Re: [9fans] Re: PPP error: cannot write IP - link not up

[erik quanstrom <quanstro@coraid.com>]

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On Tue Mar  6 04:55:44 EST 2007, vester.thacker@gmail.com wrote:
> On 3/6/07, Stevie_Lancaster <teenageriot@gmx.de> wrote:
> 
> > Thanks for your reply. Under /net there is already a directory ether0.
> > So I guess the device got binded there. Am I right?
> 
> I believe it to mean that the device was recognized, but it does not
> mean that it was binded.

i guess this is pedantic but, yes it does mean the device is bound
into the namespace and in most cases you can send and receive
raw ethernet frames.

i've attached an overly-complicated program which prints out the
ip configuration by interface.  output is like so:

	; ipifc
	0:/net/ether0 	00a0c973fa3f	1514
		205.185.197.2/120	205.185.197.0
	0:/net.alt/ether1 	000102ed3163	1514
		65.14.39.132/123	65.14.39.128

the first line is the ipifc index, a ':', the mountpoint, mac and mtu.
subsequent indented lines are  address, a '/', netmask and
network for each configured address.  you can get the same
information with

	; cat cat /net*/ipifc/?/status>[2=]

but it's a lot harder to read. ;-)

- erik

[-- Attachment #2: ipifc.c --]
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#include <u.h>
#include <libc.h>
#include <ip.h>

char *mtab[10] = {"/net", "/net.alt"};
int nmtab = 2;

void 
ipifcprint(char *m, int idx)
{
	Ipifc 	*ifc;
	Iplifc	*l;
	uchar 	eth[6];

	for(ifc = readipifc(m, 0, idx); ifc; ifc = ifc->next){
		print("%d:%s ", ifc->index, ifc->dev);
		if(myetheraddr(eth, ifc->dev) == 0)
			print("\t"	"%E", eth);
		print("\t"	"%d\n", ifc->mtu);
		for(l = ifc->lifc; l; l = l->next)
			print("\t" "%I%M" "\t" "%I\n", l->ip, l->mask, l->net);
	}

//	freeipifc(ifc);
}

void
usage(void)
{
	fprint(2, "usage: ipfic [-m net mtpt] [interface number] ...\n");
	exits("usage");
}

void
main(int argc, char **argv){
	char* r;
	int i, m;

	m = 0;
	ARGBEGIN{
	case 'm':
		if(m++ == 0)
			nmtab = 0;
		if(++nmtab < nelem(mtab))
			mtab[nmtab-1] = EARGF(usage());
		break;
	}ARGEND;

	fmtinstall('I', eipfmt);
	fmtinstall('M', eipfmt);
	fmtinstall('E', eipfmt);
	if(*argv)
		for(; *argv; argv++){
			i = strtoul(*argv, &r, 0);
			if (*r)
				usage();
			ipifcprint(mtab[0], i);
		}
	else
		for(i = 0; i < nmtab; i++)
			ipifcprint(mtab[i], -1);

	exits(0);
}