pppoesk is a small program that can terminate
bogus PPPoE sessions by sending a forged PADT
(terminate) packet to the ISP equipment. PPPoE is
used in DSL connections to establish a link
between you and your DSL provider.
Ipdecap can decapsulate traffic encapsulated within GRE, IPIP, 6in4, and ESP (IPSEC) protocols, and can also remove IEEE 802.1Q (virtual LAN) headers.
It reads packets from a pcap file, removes the encapsulation protocol, and writes them in another pcap file.