RTT Question

Unanswered Question
Dec 16th, 2007

Hai frenz,

Can somebody explain about RTT, how do u define the connection slow or normal? when do the ping test how can the output help us. Please do help me...i need to know how this can help in testing my internet line ok or not. TQ

I have this problem too.
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bvsnarayana03 Sun, 12/16/2007 - 22:31

RTT is the time taken by the icmp pkt to travel from src to dst & then back to src. Though I have never come across any specific values that has been defined as good, slow or bad connectivity. But from experience I can say that for LAN it is <1ms, for longer distances over ethernet <10ms, for WAN/serial links it is 30-60ms, for MPLS networks it is ~300ms. FOr internet, <350ms is a good value.Pls note that these are neither the ideal values nor are defined in any books.

also note that at times ISP has a SLA with customer based on the RTT values. for example, over MPLS a customer may have contracted an SLA of 500ms with ISP, so it may vary based on the ISP n/w, congestion on the link, errors, distance, type of media etc.

hope that clarifies.

pls rate all helpful posts.

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