Date: Wed, 31 Mar 1999 10:26:31 -0800 From: Tom Brown <tomb@heliox.com> To: Christopher Sedore <cmsedore@mailbox.syr.edu> Cc: Graham Wheeler <gram@cdsec.com>, hackers@FreeBSD.ORG Subject: Re: How do I write to the /dev/bpf0 interface? Message-ID: <370268D7.68012311@heliox.com> References: <Pine.SOL.3.95.990331111409.7245B-100000@rodan.syr.edu>
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So my supposition that I could write to it like any other file handle was correct ? So I can just write the following to the interface for example: ddddddddddddXXXXXXXXXXXXiiiiiiiiiiiiiiiiiiiiiiiiiii..... d=destination address X=don't care i=information Bash# ethergenerator.pl>/dev/bpf0 Is that correct? What happens if I want to put in a source MAC address? You also mentioned that it might be a bug with 2.2.8, which combination's of card / operating systems might work? Thanks again for your time. Tom Brown Christopher Sedore wrote: > > On Wed, 31 Mar 1999, Graham Wheeler wrote: > > > Christopher Sedore wrote: > > > > > > On Wed, 31 Mar 1999, Graham Wheeler wrote: > > > > > > > Tom Brown wrote: > > > > > > > > > Can anyone please tell me how to post a packet onto my LAN via this > > > > > interface. > > > > > > > > You should just be able to write the frame. Make sure everything is in > > > > network-byte order. You needn't put in a source Ethernet address as that > > > > will get filled in, but you do need to put in a destination. > > > > > > Note that this is probably a bug in the bpf implementation. BPF/the > > > kernel shouldn't be messing with the packet on a write to a bpf > > > descriptor. I've filed a bug report (with patch) that addresses this. > > > > > > > It probably isn't the bpf code that is doing this, but the NIC driver > > code... > > Actually, its a cooperative effort by bpfwrite() and ether_output(). > > -Chris To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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