Destination Host Unreachable

[goude]

Hello everyone,

I have been working as a junior systems engineer for a month now. My supervisor left the company and I'm freaking out. I'm pretty much on my own now (god knows for how long) and I really need some help.
We got here a few render boxes. Unfortunately, one of them is not responding. Whenever I ping it, I get the following output:

PING renderbox007 (10.0.0.185) 56(84) bytes of data.
From camembert (10.0.0.174): icmp_seq=1 Destination Host Unreachable
From camembert (10.0.0.174) icmp_seq=1 Destination Host Unreachable
From camembert (10.0.0.174) icmp_seq=2 Destination Host Unreachable
From camembert (10.0.0.174) icmp_seq=3 Destination Host Unreachable
From camembert (10.0.0.174) icmp_seq=4 Destination Host Unreachable
From camembert (10.0.0.174) icmp_seq=5 Destination Host Unreachable
From camembert (10.0.0.174) icmp_seq=6 Destination Host Unreachable

I have restart the machine quite a few times but nothing changed.

Can somebody help me, please?

Thank you in advance!!!

[sdousley]

This looks to be more a routing issue than a problem with the box since you are pinging "renderbox007" and getting the destination host unreachable from "camembert". Are your computer and the renderbox007 on the same IP range? Or does it have to go through routing to get there. Maybe try pinging the renderbox007 from another rendering machine (assuming they're on the same ip range)

[goude]

I think they are. What do you mean exaclty "the same IP range"?

Renderbox = 10.0.0.174
My machine "camembert" =10.0.0.185

The render box is connected to a switch and every machine can access it through the switch.

Also, if I type arp I can get the MAC (HW)address of every machine.

For renderbox7, its says: incomplete

[sdousley]

Ah, right, they are on the same range then! Can most/all of the other boxes ping renderbox007 alright, and how about pinging the machine you have trouble pinging from? Can others ping that machine ok?

[goude]

Hello sdousley,

Sorry for my late reply.
None of any other machines can ping renderbox007.
Yes other machines can ping my machine, no problem.

Any more suggestions?

Thank you very much

[Foolse]

Hi!

I am not an expert but still...
Here are some suggestions (which you probably already checked!)

Do the machines use the same netmask?
Are the ports for ping closed?
Do you use IPtables or some other firewall?

Best,
/Ove

[goude]

Hi foolse,

thank you for your reply.

Do the machines use the same netmask?
Yes

Are the ports for ping closed?
I don't know, can you please tell me how can I check that?

Do you use IPtables or some other firewall?
I think IPtables

[Foolse]

Try the command:

iptables -L

and supply the result (if you get one )

if not try a portscan on the machine either from the troublesome one or from another (LINUX) machine...

and by the way have you checked netstat?

Best
/Ove

[goude]

Hi foolse,

Here is the output of iptables -L:

Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

I have no idea what that means.

[Foolse]

That means you do not have any IPtables rules running.
maybe you are using Ipchains?

What kernel are you using?

 uname -rvo

how are the routing done

 route

and could you please post the result from

 ifconfig -a

You could check the open ports as well, either with the graphical tool of your choice or by using ie nmap, I am not very good with nmap but I would try something like:

 nmap -sT localhost

and

nmap -sT #the ip adress of your machine#

do the nmap both from "camembert" and from outside of it.

Good luck!
/Ove