Rtdump is a version of tcpdump modified to capture traffic on remote systems and networks. It links to librpcap rather than libpcap. Apart from the additional requirements introduced by the remote capture paradigm, rtdump is identical to tcpdump in command syntax and use.
You can download it from the following link: https://packetstormsecurity.com/files/download/29912/rtdump-1.0.tar.gz
Source: https://packetstormsecurity.com/files/29912/rtdump-1.0.tar.gz.html