> Its capture file editor, bittwiste, allow you to change most fields > in Ethernet, ARP, IP, ICMP, TCP, and UDP headers and you can specify > your own payload. It is possible for the payload to cover the ICMP, > TCP, or UDP header itself (checksum is corrected > automatically). Tcprewrite (part of Tcpreplay suite) allows you to > change src/dst MAC/IP/port only, but, it supports VLAN frames > (Bit-Twist does not).
I haven't tried either one of these, but will note that my favorite program in this space - if one wants to hack interactively - is "netdude", which is available from sourceforge. FWIW. allman
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