Re: Problems netbooting OpenBSD

Brandon Applegate <[email protected]> Wed, 2 Dec 2015 00:38:07 -0500
Newsgroups	gmane.os.openbsd.sparc
Message-ID	<[email protected]>
> On Dec 1, 2015, at 6:23 PM, Stuart Henderson <[email protected]> wrote:
> 
> On 2015/12/02 00:00, Adrian Christiansen wrote:
>> Hi guys!,
>> 
>> I'm trying to install OpenBSD on my SPARCstation IPX, from a PC
>> running OpenBSD/i386 5.8-current as of Sunday. When I got the SUN the
>> PROM was dead so I've piggy backed a new battery and a new MAC have
>> been set. Before attempting to install OpenBSD the machine was
>> installed with NetBSD over the network from a PC running Debian, using
>> tftpd-hpa, rarpd and the kernel nfs-server.
>> 
>> It seems like the IP 10.0.0.10 is set OK via rarp, based on that the
>> file 0A00000A.SUN4C is being requested. However that seems to be as
>> far as it gets. After this it is in an endless loop sending a new
>> request over and over. tftpd sends the first block of boot.net binary,
>> doesn't get a response and tries this five times before the SUN gives
>> up and sends a new request. If I tftp localhost I can get the
>> 0A00000A.SUN4C file without any issues.
>> 
>> The PC's NIC dc0 is set to: 10.0.0.1, 255.255.255.0, 10.0.0.255.
> 
> This may be connected with netmask.
> 
> RARP can't set the netmask, it assumes the classful netmask for the
> address range used. For 10.0.0.0 this is in class A so it's a /8 or
> netmask 255.0.0.0.

Hmm, I don’t think the netmask would cause this.

If the PC is 10.0.0.1/24 - then 10.0.0.10 is indeed within that subnet.  As you said - the IPX is using /8.  So even though the netmasks on each machine don’t match - they still agree that each other is on the wire.

If the IPX was 10.0.1.10 for example - then your PC would NOT believe he was on the wire and therefore need a (default) gateway to send packets back to him.

--
Brandon Applegate - CCIE 10273
PGP Key fingerprint:
830B 4802 1DD4 F4F9 63FE  B966 C0A7 189E 9EC0 3A74
"SH1-0151.  This is the serial number, of our orbital gun."
signature.asc (application/pgp-signature, 842 B)