I haven't seen a single network stack that doesn't limit the size of the tailing payload or packet in general (MTU's ;)), go try and push 65507 bytes of payload into the message and tell me how it goes.
In any case DNS tunnel offers you both TCP and UDP tunneling at much higher throughput, I'll take a look at your code when I'll have the time and see how it compares to ptunnel or ICMP shell.
In any case DNS tunnel offers you both TCP and UDP tunneling at much higher throughput, I'll take a look at your code when I'll have the time and see how it compares to ptunnel or ICMP shell.