Connection Problem

35 pts.
Network connectivity
A colleague of mine works at another branch about 30 km away from mine, and every once in a while he submits data to a server located at my branch, however it takes a long time to establish the connection and even longer to submit (around 20 mins) .. suggestions? n.b the connection speed for the leased line is 128 kb/s should i upgrade the speed of the connection or change the connection lines?

Answer Wiki

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There are a range of possibilities here. The best course of action would be to determine what is happening during the times when it takes a long time to establish a connection and transfer data from the branch office. There may be line quality or utilization conditions that are causing the degraded performance. For example, performing a PING when this occurs would reveal if there were any packet loss or latency issues. You can also request that the circuit provider monitor the line to assist with troubleshooting.

Is it always the same type and amount of data being transferred or does it vary? The reason I ask is because if it is the same type and amount of data all, or most of the time and the issue is sporadic then there probably isn’t anything wrong with the circuit in general.


Did this ever work “quickly”? There could be a lot of database chatter as some (most) client/server applications are not made to work across a link smaller than a typical LAN link. 128k is definitely a small link size these days. Can the data be compressed before moving across the wire and then uncompressed on the other side? Pings will show you how quick the round trip time is between the sites but data transfer rates may be different due to window sizing and acks, etc. Try a ping with large packets – ping xx.xx.xx.xx -l 1300 -n 100 . This will ping a remote host with 100 – 1300 byte packets. This will help you see if the link is capable of handling large packets. You can change the numbers as needed. As Wrobinson suggests, there may be other traffic already on this link that this upload saturates the capacity. You need to understand how busy the circuit is before adding additional capacity.

Discuss This Question: 4  Replies

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  • Emodante
    the data varies as he's submitting data into a database, however if the connection was to prove problomatic would it be better to upgrade my connection speed or change my connection lines?
    35 pointsBadges:
  • Schmidtw
    how exactly is he connected? what types of authentication are required for the data to be sent/submitted and accepted? have you checked either of the firewall settings for reasons this data might be stopped or slowed? -Schmidtw
    11,330 pointsBadges:
  • Emodante
    the connection is a leased line between me and him i've checked both firewalls and the problem doesn't lie there however the data is slow almost EVERYTIME regardless of size (surely the bigger they are the slower they get)
    35 pointsBadges:
  • Labnuke99
    What are the results of your ping testing using large number of large packets? What is the latency? We cannot really make valid suggestions without understanding more about the network environment.
    32,960 pointsBadges:

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