MONITORING remote hosts with 128 line -->> giving UNKNOWN states..most of the time..

[Tharanga]

Hi all,

i configured nagios and evrything is workig fine. but when i tried to monitor remote hosts in the WAN link...it gives lot of no response errors. and all the processes coming to "unknown" state. iam using snmp to check some process, hard disk..stuff...iam not using NRPE. we have a 128 line.
some times ping process diplayes RTA = 1400...5000 ms . UDP is connectionloess and i think snmp packets are droppping somewhere. sometimes it gives correct out put....with ok states..critical..and real values like hard dik space...memory usage...via snmo..
how do i improve my monitoring process...
hope u guys can help... me to solve this...is there any way to fine tune the nagios polling...?? 
( in my checkcommands i used TIMEOUT value with a high threshold but didnt work......).

thaks in advance
Tharanga
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