[BBLISA] Amazon EC2 Oddly Rejecting Very Specific IP Addresses

[Dean Anderson]

Good point.  tracepath also gets around some issues by sending a large 
packet and looking for fragmentation required responses. 

Nobody _ought_ to be blocking the frag required response, as that breaks 
path mtu. Actually, there are others they shouldn't block:

http://www.av8.net/ICMPTypes.txt

		--Dean


On Tue, 13 Apr 2010, Brian O'Neill wrote:

> Note that Windows tracert by default does an ICMP ECHO traceroute (and 
> really has no other options), whereas UNIX/Linux traceroutes by default 
> use UDP. To get the Windows effect on Linux, you need to run "traceroute 
> -I" as root.
> 
> So if the router is blocking ICMP at some level, a Linux traceroute may 
> still work.
> 
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