Re: Name Server for Local Site.


Bill Nowicki (nowicki@Sun.COM)
Wed, 13 Jul 88 18:18:01 PDT


        I am looking for a machine to act as a name server for our
        local site. We have a large, diverse number of machines
        running TCP/IP. (e.g. IBM, HP, SUN, Apollo, PC, VAX) over our
        local Ethernet.

There is no reason you need to FTP sources and compile, unless you have
lots of spare time (or expect the experience to be educational). The
Domain Name Server has shipped for almost two years as part of the
basic Sun Operating System (since SunOS 3.2). The version in SunOS
4.0, which has been shipping for several months, is based on BIND
4.7.3. The current release under development is based on BIND 4.8.
You can obtain an up-to-date version of BIND 4.8 through Sun customer
service (ask for the "name server kit" patch tape).

Yellow Pages is another network name service that Sun, DEC, HP, and
some other vendors are using to name users, groups, aliases, etc. in
addition to machines. This is in standard SunOS, PC-NFS, Ultrix 2.0,
plus others. There is a mechanism that causes the YP server to
optionally use the domain name resolver to look up names outside of the
current domain. Unfortunately this was broken in SunOS 4.0; the fix is
in the name server kit.

While I am at it, let me address a few of the other issues recently
discussed on the TCP-IP list. Regarding ARPs: the 0.x.y.z request is an
artifact of the old software you are using. SunOS 4.0 got rid of the
Network Disk protocol entirely and uses NFS for booting. ARPs for self
serve two purposes: warn you if someone else on the net is also set to
your IP address, and more importantly flush the caches of other people
on the net with your previous Ethernet address. Remember DECnet (and
sometimes XNS) requires you to change your Ethernet address. You need
this ARP or else your server will continue to send to the old address
when you reboot.

The current release in development has a simple timer that limits
ARP broadcasts to one per second. It also has NFS timers that are
automatically determined instead of requiring a user to guess at them.
Most NFS implementations already have exponential backoff.

On broadcasts: our solution: accept all six kinds of broadcasts, but
default to SENDING the old one (net.0 or net.subnet.0) until we can be
reasonable assured that all SunOS 3.2 or earlier systems are gone.

        -- Bill Nowicki
           Sun Microsystems



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