network issue
Min Chien Lim
chien_1 at yahoo.com
Fri Oct 8 01:27:36 UTC 2004
Min Chien Lim wrote:
>>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.
>
> It looks like
>
> -bash-2.05b# netstat -rn
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window
> irtt Iface
> 129.146.210.0 0.0.0.0 255.255.255.0 U 0 0
> 0 eth0
> 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0
> 0 eth0
> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0
> 0 lo
> 0.0.0.0 129.146.210.250 0.0.0.0 UG 0 0
> 0 eth0
You can send packets to 129.146.210.* because your are directly
connected to
that network.
Packets for anywhere else go to your router at 129.146.210.250 so
you'd need
to check out the netmasks and routing tables on that router to find
out what
was happening.
(I'm assuming that "/sbin/ifconfig eth0" on your machine would show
an IP
address somewhere in 129.146.210.* and a netmask of 255.255.255.0).
Paul.
----------------------------------------------
The problem may not pertain to the routing table. I cannot
ping/telnet to the hostname but I can ping/telnet to the IP address.
And ypmatch returns the correct results. Ping/telnet to the hostname
results in a "unknown host ..."
Min Chien
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