> In Ipv6 we have Authentication Header as extension header, is > there any option in IPv4 like this (I mean that is equal as AH in > IPv6). If this is not the right place to ask , please tell me in > which group i can post this question. AH is part of IPsec, which is implemented for both IPv4 and v6. See http://www.freeswan.org/ for the IPv4 IPsec implementation for Linux. freeswan is the basis for the USAGI IPv6 IPsec implementation. noah
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