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- Path: sparky!uunet!dtix!darwin.sura.net!mips!swrinde!elroy.jpl.nasa.gov!ames!sgi!rhyolite!vjs
- From: vjs@rhyolite.wpd.sgi.com (Vernon Schryver)
- Newsgroups: comp.sys.sgi
- Subject: Re: loading miniroot over several gateways
- Message-ID: <o02jkk8@rhyolite.wpd.sgi.com>
- Date: 31 Jul 92 14:30:01 GMT
- References: <stefans.712566348@bauv106> <1992Jul31.104823.22182@comp.bioz.unibas.ch>
- Organization: Silicon Graphics, Inc. Mountain View, CA
- Lines: 54
-
- > In article <stefans.712566348@bauv106>, stefans@bauv106.informatik.unibw-muenchen.de (Stefan Schwarz) writes:
- > It seems, the problem is within the network. I have to pass
- > several gateways to reach my load-host. But i don't know
- > whether my local machine has any information about routing when
- > working within PROM monitor.
-
- No, the PROM monitor knows nothing about RIP, GATED, or any other
- routing protocol.
-
-
- To remotely boot, the intervening gateways must be willing to forward
- both the initial RFC-951 "bootp" packets and the later TFTP UDP
- packets.
-
- No useful router has troubles with TFTP UDP. However, over loaded
- routers can drop too many packets to be "useful". It is not hard to
- overload routers today, including Ciscos.
-
- The most likely source of problems is in forwarding the initial BOOTP
- packets. Many routers do not forward BOOTP at all. Others, notably
- Ciscos as of a year or two ago, have different ideas from Silicon
- Graphics on how and when to forward BOOTP packets. The Silicon
- Graphics "Information/Services" organization has long preferred Cisco
- routers over Silicon Graphics boxes over the strenuous and bitter
- objections of Silicon Graphics' sales and engineering. For years the
- internal rule of thumb was that you must ensure that you have IRIS's
- acting as routers available to forward BOOTP and to gateway for timed.
- (No one, including the main SGI timed proponent, me, would expect Cisco
- to support the timed protocol, "TSP".)
-
- There are also problems if the machine from which you are booting is
- "multi-homed" or has more than one network interface, caused by
- disagreements between the client and the server over the server's
- hostname. We have improved that in IRIX 4.0.5. If this is the problem
- (unlikely), ensure that you are net-booting from the "nearest" alias of
- the server, possibly as in "gate-load-host" instead of "load-host".
-
-
- More recently, many people have found a somewhat inefficent but very
- easy and effective solution. Simply NFS mount the distant images on a
- nearby NFS server.
-
- WIth the advent of automount, this is as easy as:
-
- 0. install NFS everywhere
- 1. turn on automount on all nearby IRIS's
- `chkconfig automount on`
- `reboot`
- 2. boot specifiying the NFS images, as in
-
- local-server:/hosts/load-host/CDROM/...
-
-
- Vernon Schryver, vjs@sgi.com
-