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Comcast DNS/POP performance question

Resending because I used 'x' instead 'n' for the ips below and the 
mailing list software thought it was obscene content!  ;-)

Since Comcast uses a single hostname for their POP server, are they 
doing a DNS trick to route regional traffic to different IP addresses 
for multiple POP servers?  e.g.  Boston's resolves to 
nnn.nnn.nnn.1 and California's resolves to nnn.nnn.nnn.2, etc... Or are 
they really using a simple powerful POP server to handle all the traffic 
for  I ask this because if they are doing a DNS trick and 
you don't use their DNS servers, performance can suffer.  Anyone know 
the facts?

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