Router & Internet Bandwidth

Unanswered Question
Sep 10th, 2010
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I am using a 2811 router as my border router.  I have an Ethernet 100MB coming into it for my Internet from my ISP.  I am using an ASA5500 firewall to protect my networking and NAT is being done on that.  The 2811 is just a border router not doing NAT or anything else just routing traffic from the Fa0/0 interface to the fa0/1 interface.   If I test to the ISP's test site I get 90MB at local sites but 30-60MB to there remote sites.  They say this is due to windowing as the distance increases.  The 2811 seems to be running fine.  CPU is 20% during the day and drops to almost 0 at night.  Memory is 6%.


Could the reason I am not seeing higher through put the 2811?  Should I be using a beefer router?

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Giuseppe Larosa Fri, 09/10/2010 - 12:55
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Hello HMidkiff,


>> If I test to the ISP's test site I get 90MB at local sites but 30-60MB to there remote sites.  They say this is due to windowing as the distance increases.


ISP stuff is probably right: TCP goodput depends on the BW delay product


see

http://www.psc.edu/networking/projects/tcptune/


to be noted TCP window is negotiated between endpoints and does not involve network devices on he path.


Hope to help

Giuseppe

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