My system has no problems accessing (telnet/pinging) systems with 129.146.210.xxx or 129.146.xxx.xxx IP addresses but when the IP looks like 129.xxx (something other than 146) .xxx.xxx, it cannot ping/telnet to it. Doing a ypmatch on 129.xxx.xxx.xxx has no problems. Any clues?
What does your routing table look like?
netstat -rn
Paul.