bandwidth estimation
- pathchar
- bandwidth estimation by round-trip time
- algorithm
- per hop measurement by TTL (as traceroute does)
- repeated measurement with varying packet size
- pick up minimum round-trip time for each packet size
- linear regression to obtain propagation delay and bandwidth
- limitations
- many measurements required
- accumulation of errors
- especially narrow link behind fat link
- only one-way
- open-source pathchar clone: pchar, clink
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