[c-nsp] round-trip differences towards google

[Rens]

They both leave my network via the same IP transit but then afterwards some
hops are different...

-----Original Message-----
From: E. Versaevel [mailto:erik at infopact.nl] 
Sent: mercredi 8 juillet 2009 12:45
To: Rens
Cc: 'David Freedman'; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] round-trip differences towards google

Is there a difference when you traceroute with different source ip's ?

Rens schreef:
> I expect the return routing to be the same as for all my IP addresses
since
> they are all advertised in the same way.
> 
> I guess google doesn't handle them the same way?
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of David Freedman
> Sent: mercredi 8 juillet 2009 12:21
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] round-trip differences towards google
> 
> 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.
> 
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Erik Versaevel