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From: Peter Howlett <Peter.Howlett@ASG.unb.ca>
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: Fri, 15 Mar 1996 23:40:45 +0000
Organization: Atlantic Systems Group
Lines: 52
Message-ID: <3149FFFD.41C67EA6@ASG.unb.ca>
References: <4ia1rs$1j1@sol.sun.csd.unb.ca> <p4trqukut.fsf@lpbcsun.lpbc.jussieu.fr> <DoC1x4.A7x@mail.auburn.edu>
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Doug Hughes wrote:
>
> In article <p4trqukut.fsf@lpbcsun.lpbc.jussieu.fr>, slt@lpbcsun.lpbc.jussieu.fr (Stephane Tsacas) writes:
> |> I've got it... :
> |> adb -k /vmunix /dev/mem
> |> physmem 3fb1
> |> le_softc/X
> |> _le_softc:
> |> _le_softc: ff005000
> |> 0xff005000+0t112/X
> |> 0xff005070: 8002071
> |> 0xff005074: d5010000
> |>
> |> First component of struct le_softc is a struct arpcom which starts by:
> |> struct arpcom {
> |> struct ifnet ac_if; /* network-visible interface */
> |> struct ether_addr ac_enaddr; /* ethernet hardware address */
> |> struct in_addr ac_ipaddr; /* copy of ip address- XXX */
> |> ...
> |>
> |> and sizeof(struct ifnet) = 112
> |>
> |> Don't ask me if the machine has more than one interface...
>
> 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)
Actually, upon looking at TCP/IP illustrated Vol 2 (which SunOS
obviously is not quite the same as, but close to) the le_softc
struct is a wonderful place to find the forbidden fruit of the
ifnet struct (wish there was an ioctl for this...) arpcom would
be great to since it comes right after le_softc. But, as was
mentioned in a previous post, what if there are more than one
ethernet card in this SunOS machine I am working on? Is there a
separate le_softc for each card? (I am on a Sparc 20 clone AXIL
with le0 and le1)
Turns out, I got a mail message from a fellow who mentioned the
sysinfo program from usc.edu which tells just about everything
there is to know about a SunOS, Solaris, HPUX, AIX, IRIX machine.
It's quite impressive although I have not actually traced to
find out how it gets the MAC address yet. (Seems to probe the
prom directly?)
Many thanks for the responses....
--------------------------------------------------------------------
Peter Howlett Atlantic Systems Group
E-Mail: Peter.Howlett@ASG.unb.ca Fredericton, N.B. Canada
http://www.ASG.unb.ca/personal/ph.html Phone: (506) 447-3050
PGP Key ID: 60F2EEC1 Fax: (506) 453-5004