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From: mch@squirrel.com (Mark Henderson)
Newsgroups: comp.unix.questions,comp.unix.bsd,comp.unix.internals,comp.sys.sun.apps,alt.unix.wizards,can.sun-stroke,alt.sys.sun
Subject: Re: Interface MAC address SunOS 4.1.3
Date: 16 Mar 1996 06:21:36 GMT
Organization: RATATOSK
Lines: 76
Message-ID: <4idmlg$6nl@hustle.rahul.net>
References: <4ia1rs$1j1@sol.sun.csd.unb.ca> <p4trqukut.fsf@lpbcsun.lpbc.jussieu.fr> <DoC1x4.A7x@mail.auburn.edu>
NNTP-Posting-Host: squirrel.com
Xref: euryale.cc.adfa.oz.au comp.unix.questions:78968 comp.unix.bsd:16773 comp.unix.internals:9925 comp.sys.sun.apps:12818 alt.unix.wizards:3355 alt.sys.sun:10114
In article <DoC1x4.A7x@mail.auburn.edu>,
Doug Hughes <doug@eng.auburn.edu> wrote:
>Luckily, on Suns, there is only 1 MAC for all ethernets. The mac is
>stored in nvram on the motherboard, so you don't have to worry about this.
>(or unluckily, depending on your point of view)
Well, this is usually true.
The default MAC address for every ethernet interface is stored in
NVRAM. If you don't specify an ethernet address when initialising the
interface, you get the default.
However, you can change the default MAC address for an interface with
ifconfig or just specify any ethernet address you want in your startup
files.
e.g.
ratatosk# ifconfig le0 ether 8:0:20:1:2:3
ratatosk# ifconfig le0
le0: flags=63<UP,BROADCAST,NOTRAILERS,RUNNING>
inet 192.168.7.1 netmask ffffff00 broadcast 192.168.7.0
ether 8:0:20:1:2:3
If you are content to get the default ethernet address out of the
NVRAM, then you can do this via the openprom driver. For an example
see getobphostid.c in my change-sun-hostid package available from:
ftp://ftp.netcom.com/pub/he/henderso/change-sun-hostid.tar.gz
ftp://ftp.wimsey.com/pub/crypto/sun-stuff/change-sun-hostid.tar.gz
http://www.squirrel.com/squirrel/sun-stuff/change-sun-hostid.tar.gz
On the other hand, if you really want the real current MAC address of
le0 (for example), the following should do under Sun OS 4.1.x.
N.B. This code must be run as root
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <sys/time.h>
#include <net/nit_if.h>
main()
{
struct ifreq foo;
int i, j;
if ((i = open("/dev/nit", O_RDONLY)) < 0) {
fprintf(stderr, "cannot open /dev/nit\n");
exit(1);
}
strcpy(foo.ifr_name, "le0");
foo.ifr_addr.sa_family = AF_NIT;
if (ioctl(i, NIOCBIND, &foo) < 0) {
fprintf(stderr, "NIOCBIND failed\n");
exit(1);
}
if (ioctl(i, SIOCGIFADDR, &foo) < 0) {
fprintf(stderr, "SIOCGIFADDR failed\n");
exit(1);
}
for (j = 0; j < 6; j++)
printf("%02x ", foo.ifr_addr.sa_data[j]);
printf("\n");
}
e.g. the output on the machine I just executed the above ifconfig
commands on is: 08 00 20 01 02 03
--
Mark Henderson -- markh@wimsey.bc.ca, mch@squirrel.com, henderso@netcom.com
ViaCrypt PGP Key Fingerprint: 21 F6 AF 2B 6A 8A 0B E1 A1 2A 2A 06 4A D5 92 46
unstrip for Solaris, Wimsey cryptography archive, Wimsey TECO archive,
change-sun-hostid, Sun NVRAM/hostid FAQ - http://www.squirrel.com/squirrel