nagios gives unknown state - when monitoring over WAN link

[Tharanga]

Hi all,

Iam using nagios to monitor 3 servers in a different country. we have a 128 line. but that line is use for various activities..like ftp etc..
when i try to monitor remote hosts (out side my country) from my nagios server it gives state unknown and cant connect to remote hosts,timeouts. after few seconds it gives correct out put (i am using snmp to check hard disk,memory..etc). normally my round trip average time is more than 500 ms some times its 900ms. i think udp packets get lost . 
if i use NRPE can i solve this problem ?? i cant give priority to icmp or udp in my network.
is nagios use that much bandwidth for monitoring ?? (iam monitoring only 3 servers and and alltogeter executing 10 snmp plugins)
when i use this in my LAN it gives no errors..and gives real data...it indicates that my configuaration is ok...when i go over WAN link it gives only amber colour and after few seconds it gives ok state..again in few seconds it gives amber...so..i cant monitor it well..coninuosly
hope u guys can help me to solve this...iam using nagios 1.2.
i thought to use NRPE ? is this will give a better result over WAN ???

thanks in advance
Tharanga
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