std::cout << "IPIn::recv (" << ip << "): IPHeader: " << iph << "\n";
std::string tmp = buf.substr(iph.header_len());
std::cout << "\tdata (" << tmp.size() << ") = " << tmp << "\n";
std::cout << "IPIn::recv (" << ip << "): IPHeader: " << iph << "\n";
std::string tmp = buf.substr(iph.header_len());
std::cout << "\tdata (" << tmp.size() << ") = " << tmp << "\n";