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packet forward

hi,
    I want to forward an ICMP packet(using netfilter hooks)that I
receive
 from ping.For this Iam following these steps:
 
       1.Change the destination IP of the packet in the IP header.
 
       2.Recalculate the checksum of the IP header and fill it.
 
       3.change the /proc/sys/net/ipv4/ip_forward to 1
 
 Are these steps complete and correct?Please correct me if Iam wrong.
 
 Thanks in advance.
 regards-
 krishna.


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