Accurate measurement of network bandwidth is crucial for many Internet applications and protocols. Existing band-width measurement tools such as Pathchar

Bing and Bprobe assume symmetric links. However

ADSL lines

cable modems and satellite links are popularly used

and it becomes necessary to consider asymmetric links. This paper presents a new algorithm called ALBMA (Asymmetric Link Bandwidth Measuremern Algorithm) to measure each hop's link bandwidth in both directions in an IP network

and uses the kernel density estimator algorithm to filter out measurement noise. Simulations validate ALBMA and filtering method. Compared with previous algorithms

ALBMA has alinost the same accuracy

but with higher measuring speed and lower network resource Cost.