Packet status in Linux kernel
 

I will send packets through some packet generators like iperf, netpef.
Later I want to analyze status about the sent and received packets.
In Linux kernel from where I can get the status about sent and received packets?

You can cat any files under "/sys/class/net/eth0/statistics/", or using command netstat

You would have to have the nf_conntrack module installed so do:

modprobe nf_conntrack

and then do:

cat /proc/net/nf_conntrack

Thanks. I check with that.

I am having one more doubt.
In kernel, whether ip_fragment() in net/ipv4/ip_output.c is reentrant function or not?