snmpget command not working

HI to all Unix gurus and Lovers,

 I am having one snmpd problem somewhat strange.

 When I execute 'snmpget -v2c -c public <local_ip> system.sysDescr.0'

 initially 4-5 times it executes properly,But after that it gives a message of

'Timeout: No Response from 192.168.1.88.' again and again.

 After restarting daemon 4-5 times again command executes properly for 

4-5 times and again it gave me an 'timeout'.

Above problem happens in my all computers in the LAN.

There is no any cron or firewall configured. Please try to solve the

problem....

Regards
JAGDISH