hi, i am a fresh man on mib,and now i want to demand the MAC address of a special IP address by at group.unfortunately, i don't know what OID i should use.for example,i want to demand the MAC address of 192.168.0.1,so i use 1.3.6.1.2.1.3.1.1.2.192.168.0.1,but it response NULL and don't work.how can i do it? thanks a lot. yi zhang zhangyi at fmmu.edu.cn 2005-10-19