Date: Fri, 15 Aug 2003 07:15:00 -0700 From: Lars Eggert <larse@ISI.EDU> To: Nick Barnes <Nick.Barnes@pobox.com> Cc: freebsd-net@freebsd.org Subject: Re: Translate MAC address to IP address Message-ID: <3F3CEAE4.3060108@isi.edu> In-Reply-To: <75602.1060946037@thrush.ravenbrook.com> References: <75602.1060946037@thrush.ravenbrook.com>
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This is a cryptographically signed message in MIME format. --------------ms050909070902020907050508 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Nick, Nick Barnes wrote: > At 2003-08-13 15:43:51+0000, Lars Eggert writes: >>Nick Barnes wrote: >>> >>>I have some MAC addresses from a local Ethernet segment. I want to >>>convert them into IP addresses. How can I do that programmatically? >> >>net/arping from port: > > Thanks for the reference. I had a look at arping. It works by sending > a broadcast ping to the specified MAC address (not to the broadcast > MAC). I note that FreeBSD machines do respond to such pings (unlike > regular broadcast pings), but some machines do not (e.g. WinXPPro, > NT4). it also supports setting the source IP and MAC address to one specified on the command line. This usually works for these other boxes, if you use a valid one for the net you're on. > Since asking the question, I have been rummaging around in user-space > network code (e.g. in the sources for arp, ping, and ifconfig) and > have written a couple of little utilities: ... > I can provide sources on request any time; once these things are a bit > more polished I will put them on the web. Interesting! Maybe turn them into a port once they're stable? Lars -- Lars Eggert <larse@isi.edu> USC Information Sciences Institute --------------ms050909070902020907050508 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJtjCC AzgwggKhoAMCAQICEGZFcrfMdPXPY3ZFhNAukQEwDQYJKoZIhvcNAQEEBQAwgdExCzAJBgNV BAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgG A1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2Vydmlj ZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkG CSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMDA4MzAwMDAw MDBaFw0wNDA4MjcyMzU5NTlaMIGSMQswCQYDVQQGEwJaQTEVMBMGA1UECBMMV2VzdGVybiBD YXBlMRIwEAYDVQQHEwlDYXBlIFRvd24xDzANBgNVBAoTBlRoYXd0ZTEdMBsGA1UECxMUQ2Vy dGlmaWNhdGUgU2VydmljZXMxKDAmBgNVBAMTH1BlcnNvbmFsIEZyZWVtYWlsIFJTQSAyMDAw 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