09/2001 14.47.49] Chapter 27. FTP: File Transfer Protocol 530- Sorry, we're unable to map your IP address to a hostname 530- in the DNS. This is probably because your nameserver does not have a 530- PTR record for your address in its tables, or because your reverse 530- nameservers are not registered. We refuse service to hosts whose 530- names we cannot resolve. If this is simply because your nameserver is 530- hard to reach or slow to respond then try again in a minute or so, and 530- perhaps our nameserver will have your hostname in its cache by then. 530- If not, try reaching us from a host that is in the DNS or have your 530- system administrator fix your servers. 530 User anonymous access denied.. Login failed. Remote system type is UNIX. Using binary mode to transfer files. ftp> quit 221 Goodbye. The error reply from the server is self-explanatory. 27.4 Summary FTP is the Internet standard for file transfer. Unlike most other TCP applications, it uses two TCP connections betwe...
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