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List:       kernelnewbies
Subject:    Re: Changing the source IP of outgoing UDP packets on a socket
From:       Kashif Shaikh <k2shaikh () yahoo ! com>
Date:       2003-01-29 5:11:38
[Download RAW message or body]

Ok, I'm going to try answering both your responses Seth and
Sridhar:(I'm not at work, so I'm using my yahoo account).

>Quoting Seth Arnold <sarnold@wirex.com>:
>> 
>> Does the bind(2) system call do what you need?
>> 
Thanks seth,

My fault for not understanding bind fully, until I read the man 7
socket: "...connect(2) connects a socket to a remote socket address,
and bind(2) function binds a socket to a local socket address".   So
yes, bind(2) is what I needed.

>Quoting sridhar vaidyanathan <sridarv@ufl.edu>
>There is a type called SOCK_PACKET which you can specify when you
>create >the 
>socket.Using this you can create your own packets also. 
>try reading up more information on this.

Actually you if I wanted to I could create a SOCK_RAW socket, and then
specify the IP header through IP_HDRINCL option.  I'm not sure if the
following applies to 2.4 kernels but raw(7) states: "In Linux 2.2 all
IP header fields and options can be set using IP socket options." 
Though I'll check out SOCK_PACKET.

>-sridhar

Thanks for everyone replying,

This will help me implement virtual netbios hosts for samba registering
with WINS server or client Windows machines(extending the idea for
netbios aliases).

Kashif Shaikh


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