Messages in this thread |  | | Date | Thu, 16 Nov 2000 18:18:40 +0100 | From | Andi Kleen <> | Subject | Re: Setting IP Options in the IP-Header |
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On Thu, Nov 16, 2000 at 11:11:45AM -0600, Nishant Rao wrote: > Hi, > > We are conducting some research that involves setting our custom data as > a new IP option in the IP header (in the options field) of every packet. > > We have poured over the source code but it is quite confusing to figure > out how the details of the way the options field is split among various > options (ie. offsets etc). Can anyone help us figure out how to add new > custom options into the IP header ?
man ip(7), see the IP_OPTIONS socket option.
Linux only echoes received options, but never sets them by default unless that socket option is specified. So it depends on the application and/or the sender.
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