Slow VPN

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Feb 22nd, 2008
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I have a site to site VPN configured, when users access the Internet the response time is acceptable. When they access the main site's server resources the site drags. If they try to open up folders it takes a minute or two between each subsequent folder. On the main site, it is fine. I added a Host entry in the host table to determine if it was DNS, but that did not make any difference. This has been a chronic issue for months, and they are extremly frustrated.

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Joseph W. Doherty Sat, 02/23/2008 - 17:48
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If you're doing remote file access across a WAN, it's often noticeable slower than local LAN access due not only to usually much lower bandwidth but additional latency.


That noted, one issue that often impacts performance is fragmentation of packets. Ideally, hosts will detect the fragmentation and reduce their packet sizes, but it's better if it doesn't occur to begin with.


This Cisco White Paper will discuss the issue at length: http://www.cisco.com/warp/public/105/pmtud_ipfrag.html


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