Daniel Hartmeier said:

> Since the ID is chosen randomly, it wouldn't make much sense to allow
> filtering based on it as criteria, so you can just watch the IDs. If you
> see more IDs like 256, 512, etc. (powers of 2), that means the sender is
> not generating them randomly, I guess.

Thanks to all for the very informative responses. I've c&p a few secs from
my pftop output below... (my IP addr = X). As I said most (I'm guessing
95% +) have the 256, 512, 768 or 1024 "ID Field" :).

Thanks,
Jay

icmp In  67.33.112.89:768      X:768                0:0               1   
 9     2   184
icmp In  67.33.159.163:512     X:512                0:0               8   
 2     2   184
icmp In  67.32.17.228:512      X:512                0:0              12   
 0     2   184
icmp In  67.30.41.245:768      X:768                0:0               3   
 7     2   184
icmp In  67.33.107.213:512     X:512                0:0               3   
 7     2   184
icmp In  67.32.213.95:512      X:512                0:0               4   
 6     2   184
icmp In  67.33.122.207:768     X:768                0:0               1   
 9     2   184
icmp In  67.34.243.82:1024     X:1024               0:0               1   
 9     2   184
icmp In  67.30.123.99:512      X:512                0:0               5   
 5     2   184
icmp In  67.30.19.226:768      X:768                0:0              12   
 0     2   184

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