network configuration

[youtan]

I can't ping the gateway. I've configured the following files...

/etc/hosts
/etc/resolv.conf
/etc/nsswitch.conf
/etc/defaultrouter
/etc/netmasks
....

In fact, I have two machines. One is able to ping the gateway, one is not. I've even tried copying these files from one system to the other. No go...

Ideas?

 

[bi]

Sorry to ask the obvious question, but it happened to me once when I couldn't ping the gateway: are you sure the network cable is connected? (Boy, was I embarassed.)

Also, is the network card OK? Is the cable connected to a hot network connection?

Have you tried using sys-uncofig rather than editing all the files manually?

 

[youtan]

Yes, my network cable is connected to a hub. The lights flicker on the hub when I attempt a ping, so I'm assuming the ethernet card is functional.

I ran sys-unconfig... still no connection to the outside world. (I added the /etc/defaultrouter file)

Any more ideas?

 

[Serbtastic]

Try pinging your own IP address, and also the loopback address (127.0.0.1) and post results.

 

[youtan]

When I ping my own IP address - IP is active. Loopback - IP is active. Local systems - active.

When I ping the GW, I don't get a message return - instead just an infinite wait....

 

[tconn]

Off topic question: What good ever comes from pinging a local loopback address or a local interface address ? The packet isn't going to go up and back down the same wire... So whats the point ? All you are proving is that the interface is up. Right ?

 

[predamarcel]

can you show us the output of:
# netstat -r -n
command ?
on both machines


PM


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[youtan]

results of netstat -r -n

In general they are both identical except for different IP addresses and the numbers listed under Use. I included both numbers as not working/working.

destination gateway flags Ref Use Interface
same IP U 3 45/37 hme0
same IP U 3 0/0 hme0
same GW UG 0 117/144
same LB UH 0 26962/8403 lo0

 

[predamarcel]

so,
you cann't )

PM

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___

 

[rnelso26]

I had a similar problem once, you might check these. Is the IP address valid for the subnet your on? Also, check that there is not a duplicate IP address in you NIS maps.

 

[youtan]

I've already checked with my DNS server (I'm at a large university) - my IP's are valid on both machines. I could try a differenct IP address, just to double check... I'm not using NIS.

 

[predamarcel]

try :
traceroute -n GATEWAY_IP's

what it said ?


__

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___

 

[youtan]

traceroute -n ###.###.##.240

on working machine:

traceroute to ###.###.##.240, 30 hops max, 40 byte packets
1 * * *
2 ###.###.##.254 0.583 ms * *

on non-working machine:

traceroute to ###.###.##.240, 30 hops max, 40 byte packets
1 ###.###.##.253 0.645 ms !X * 0.486 ms !X

 

[youtan]

I'm connected! Thanks to all for the help!

As usual - a stupid mistake.... When I ran the sys-unconfig to change the IP and hostname, on bootup there were errors associated with the hostname/IP match. Then I remembered that I'd copied the /etc/hosts file from one machine to the other - by replacing it completely (and then modifying the IP, hostname, etc..). However, by doing so I'd made a mismatch of the /etc/inet/hosts file with the /etc/hosts file. I copied it again into /etc/inet and now I can ping the gateway.