Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!ucsd!ucbvax!PARK-STREET.BBN.COM!brescia From: brescia@PARK-STREET.BBN.COM (Mike Brescia) Newsgroups: comp.protocols.tcp-ip Subject: Re: Host-down redirects? Message-ID: <8809040911.AA20869@ucbvax.Berkeley.EDU> Date: 2 Sep 88 14:48:44 GMT References: Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 31 ... SIMTEL20 came back online after being down for 18 days ... activated duplicate logins on our sister site ... Logical addressing is what you might use to direct connections to an alternate server. 1. Since tac connections are probably still done numerically by your users, you could educate them about opening connections by name if the name server version of TACACS is running. 2. For long-term (more than a week) outage, you could try changing your host table entry at your domain name server (or the NIC). Even hosts that use the NIC host table should eventually get the address change. 3. On an arpanet (e.g. the Milnet), the PSN's support logical addressing, both for X.25 and for 1822-AHIP. Your name server and host tables identify your address as a 'logical' one, such as 26.64.0.99, and you then can tell any one (or more) of your hosts to come up with that address. The problem with this solution is that there are no hosts that implement 1822-AHIP logical addressing. 4. If you were on an ethernet, you'd get logical addressing for free, and your host would have to act as multiple addresses on a single interface. ... the clever solution to this problem implemented at BRL ... Was this using ethernet addressing? Yours for logical networking, Mike