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Old 08-14-2004, 12:51 AM   #1
Registered: Aug 2004
Posts: 88

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trying to ssh from home

We have some servers at a co-location facility, and one of them is now a Linux box (yippeeeee!) running Red Hat 8. I was thrilled when I figured out how to start sshd running on it today, and from a nearby Win2K server on the same private network (behind the same router and firewall) I can ssh into it using Putty and the machine's public IP address. I got home and tried getting into it from my XP box but it says Connection refused. Actually, I also got into it from the XP box when I had it plugged into that same internal network earlier today. So why can't I hit it now? Like I said, I've always been ssh'ing using the public address, not the private one, so I was thinking it must be going out over the net and coming back to it.

We had opened a ticket with our small ISP to have one of their guys open up port 22 on our router, but I don't know if that got done or not, and I don't know enough to figure out whether or not it's open other than to try to use it! But if the firewall is still shutting down traffic on that port, how was the Win2K machine able to ssh using a public IP address to a machine behind that firewall? Is it possible that our router is caching that public IP address or something like that and just redirecting it straight-away to the Linux box so that it doesn't really have to go out over the net?

Old 08-14-2004, 12:57 AM   #2
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Registered: Oct 2003
Location: Zurich, Switzerland
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Using public ip doesn't force the packages to any further than to first gateway that is aware of the network layout, so it is quite probable that the packages actually stayed in lan behind the firewall when you used the box from the office.


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