network issue

Paul Howarth paul at city-fan.org
Thu Oct 7 15:02:05 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.




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