Don Bowman wrote: [ ... ]
Shouldn't the stack ARP for the destination in my 'sendto', and fill in the ether header?
By using SOCK_RAW, you are bypassing the IP layer (or PF_INET, whatever you wish to call it), which I think means that you are also bypassing the ARP lookup code which normally would do so.
The ether-source is filled in, presumably by the driver.
Yes, and probably recomputing the frame-level checksum, but that's about it. When using raw sockets, one should try to pass in a packet that is completely filled in. I've found using libnet (in ports as net/libnet) is a pretty reasonable way of constructing packets, if need be: you build a packet one ISO layer at a time, and it will fill in the things not being handled when using SOCK_RAW.
Oh, if it's easier to swap sender and dest addresses within an existing packet, say for ICMP ECHO_REQUEST :-), by all means do so. Still, libnet and libpcap play nicely together.
Is the problem that you don't know or have the MAC addr of the destination handy?
-- -Chuck
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