Re: icmp: type-#69 (catched that bastard)
Cristian Ionescu-Idbohrn <firstname.lastname@example.org> writes:
>> How many hops away is the supposed source if you traceroute to it and how
>> does that compare to the 17 the above would imply?
> How did you work the 17 out?
I assume that the box's OS is setting to the nearest power of two by
default and that it's being decremented by one per router en-route as
normal. In this case, (- 128 111) is 17 :)
> Here's the traceroute:
> 1 x.y.z.1 (gateway@my ISP) 25.604 ms 23.43 ms 24.26 ms
> 16 126.96.36.199 (188.8.131.52) 284.126 ms 280.547 ms 287.283 ms
> 17 184.108.40.206 (220.127.116.11) 405.897 ms 287.745 ms 284.2 ms
> 18 18.104.22.168 (22.214.171.124) 284.638 ms 282.311 ms 299.727 ms
> 19 126.96.36.199 (188.8.131.52) 603.76 ms 649.345 ms 653.241 ms
OK. Either we have asymmetric routing or that packet is spoofed from
something that's really 17 hops away in order to get your network (hence
the broadcast) to attack a box that's really 19 hops away. Or the box is
emitting dodgy packets itself (less likely).