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Options field in Outer IP Header
Hi,
This is regarding the Options field in the outer IP Header for IPsec
Tunnel mode.
In RFC2401, section 5.1.2.1 gives the Header construction for Tunnel
mode. For the Options field, the following line has been printed.
Header fields Outer Header Inner Header
Options never copied no change
I have a doubt. Does this mean:
1> IPsec never copies the Options field from the inner Header nor
does it construct them for the Outer Header ?
2> IPsec always attaches an outer IP Header of 20 bytes ?
3> It is not the responsibility of IPsec to attach the Options field for the
Outer IP header ?
I would be really thankful if you could help me with this.
Thanks and Regards,
Amol.