I imagine this is very simple to fix but I am not sure where to look.

From a graphical console I can ping a connected computer, whether logged on as user mythtv or root.
However when I ctrl-alt-F1(or F2, F3 etc) to a text console all pings time out.
If I start pinging from the text console then switch to the graphic console for a few seconds, then switch back to the text console, I find that pinging was successful while switched to the graphic console, but starts timing out once back in text.
I can also ping successfully from a shell inside the graphic console.

I am running R5A16, with no firewall I believe.
Is this an iptables issue? I can't find any network configuration that changes when I switch runlevel.

Thanks

That is indeed a very odd issue I've never heard of it. doing ctrl+alt+F2 does not change runlevels. actually id doesn't change anything at all other than you are using a console terminal instead of an X terminal Maybe one of the old unix heads around here have heard of this, but I've been using linux for close to 10 years, and I've never heard of it.

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Xsecrets

At a guess the difference is that he's logged in as two seperate users. The mythtv user in the xterm, and root in the consoles. Try doing an "su -" in the xterm and seeing if your results change. If it does, you probably have some kind of permissions or path problem... Make sure to use "su -" and not just "su"!