When to recalculate RecalculateIPChecksum ?

[rahmanian]

hello every one
I have some problems with my project using ntkernel
i ‘ve to change destination ip address , for example if some one requested a site with specific ip address i change ip packets destination ip header to 127.0.0.1
My code is like this :

IPAddress src_addr = new IPAddress(pIpHeader->Src);

IPAddress dst_addr = new IPAddress(pIpHeader->Dest);

IPAddress v_dst_addr = new IPAddress(new byte[] { 127, 0, 0, 1 });

pIpHeader->Dest =(uint ) v_dst_addr.Address;

but it dosent work
when i request a site in IE it cant event connect any where ! and all of my network cant work correctly when i start the program
what should i do ? does it need to recalculate the ip checksum ? or something else ?
please help me to solve this problem

thank you very much

[Vadim Smirnov]

Using 127.XXX.XXX.XXX for redirection is senseless because in Windows such packets never reach NDIS level. You should use local real IP address instead.

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