So routers send ICMP messages about packets they pass on? Well, can't you just flood the target with ICMPs faked itrace-ICMPs, how exactly are the victim supposed to be able to tell which ones are real and which ones are not? And the routers can't really send these itrace-ICMPs about an ICMP, since there is this rule about not sending ICMPs about ICMPs, right?
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So routers send ICMP messages about packets they pass on? Well, can't you just flood the target with ICMPs faked itrace-ICMPs, how exactly are the victim supposed to be able to tell which ones are real and which ones are not? And the routers can't really send these itrace-ICMPs about an ICMP, since there is this rule about not sending ICMPs about ICMPs, right?