[c-nsp] round-trip differences towards google

[David Freedman]

Rens wrote:
> Hi all,
> 
>  
> 
> I'm having some difficulties understand some round-trip difference on the
> same router just by changing the source interface:
> 
>  
your source address will of course become the destination address which
google's equipment will want to send the ICMP replies back to, google's
return routing will dictate the path latency.

Dave.