Boggling network problems - anyone a master network troubleshooter?
I have a very strange problem occuring on our company's internal network. If anyone can give me ideas as to why this is happening, I would officially proclaim you a demi-god.
What I want:
to have regular access from my Redhat Linux 9 machine @ 220.127.116.11 to another Redhat Linux 9 machine @ 10.5.220.4
This isn't happening. Instead, the connection is very intermittent. It will be fine for a while, but after about 2 or 3 minutes of inactivity, it dies. At one moment, I can ping it and it responds in < 2 ms. However, after a while, I will ping it, and it won't respond for 3-10 minutes! It will then begin responding normally (< 2 ms) again.
What could be going on? Here is the network topology-
18.104.22.168 ---> eth switch ---> 22.214.171.124[cisco router]10.5.1.40 ---> switch/hub --->10.5.220.40
Unfortunately, all the equipment after the router is managed by our MIS department, and I am not sure how it is all configured.
126.96.36.199 (HPUX 11.11) can ping 10.5.220.40 anytime without trouble, and it doesn't even have an active connection (I have an NFS connection between the two Linux machines)
188.8.131.52 (HPUX) can ping 10.5.220.40 anytime.
184.108.40.206 (WinNT) can ping 10.5.220.40 anytime.
They can ping back. 10.5.220.40 can ping them, but not the linux machine (89.28)
Other machines on the 10.5.x.x network that the Linux machine can't ping, but others can:
10.5.1.5 (our router to the outside world)
10.5.1.8 (our DNS server)
More strange stuff:
The Linux machine can ping 10.5.1.249 anytime and get a reply, while at the same time not getting a reply from the others mentioned above. As far as I know, they are on the same network (all the machines there have subnet mask 255.255.0.0)
So, the final question:
How come I can see some machines and not others right next to it?
Our router doesn't seem to be a problem, as other machines on our side can see anyone on the other side.
Ideas? Suggestions? Do you want more info?
Last edited by drgowans; 09-19-2003 at 12:23 PM.