Mercap/editcap: Files from that network type can't be saved in that format [solved]

Sometimes we do face problem in spilt/merge  packet captures taken in a different media. For example, if we capture packets in MAC operating system, we can't merge the capture files using mergecap utility. Because the files are not in libpcap format. When you try to merge/edit the files, you get the below error

Issue

mergecap  -w out.pcap VA123_00016_20170530202904 VA123_00016_20170530202905

mergecap: Can't open or create out.pcap: Files from that network type can't be saved in that format

file VA123_00016_20170530202904

VA989_00016_20170530202904: pcap-ng capture file - version 1.0

you can solve this issue with the help of tcpdump utility. With the help of tcpdump, you can convert the pcap-ng files to libpcap format 

tcpdump -r  VA123_00016_20170530202904  output.pcap

You can use the below script to merge the list of pcapng files into a single libpcap file

#!/bin/bash

for i in `ls`

do

    echo $i

    file=`echo $i | cut -d "." -f1`

    tcpdump -r $i -w $file.pcap

done

mergecap -w outputfile.pcap *.pcap