Re: set source addr of a IP packet

[Neil Horman <nhorman@redhat.com>]

Thanh Tra LUU wrote:

> Dear all,
>
> Tell me if there is a way to send a packet whose IP address is chosen (by
> us, for example ipspoofing) that does not use the IP_HDRINCL option.
>
> It is quite strange to me when I read the source code of RSVP ISI, they
> don't use the IP_HDRINCL for sending Path messages whose source address must
> be the sender's address. I found that the source address is the interface
> address through which Path message is sent. Maybe I mistook.
>
> Thanks,
>
> Nary Tra
>
>
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>  
You can use PF_PACKET sockets, and build the entire IP/[tcp|udp]/etc 
headers in user space.
Neil

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