named error messages in log file, how to fix?

[Mark.Andrews at nominum.com]

> > 
> > > Jun 24 15:46:22 luna named[605]: client 192.168.1.61#137:
> > > error sending response: host unreachable
> > 
> > 	You machine does not have a route to 192.168.1.61.
> 
> Your guess sounds logical, but not observed as the fact.

	Well then ipchains, or similar, is blocking packets to
	port 137 on 192.168.1.61.

> 
> The fact is, I can get ping reply from 
> Linux(192.168.1.254 running bind) to Win98(192.168.1.61). 
> 
> >From Linux box: 
> #ping 192.168.1.61
> PING 192.168.1.61 (192.168.1.61) from 192.168.1.254 : 56(84) bytes of data.
> 64 bytes from 192.168.1.61: icmp_seq=0 ttl=128 time=28.988 msec
> 64 bytes from 192.168.1.61: icmp_seq=1 ttl=128 time=16.751 msec
> 64 bytes from 192.168.1.61: icmp_seq=2 ttl=128 time=6.784 msec
> 
> Ping from Linux to Win98, result seems always been consistant.
> -----------------------------------------------------------
> And vise versa, from Win98 box:
> 
> C:\WINDOWS\Desktop>ping 192.168.1.254
> Pinging 192.168.1.254 with 32 bytes of data:
> Reply from 192.168.1.254: bytes=32 time=2ms TTL=255
> Reply from 192.168.1.254: bytes=32 time=2ms TTL=255
> Reply from 192.168.1.254: bytes=32 time=2ms TTL=255
> Reply from 192.168.1.254: bytes=32 time=2ms TTL=255
> 
> Ping statistics for 192.168.1.254:
>     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
> Approximate round trip times in milli-seconds:
>     Minimum = 2ms, Maximum =  2ms, Average =  2ms
> -----------------------------------------------------------
> But I noticed result may not 100% consistant ping
> from Win98 to Linux box, accasionaly, especially after
> some period of inactivity, it seems I got some packet 
> loss when pinging from Win98 to RH7.1. That's could
> be the reason errors in the log.
> Pinging 192.168.1.254 with 32 bytes of data:
> 
> Reply from 192.168.1.254: bytes=32 time=5ms TTL=255
> Reply from 192.168.1.254: Destination port unreachable.
> Reply from 192.168.1.254: Destination port unreachable.
> Reply from 192.168.1.254: Destination port unreachable.
> 
> Ping statistics for 192.168.1.254:
>     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
>     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Approximate round trip times in milli-seconds:
>     Minimum = 5ms, Maximum =  5ms, Average =  1ms
> 
> Isn't that strange? 3 out of 4 packets were unreachable as above,
> but Win98 still reports 0% loss? 
> What could cause such 'unreachable'? I have two Cisco switch
> and one Farolon hub, switch/hub configuration problem? 
> sorry for posting wrong place if this turns out not a dns issue.
> thanks.
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com