Question

hello. I want to look at where and how much router fragment packets (fragmentation packet counter). How I may do this?

Google show answer as: "netstat -s", but this does not work in RUTX.

Firmware: 7.4.3

Answer 1

Hello,

I did not find much in this regard. You can find some details with the following command:

• cat /proc/net/snmp | grep Ip

The last three columns of the output seem to be related to fragmentation counters.

The command:

• cat /proc/net/sockstat

has a line with FRAG, which apparently displays the number of fragmented packets currently in use and some memory usage.

If you are interested in capturing fragmented traffic, TCPdump can be used with the following command:

• tcpdump -i wwan0 -nnvvS 'ip[6] & 0x20 != 0 or ip[6:2] & 0x1fff != 0'

It captures packets with More Fragments flag set or packets, where the fragment offset is not zero.

Best regards,