Problem with Accessing Website --


I'm a network engineer administering a network with approximately 500 - 600 hosts. The majority of our customers are based in China and our network is located here in the United States. Network connectivity and Internet access is good overall. However, our customers in China have trouble accessing the website from our network. The access time to the website is very slow during the peak operational hours of our network, which is about 12:00pm - 5:00pm China Standard Time. Here are a few things to note:

-- Latency to the website is about 160ms, which is good
-- Access to the website is good during Pacific Standard Time, when China is sleeping.
-- Access to the website is good from other collocation providers such Krypt during China peak hours even though latency is higher around 200ms.

Solutions Tried:

-- Adjusting the MTU on the servers to 1492
-- Adjusting the maximum segment size on our switches to 1400 using ip tcp mss 1400. We use Cisco 3550 switches.

Still, we haven't had much success in improving access to the website during China's peak hours. I now find myself posting on this website because I'm out of ideas. Any ideas, solutions, tips on this issue will be much appreciated. Thank you.

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Well, if you can access the site fine outside of China's peak hours, then MTU/MSS settings should have nothing to do with it.

If the only problems are during China's peak hours using your ISP, then I would assume that your ISP has a bandwidth capacity issue to China and there is not much you can do directly about that.  You can tune all day, but if their link is saturated, you can't do anything about it.

You need to contact your ISP and let them know.

As I don't know where Krypt, you may want to contact them and find out how they connect to the Internet and see if you can get the same ISP as they have.

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