On Thu, 11 Jul 2002, Dan Sabo wrote: > I'm co locating my new server loaded with red hat Linux 7.2 tomorrow. The > co lo facility tells me that I can not have one IP address for each and > every domain name unless I can justify them; and some I can justify and some > I can't. > > What I'm wondering, what if anything will I lose if I set up domains under > (I guess they are called) virtual IP address, instead of assigning them a > real IP address? Are there any advantages or dis advantages of setting up > domain names without a real IP address?
First of all, there are no virtual IP addresses, only public and private ones. RFC1918 describes the justification for private IP addresses and defines their values (10.xx.xx.xx, 172.16.xx.xx-172.31.xx.xx, and 192.168.xx.xx). Public IP addresses are the only ones that are any good on the global internet; private IP addresses are very useful on private networks, from a 2-host SOHO net to a large enterprise network behind a firewall. Public IP addresses are in short supply (thus your ISP's reluctance to hand them out) and must be assigned by a global administration to other local administrations. Private IP addresses are not routable to the public internet, but assigned and controlled as the private network administrator sees fit. Perhaps what you are really facing is having to define virtual domains. I don't have any direct experience with them, but my understanding is that multiple domain names resolve to the same public IP address. The major drawback I see, is for example, if "myneatdomain.com" and "xyz.org" both resolve to IP address 209.71.55.131, a web server at that address couldn't tell the difference between requests for http://myneatdomain.com/index.html and http://xyz.org/index.html. It is possible to have a single SMTP server handle mail for multiple domains by having many DNS MX records point to the same address. I don't know how difficult setting up sendmail, qmail, or postfix (the only mail transfer agents, MTAs, I know of). Perhaps others could comment on that. Jim Cunning _______________________________________________ Redhat-list mailing list [EMAIL PROTECTED] https://listman.redhat.com/mailman/listinfo/redhat-list
